WO2023210822A1 - 圧延表面処理鋼板の製造方法及び圧延表面処理鋼板 - Google Patents
圧延表面処理鋼板の製造方法及び圧延表面処理鋼板 Download PDFInfo
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- WO2023210822A1 WO2023210822A1 PCT/JP2023/016948 JP2023016948W WO2023210822A1 WO 2023210822 A1 WO2023210822 A1 WO 2023210822A1 JP 2023016948 W JP2023016948 W JP 2023016948W WO 2023210822 A1 WO2023210822 A1 WO 2023210822A1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
Definitions
- the present invention relates to a method for manufacturing a rolled surface-treated steel sheet and a rolled surface-treated steel sheet.
- nickel-plated steel foil has been known as a material for members constituting batteries and components constituting electronic-related equipment.
- a diffusion alloy layer containing nickel and iron is formed on the steel plate, and the texture of the diffusion alloy layer is further controlled.
- a method has been adopted in which a nickel-plated steel sheet is subjected to cold rolling at a high reduction rate to obtain a nickel-plated steel foil.
- Patent Document 1 discloses that a steel plate with nickel plating is annealed to cause Ni in the plating and Fe in the steel plate to interdiffuse, and then cold rolled at a cumulative reduction rate of 70% or more to reduce the thickness to 100 ⁇ m or less.
- the present disclosure discloses a method for producing steel foil in which a specific texture is formed on the surface layer.
- Steel foil obtained not only by the above manufacturing method but also by conventional manufacturing methods has the following problems.
- the plating layer portion cracks due to elongation, exposing the base iron, and causing highly corrosive, for example alkaline, There was a concern that it would elute into the electrolyte.
- the foil is passed between sheet rolls multiple times on the production line, and there has been a need for a steel foil that can prevent damage to the foil surface during this process.
- the present invention has been made in view of solving the above problems, and it is possible to suppress the occurrence of cracks even when elongated while maintaining the hardness of the surface, and to suppress the occurrence of cracks in the drawing roll. It is an object of the present invention to provide a method for manufacturing a rolled surface-treated steel sheet that improves the threadability when the steel sheet is passed between rollers and rolling rolls.
- the method for manufacturing a rolled surface-treated steel sheet in this embodiment includes (1) an iron-nickel alloy layer forming step of forming an iron-nickel alloy layer on a steel sheet serving as a base material; After the step, there is a rolling step of rolling the steel plate having the iron-nickel alloy layer at a reduction rate of 5 to 25%.
- the iron-nickel alloy layer forming step includes a nickel plating step of forming a nickel plating layer on the steel plate serving as the base material, and a heat treatment on the nickel-plated material obtained in the nickel plating step.
- the method preferably includes a heat treatment step of applying and diffusing the iron-nickel alloy layer to form the iron-nickel alloy layer.
- the rolled surface-treated steel sheet in this embodiment includes (3) a base material made of steel, and an iron-nickel alloy layer provided on the base material,
- the layer contains Fe 1 Ni 1 , has an orientation index of 0.7 or more in X-ray diffraction of the (200) plane of Fe 1 Ni 1 , and has an orientation index of 0.7 or more in the X-ray diffraction of the (220) plane of Fe 1 Ni 1 . It is characterized by an orientation index of 0.7 or more and less than 2.5.
- the average crystal grain size of nickel obtained by EBSD measurement on the surface of the iron-nickel alloy layer is 0.4 ⁇ m to 1.1 ⁇ m.
- the difference (absolute value ) between the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 and the orientation index in X-ray diffraction of the (220) plane ) is preferably 1.0 or less.
- the orientation index of the (111) plane of the Fe 1 Ni 1 in X-ray diffraction is 0.3 to 2.0.
- the present invention it is possible to provide a method for manufacturing a rolled surface-treated steel sheet, which suppresses the occurrence of cracks even in a state where elongation is applied while maintaining hardness, and improves threadability.
- FIG. 1 is a flowchart showing a method for manufacturing a rolled surface-treated steel sheet according to the present embodiment.
- FIG. 2 is a schematic diagram showing a method for measuring hydrogen permeation current density of a rolled surface-treated steel sheet according to the present embodiment.
- FIG. 2 is a schematic diagram showing a method for measuring hydrogen permeation current density of a rolled surface-treated steel sheet according to the present embodiment.
- FIG. 2 is a schematic diagram showing a method for measuring hydrogen permeation current density of a rolled surface-treated steel sheet according to the present embodiment.
- FIG. 1 is a schematic diagram showing a cross section of a rolled surface-treated steel sheet of the present embodiment.
- FIG. 2 is a schematic diagram showing how to determine the thickness of an iron-nickel alloy layer included in the rolled surface-treated steel sheet of the present embodiment. It is a schematic diagram which shows the cross section of the rolled surface-treated steel plate in the modification of this embodiment.
- the method for manufacturing a rolled surface-treated steel sheet of the present embodiment includes an iron-nickel alloy layer forming step of forming an iron-nickel alloy layer on a steel sheet (original sheet) serving as a base material, and After the layer forming step, the method includes a rolling step of rolling the steel plate having the iron-nickel alloy layer at a reduction rate of 5 to 25%.
- the original plate herein refers to a portion of steel that will become a base material on which an iron-nickel alloy layer will be formed in the iron-nickel alloy layer forming step described later.
- the original plate is preferably made of low carbon steel or extremely low carbon steel.
- a low carbon hot rolled steel plate (hot coil) of about 2.0 mm to 3.0 mm is descaled by a known pickling method.
- rolling is performed using a known cold rolling method at a reduction rate of 60% or more to obtain a cold rolled steel plate with a thickness of about 0.16 mm to 1.2 mm, and then subjected to known continuous annealing to remove work hardening and soften it. I do.
- intermediate rolling makes it possible to obtain an original sheet with a desired thickness. Note that the preliminary steps for obtaining the original plate are not limited to those described above.
- the thickness of the original plate is not particularly limited and is in the range of 0.03 mm to 0.8 mm.
- the thickness is preferably 30 ⁇ m to 190 ⁇ m.
- an iron-nickel alloy layer is formed on the original plate (iron-nickel alloy layer forming step), and then the steel plate having the iron-nickel alloy layer is rolled down.
- rolling step By rolling at a rate of 5 to 25% (rolling step), it is possible to manufacture the rolled surface-treated steel sheet of this embodiment.
- ⁇ Iron-nickel alloy layer formation process As the iron-nickel alloy layer forming process of this embodiment, a nickel plating layer is formed on a steel plate as a base material (nickel plating process), and then the nickel plating material obtained in the nickel plating process is heat treated and diffused. A method of forming an iron-nickel alloy layer (heat treatment step) can be mentioned.
- Nickel plating bath (Watt bath) and plating conditions]
- ⁇ Bath composition Nickel sulfate hexahydrate: 200-300g/L Nickel chloride hexahydrate: 20-60g/L Boric acid: 10-50g/L Bath temperature: 40-70°C pH: 3.0-5.0
- Stirring Air stirring or jet stirring Current density: 5 to 30 A/dm 2
- a known nickel sulfamate bath or citric acid bath may be used.
- additives such as known brighteners may be added to the plating bath to produce bright nickel plating or semi-bright nickel plating, but in order to avoid hardening of the nickel film, matte nickel plating that does not contain sulfur-containing brighteners is possible. Nickel plating or semi-bright nickel plating is preferred.
- the amount of nickel deposited in the nickel plating layer or iron-nickel alloy plating layer formed on the steel sheet is determined from the viewpoint of cost and electrolyte resistance of the rolled surface-treated steel sheet obtained.
- the amount per side is preferably 0.89 g/m 2 to 28.1 g/m 2 , more preferably 0.93 g/m 2 to 26.7 g/m 2 .
- Heat treatment process Regarding the heat treatment process in this embodiment, heat is applied to the nickel layer formed on the original plate to cause the iron of the original plate and nickel of the nickel layer to interdiffuse, and to form an iron-nickel alloy layer by thermal diffusion.
- the heat treatment step of this embodiment may be continuous annealing or batch annealing (box annealing).
- Continuous annealing is preferably carried out at a temperature and time of 650° C. to 950° C. and a soaking time of 15 seconds to 150 seconds. If the temperature is lower than this or the time is shorter than this, there is a possibility that a sufficient iron-nickel alloy layer 30 cannot be obtained, which is not preferable. On the other hand, heat treatment at a higher temperature or for a longer time than the above-mentioned range is not preferable because the mechanical properties of the base material, such as steel foil, will change significantly, resulting in a significant decrease in strength, or from a cost perspective.
- An example of temperature and time for batch annealing is 450°C to 690°C with a soaking time of 1.5 to 20 hours, and a total time of heating, soaking, and cooling times. It is preferable to carry out the treatment within the range of 4 hours to 80 hours. If the temperature is lower than this or the time is shorter than this, there is a possibility that a sufficient iron-nickel alloy layer 30 cannot be obtained, which is not preferable. On the other hand, if the heat treatment is performed at a higher temperature or for a longer time than the above-mentioned range, the mechanical properties of the base material, such as steel foil, may change significantly, resulting in a significant decrease in strength, or from a cost perspective. Undesirable.
- the rolling process in this embodiment is a process of cold rolling the steel plate on which the iron-nickel alloy layer has been formed after passing through the iron-nickel alloy layer forming process. This rolling process is performed to obtain the desired thickness of the rolled surface-treated steel sheet, to control the metal crystals contained in the iron-nickel alloy layer to a favorable state, and to improve the cracking resistance of the resulting rolled surface-treated steel sheet.
- the purpose is to improve sexuality, etc.
- the rolling reduction rate in the rolling process of this embodiment is characterized by being 5 to 25%.
- the orientation of both the (200) plane and the (220) plane can be properly adjusted to the crystal grains of the iron-nickel alloy (Fe 1 Ni 1 ) contained in the iron-nickel alloy layer. It is thought that a mixed state can be created.
- the orientation index in X-ray diffraction (XRD) is changed to the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 (hereinafter also referred to as the orientation index of the (200) plane).
- the orientation index in X-ray diffraction of the (220) plane of Fe 1 Ni 1 (hereinafter also referred to as the orientation index of the (220) plane) is 0.7 or more and less than 2.5. It is preferable. Furthermore, the difference (absolute value) between the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 and the orientation index in X-ray diffraction of the (220) plane of Fe 1 Ni 1 may be 1.0 or less. preferable.
- the rolling process of this implementation process improves the cracking resistance while maintaining the appropriate surface hardness of the obtained rolled surface-treated steel sheet by controlling the crystalline state of the iron-nickel alloy as described above. is considered possible.
- the upper limit of the rolling reduction in the rolling process is 25%.
- the average crystal grain size of nickel is set to 0.4 ⁇ m to 1.1 ⁇ m according to electron beam backscatter diffraction (EBSD) measurement data by the rolling process of the present embodiment.
- EBSD electron beam backscatter diffraction
- the average crystal grain size measured by electron beam backscatter diffraction (EBSD) can be obtained using a known measuring device and measuring program.
- the average crystal grain size can be obtained by obtaining and analyzing information on a diffraction pattern called a Kikuchi pattern under the following conditions.
- the average crystal grain of nickel based on the EBSD measurement data in the present invention
- the diameter is the average crystal grain size of nickel crystals, iron-nickel alloy crystals, or nickel crystals and iron-nickel alloy crystals.
- the crystal orientation of the nickel alloy is moderately adjusted to both the (200) plane and the (220) plane.
- the average crystal grain size of nickel can be controlled in the range of 0.4 ⁇ m to 1.1 ⁇ m based on the EBSD measurement data as described above by making the nickel exist in the nickel and applying processing strain. It is considered that by setting the average grain size within this range, it is possible to suppress an increase in the coefficient of friction on the surface of the resulting rolled surface-treated steel sheet. Furthermore, it is considered possible to set the hardness of the outermost surface of the resulting rolled surface-treated steel sheet and the intermediate layer between the base material and the outermost surface within an appropriate range.
- the number of rolling rolls that act in the rolling process of this embodiment may be one set or multiple sets.
- a rolling mill is usually constructed by combining a plurality of upper and lower rolls that directly act to thin the sheet, that is, rolling rolls, and rolls for threading the sheet. During rolling, a single set of rolling rolls may act, or a plurality of rolling rolls may act.
- the number of rolling rolls that act in the rolling process may be one set or multiple sets, or, for example, three sets of rolling rolls may be passed through twice for a total of six sets of rolling rolls. good. Generally, as the number of passes through the rolling rolls increases, problems due to work hardening tend to occur during rolling.
- the number of rolling rolls acting on the rolling is 6 or less, more preferably 3 or less, and the number may be 2 or 1.
- one set of rolling rolls herein refers to the upper and lower rolls that directly touch the plate and whose thickness changes before and after the rolls.
- the above-mentioned rolling reduction ratio refers to the rolling reduction ratio obtained from the thickness of the plate before and after the rolling process. In other words, when the sheet is passed through three sets of rolling rolls twice, the rolling reduction is determined from the thickness before the first passing and the thickness after the second passing.
- the rolling reduction ratio is more preferably 10 to 20% from the viewpoint of improving the cracking resistance and threadability of the rolled surface-treated steel foil.
- the rolling reduction rate by the first set of rolling rolls is not particularly limited.
- a rolled surface-treated steel sheet After the rolling process, a rolled surface-treated steel sheet can be obtained.
- the amount of nickel deposited on the obtained rolled surface-treated steel sheet is preferably 0.89 g/m 2 to 26.7 g/m 2 per side.
- the rolled surface-treated steel sheet 1 of this embodiment includes a base material 20 made of steel, and an iron-nickel alloy layer 30 provided on the base material 20.
- the base material 20 constituting the rolled surface-treated steel sheet 1 of this embodiment is preferably an iron-based steel sheet containing less than 1.0% by weight of Cr and other additional metal elements.
- low carbon steel represented by low carbon aluminum killed steel (carbon content 0.01 to 0.15% by weight), ultra-low carbon steel with carbon content less than 0.01% by weight, or ultra-low carbon steel A non-aging ultra-low carbon steel made by adding Ti, Nb, etc. to the steel is preferably used.
- the thickness of the base material 20 constituting the rolled surface-treated steel sheet 1 of this embodiment is preferably in the range of 0.03 mm to 0.8 mm, and more preferably in the range of 0.03 mm to 0.15 mm.
- the thickness of the base material 20 is suitably measured by cross-sectional observation using an optical microscope or a scanning electron microscope (SEM).
- the iron-nickel alloy layer 30 included in the rolled surface-treated steel sheet 1 of the present embodiment is an alloy layer containing iron (Fe) and nickel (Ni), and is an alloy consisting of iron and nickel ("iron-nickel alloy", " This is a metal layer containing a Fe--Ni alloy (also referred to as "Fe--Ni alloy”).
- the state of the alloy consisting of iron and nickel may be any of a solid solution, eutectoid/eutectic, and compound (intermetallic compound), or they may coexist.
- the iron-nickel alloy layer 30 included in the rolled surface-treated steel sheet 1 of this embodiment may contain other metal elements or unavoidable impurities as long as the problems of the present invention can be solved.
- the iron-nickel alloy layer 30 may contain metal elements such as cobalt (Co) and molybdenum (Mo), and additive elements such as boron (B).
- the proportion of metal elements other than iron (Fe) and nickel (Ni) in the iron-nickel alloy layer 30 is preferably 10% by weight or less, more preferably 5% by weight or less, and still more preferably 1% by weight or less. preferable. Since the iron-nickel alloy layer 30 may be a binary alloy consisting essentially only of iron and nickel, the lower limit of the content ratio of other metal elements excluding unavoidable impurities is 0%.
- the type and amount of other metal elements contained can be measured by known means such as an X-ray fluorescence (XRF) measurement device or GDS (glow discharge emission surface analysis).
- XRF X-ray fluorescence
- GDS low discharge emission surface analysis
- the above-mentioned iron-nickel alloy layer 30 contains Fe 1 Ni 1 , and the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 is 0.7.
- the orientation index in X-ray diffraction of the (220) plane of Fe 1 Ni 1 is 0.7 or more and less than 2.5.
- the difference (absolute value) between the orientation index in the X-ray diffraction of the (200) plane of Fe 1 Ni 1 and the orientation index in the X-ray diffraction of the (220) plane of Fe 1 Ni 1 is 1.0 or less. preferable.
- the above orientation index can be achieved by applying rolling to the iron-nickel alloy layer 30. It is considered that the above-mentioned orientation index makes it possible to improve the cracking resistance and threadability while maintaining the appropriate hardness of the surface of the rolled surface-treated steel sheet 1. Furthermore, by providing a random orientation in which (200) planes and (220) planes are appropriately mixed, it is possible to lengthen the passage (route) of hydrogen between crystals, and it is thought that excellent hydrogen barrier properties are achieved. From the viewpoint of maintaining appropriate hardness, cracking resistance, and improving sheet passability, the orientation index of the (220) plane is preferably 0.7 or more and less than 2.0, more preferably 0.7 or more and less than 1. It is less than 9.
- the upper limit value of the (200) plane is preferably 2.0 or less, more preferably 1.7 or less. Further, from the viewpoint of obtaining more stable sheet threadability, it is more preferable that the difference (absolute value) between the orientation index of the (200) plane and the orientation index of the (220) plane is 0.8 or less, and 0. More preferably, it is .7 or less. Since the orientation index of the (200) plane and the orientation index of the (220) plane may have the same value, the lower limit value of the difference between them is 0.
- Crystal orientation index of X-ray diffraction of ( 200 ) plane of Fe 1 Ni 1 Ico_Fe 1 Ni 1 (200), and crystal orientation index of X-ray diffraction of (220) plane of Fe 1 Ni 1 Ico_Fe 1 Ni 1 (220) was defined and calculated using the following formula.
- the subscript "co” means crystal orientation.
- Ico_Fe 1 Ni 1 (200) [I_Fe 1 Ni 1 (200)/[I_Fe 1 Ni 1 (111)+I_Fe 1 Ni 1 (200)+I_Fe 1 Ni 1 (220)+I_Fe 1 Ni 1 (311)+I_Fe 1 Ni 1 (222)]] / [I S _Fe 1 Ni 1 (200) / [I S _Fe 1 Ni 1 (111) + I S _Fe 1 Ni 1 (200) + I S _Fe 1 Ni 1 (220) + I S _Fe 1 Ni 1 (311) + I S _Fe 1 Ni 1 (222)]]]
- Ico_Fe 1 Ni 1 (220) [I_Fe 1 Ni 1 (220)/[I_Fe 1 Ni 1 (111)+I_Fe 1 Ni 1 (200)+I_Fe 1 Ni 1 (220)+I_Fe 1 Ni 1 (311)+I_Fe 1 Ni 1 (222)]] / [I S _Fe 1 Ni 1 (220) / [I S _Fe 1 Ni 1 (111) + I S _Fe 1 Ni 1 (200) + I S _Fe 1 Ni 1 (220) + I S _Fe 1 Ni 1 (311) + I S _Fe 1 Ni 1 (222)]]]
- the diffraction intensity of each crystal plane of Fe 1 Ni 1 measured by X-ray diffraction is expressed as follows.
- Diffraction intensity of crystal plane I_Fe 1 Ni 1 (220): Fe 1 Ni 1 (220) measured by X-ray diffraction
- the diffraction intensity here refers to the diffraction intensity measured within the range of each diffraction angle (2 ⁇ ) ⁇ 0.11° described in JCPDS (Joint Committee on Powder Diffraction Standards, PDF card number: 01-071-8322). This is the maximum value of intensity (cps). Specifically, the (111) plane is 43.83° ⁇ 0.11°, the (200) plane is 51.05° ⁇ 0.11°, the (220) plane is 75.10 ⁇ 0.11, and the (311 ) plane is 91.23 ⁇ 0.11, and (222) plane is the maximum value in the range of 96.56 ⁇ 0.11.
- the iron-nickel alloy in the iron-nickel alloy layer 30 of the rolled surface-treated steel sheet 1 in this embodiment is Fe 1 Ni 1 (111) calculated in the same manner as above. It is preferable that the plane orientation index is 0.3 to 2.0. Although the details are unknown, it is thought that characteristics can be further improved by having a crystal orientation that is not biased towards the (111) plane in addition to the (200) plane and the (220) plane. More preferably, the orientation index of the Fe 1 Ni 1 (111) plane is 0.3 to 1.3. Further, it is preferable that the orientation index of the Fe 1 Ni 1 (111) plane is 0.3 to 1.0, or that the orientation index of the (111) plane is smaller than that of the (200) plane and the (220) plane.
- the inventors conducted measurements and evaluations, and found that in order to suppress the occurrence of voltage drop (self-discharge) as described above, the rolled surface-treated steel sheet of this embodiment is electrically It was concluded that the hydrogen permeation current density obtained from the chemically measured oxidation current value is preferably 10 ⁇ A/cm 2 or less.
- the measurement conditions for the hydrogen permeation current density in this embodiment are as follows: The temperature of the electrolytic solution is 45°C, and a current of 2.25 A is applied on the hydrogen intrusion side to a measurement area (28.26 cm 2 ) with a measurement diameter of 60 mm. , no current is applied to the hydrogen detection side. The reason why the current value on the hydrogen generation side was set to 2.25 A is to generate a sufficient amount of hydrogen necessary to permeate and move through the rolled surface-treated steel sheet.
- the hydrogen entry side is also referred to as the hydrogen generation side, and is the side on which the hydrogen storage alloy of the bipolar electrode structure is arranged.
- the hydrogen detection side is the opposite side to the hydrogen entry side, and is the positive electrode side of the bipolar electrode structure.
- Each measurement cell was filled with an electrolyte (alkaline aqueous solution containing 6 mol/L of KOH as a main component and having a total concentration of KOH, NaOH, and LiOH of 7 Mol/L), and the counter electrodes (CE1 and CE2) were immersed therein. ing. Platinum (Pt) is used for the counter electrode. Further, the temperature of the electrolytic solution is 45°C. Further, as shown in FIG. 2(b), the measured diameter of the rolled surface-treated steel sheet is ⁇ 60 mm (measured area 28.26 cm 2 ).
- a rectifier For current control on the hydrogen intrusion side, a rectifier is used as shown in FIG. 2(a).
- the rectifier for example, "Compact DC Stabilized Power Supply PMX18-5A” manufactured by Kikusui Electronics Co., Ltd. can be used.
- the current measurement on the hydrogen detection side uses an ammeter as shown in FIG. 2(a).
- the ammeter for example, "Digital Multimeter DT4282” manufactured by Hioki Electric Co., Ltd. can be used. Note that the sample of the rolled surface-treated steel sheet to be evaluated and the connection of each device can be performed as shown in FIG. 2(a).
- the hydrogen permeation current on the hydrogen detection side is measured using the apparatus shown in FIG. It was concluded that a rolled surface-treated steel sheet with a density of 10 ⁇ A/cm 2 or less is suitable for bipolar electrodes from the viewpoint of hydrogen barrier properties. From the viewpoint of further suppressing the voltage drop, it is more preferably 2.5 ⁇ A/cm 2 or less, further preferably 2.0 ⁇ A/cm 2 or less, particularly preferably less than 1.0 ⁇ A/cm 2 .
- the average crystal grain size of nickel according to electron beam backscatter diffraction (EBSD) measurement data is set to 0.4 ⁇ m to 1.1 ⁇ m. is preferred.
- the above average grain size can be achieved by applying rolling to the iron-nickel alloy layer 30.
- the average crystal grain size measured by electron beam backscatter diffraction (EBSD) can be obtained using a known measuring device and measuring program as described above. It is considered that by controlling the average grain size, it is possible to suppress an increase in the coefficient of friction on the surface of the rolled surface-treated steel sheet 1. Further, it is considered possible to set the hardness of the outermost surface of the rolled surface-treated steel sheet 1 and the intermediate layer between the base material and the outermost surface within an appropriate range.
- the surface hardness of the rolled surface-treated steel sheet 1 in this embodiment is 0 to 2.2 ⁇ m from the surface when measured using a micro Vickers hardness tester at a load of 10 g from the viewpoint of cracking resistance and scratch resistance.
- the hardness at depth is 120-230. More preferably 126-230, still more preferably 136-230.
- the hardness at a depth of 2.2 to 4.4 ⁇ m from the surface is preferably 110 to 200, more preferably 120 to 200, when measured under a load of 50 g.
- the friction coefficient in four rounds in a ball-on-disc friction test is 0.4 or less.
- the lower limit of the friction coefficient it is usually 0.05 or more.
- the sum of the friction coefficients at 0.5 lap pitch from 0 to 5 laps (hereinafter referred to as the friction coefficient up to 5 laps) (also referred to as the sum of coefficients) is preferably less than 4.0, more preferably less than 3.5, and still more preferably 3.1 or less. Note that there is no particular lower limit for the total sum of the friction coefficients up to five rounds, but it is usually 0.3 or more.
- the ball-on-disc friction test was conducted in accordance with JIS R 1613:2010 using a chrome steel ball (SUJ2) with a ball diameter of 6 mm as a contact, under the conditions of a rotation radius of 10 mm, a load of 1.0 N, and a motor speed of 10 rpm. , after conducting the test at a rotational speed of 10, the friction coefficient for four revolutions and the sum of the friction coefficients for up to five revolutions can be determined.
- SUJ2 chrome steel ball
- the thickness of the iron-nickel alloy layer 30 included in the rolled surface-treated steel sheet 1 of this embodiment is preferably 0.4 ⁇ m or more, more preferably 0.5 ⁇ m or more, and even more preferably 0.6 ⁇ m or more. .
- the thickness of the iron-nickel alloy layer 30 included in the rolled surface-treated steel sheet 1 of this embodiment is preferably 0.4 ⁇ m or more, more preferably 0.5 ⁇ m or more, and even more preferably 0.6 ⁇ m or more. .
- the thickness of the iron-nickel alloy layer 30 is preferably 3.5 ⁇ m or less, more preferably 3.0 ⁇ m or less.
- the thickness of the iron-nickel alloy layer 30 is calculated by analyzing the cross section of the rolled surface-treated steel sheet 1 using SEM-EDX (energy dispersive X-ray spectroscopy). Quantitative analysis of nickel and iron at depths up to 10 ⁇ m can be performed. If the thickness of the iron-nickel alloy layer exceeds 10 ⁇ m, quantitative analysis is performed to the required depth.
- SEM-EDX energy dispersive X-ray spectroscopy
- FIG. 4 An example of a method for obtaining the thickness of the iron-nickel alloy layer 30 from a graph obtained by SEM-EDX is shown.
- the horizontal axis represents the depth direction distance ( ⁇ m) from the surface layer side
- the vertical axis represents the X-ray intensity of Ni and Fe.
- the graph of FIG. 4 shows that the shallower portion in the thickness direction has a high nickel content and a low iron content.
- the iron content increases as the thickness increases.
- the distance between 2/10 of the respective maximum values of nickel and iron is defined as the iron-nickel alloy layer 30, and its thickness can be read from the graph. is possible.
- the reason why the thickness of the iron-nickel alloy layer 30 is defined as the distance between 2/10 of the maximum values of nickel and iron in this embodiment is as follows.
- the thickness of the iron-nickel alloy layer 30 is a predetermined thickness or more, but when the thickness of the iron-nickel alloy layer 30 is measured by SEM-EDX, it is difficult to measure the thickness of the iron-nickel alloy layer 30 using a sample that has not been heat-treated. It was found that even in samples where there is no iron diffusion, the iron strength at the position where the nickel strength peaks is detected at a value of about 10% to 20% of the nickel strength. Further, after the nickel strength attenuated, that is, in the measurement of the base material 20 portion, the nickel strength continued to be detected at a value of about 3 to 8% of the maximum nickel strength.
- the nickel strength at this time was also about 2% of the iron strength, and it did not fall below 1% even if measurements were continued over 2 ⁇ m after attenuation. In other words, it was found that nickel strength and iron strength are influenced by each other in a trace amount range in measurements by SEM-EDX. Therefore, in this specification, the thickness of the alloy layer that is more reliably formed into an alloy is defined as a range in which a strength of 2/10 or more of each maximum strength is detected.
- the iron-nickel alloy layer 30 is provided on one side of the base material 20 in FIG. 1, it is not limited to this, and it is preferable that it is provided on both sides of the base material 20, although not shown. Further, when iron-nickel alloy layers 30 are provided on both sides, the thickness of one iron-nickel alloy layer 30 may be the same as that of the other iron-nickel alloy layer 30, or may be different.
- the method for forming the iron-nickel alloy layer 30 is preferably plating or a method using plating and heat treatment, and examples of the plating include methods such as electrolytic plating, electroless plating, hot-dip plating, and dry plating. Among these, the method using electrolytic plating is particularly preferred from the viewpoint of cost, film thickness control, etc.
- a nickel plating layer is formed on at least one side of the base material 20 by a method such as electrolytic plating, and then iron (Fe) in the base material 20 and nickel (Ni) in the nickel plating layer are diffused by heat diffusion treatment or the like.
- examples include a method of forming an alloy by plating the metal, and a method of forming an alloy layer by iron-nickel alloy plating.
- nickel plating is applied, and iron and nickel are alloyed by interdiffusion through heat treatment.
- a nickel alloy layer is formed.
- the amount of nickel deposited in the iron-nickel alloy layer 30 is preferably 0.89 g/m 2 to 26.7 g/m 2 .
- the amount of nickel deposited on the iron-nickel alloy layer 30 can be measured by X-ray fluorescence analysis (XRF) or the like.
- the method described in International Publication No. WO2020/017655 and International Publication No. WO2021/020338 can be appropriately adopted. That is, it can be determined by measuring the total nickel amount of the rolled surface-treated steel sheet 1 using X-ray fluorescence analysis (XRF) or the like.
- XRF X-ray fluorescence analysis
- the overall thickness of the rolled surface-treated steel sheet 1 in this embodiment will be explained. Note that the "thickness of the rolled surface-treated steel sheet 1" in this embodiment may be measured by cross-sectional observation using a scanning electron microscope (SEM) or by using a micrometer.
- SEM scanning electron microscope
- the overall thickness of the rolled surface-treated steel sheet 1 in this embodiment is preferably in the range of 0.03 mm to 0.8 mm.
- it is more preferably 0.03 mm to 0.3 mm, and when used as a foil requiring better cracking resistance and threadability, 0.03 mm to 0.3 mm. 0.15 mm is more preferably used.
- the thickness range is exceeded, if the plate thickness is large, the surface load (such as elongation) against deformation during sheet passing becomes larger, which is not preferable, as the surface deformation increases.
- the thickness is less than the lower limit of the above thickness range, there is a high possibility that tears, tears, wrinkles, etc. will occur during handling, and when used as battery materials, there will be a risk of damage caused by battery charging and discharging. In some cases, it may be difficult to have sufficient strength.
- this embodiment may be a rolled surface-treated steel sheet 2 in which a metal layer 40 is formed on an iron-nickel alloy layer 30.
- the metal layer 40 may be a nickel layer or a layer made of a metal other than nickel, such as a layer made of zinc, tin, or chromium. Zinc or tin may be an alloy layer based on these.
- the layer consisting of chromium also includes a chromate layer.
- the iron-nickel alloy layer 30 of this embodiment follows the elongation of the base material and has the property of being difficult to break.
- the thickness of the metal layer 40 is preferably 0.05 to 3.0 ⁇ m.
- the thickness of the upper nickel layer is 0.05 mm from the viewpoint that the crystal structure inherits the crystal structure of the lower iron-nickel alloy layer 30 and good cracking resistance can be achieved. It is preferably 0.8 ⁇ m to 0.8 ⁇ m, more preferably 0.1 to 0.8 ⁇ m, and even more preferably 0.15 to 0.7 ⁇ m.
- the upper nickel layer can be formed by nickel plating on the steel sheet after rolling the iron-nickel alloy layer.
- the crystal orientation and the average crystal grain size of nickel are measured in the formed state when the metal layer 40 is a nickel layer or a layer made of chromium. That is, the iron-nickel alloy layer 30 in the rolled surface-treated steel sheet 2 contains Fe 1 Ni 1 , and the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 is 0.7 or more, and Fe 1 Ni It is characterized in that the orientation index in X-ray diffraction of the (220) plane of No. 1 is 0.7 or more and less than 2.5.
- the difference (absolute value) between the orientation index in X-ray diffraction of the (200) plane of Fe 1 Ni 1 and the orientation index in X-ray diffraction of the (220) plane of Fe 1 Ni 1 is 1.0 or less. is preferred. Further, it is more preferable that the orientation index in X-ray diffraction of the (111) plane of Fe 1 Ni 1 is 0.3 to 2.0.
- the metal layer 40 is a layer consisting of zinc or tin, it is preferable to measure after melting only the metal layer 40.
- the average crystal grain size of nickel on the surface of the metal layer 40 is 0.00000000000000 according to electron beam backscatter diffraction (EBSD) measurement data. It is preferably 4 ⁇ m to 1.1 ⁇ m.
- the average crystal grain size of nickel in the present disclosure is the average crystal grain size of nickel crystals, iron-nickel alloy crystals, or nickel crystals and iron-nickel alloy crystals.
- the iron-nickel alloy layer 30 may be partially exposed on the surface of the rolled surface-treated steel sheet 2 depending on the thickness and unevenness of the metal layer 40, but the nickel on the surface of the rolled surface-treated steel sheet 2 may
- the value of the average crystal grain size is a value that reflects the grain sizes of both the iron-nickel alloy layer 30 and the metal layer 40.
- the metal layer 40 is a layer consisting of zinc or tin, it is preferable to measure after melting only the metal layer 40.
- the surface thereof is an iron-nickel alloy layer 30, and the proportion of iron at least on the outermost surface is preferably 0 to 65% or less.
- the proportion of iron on the surface of the rolled surface-treated steel foil can be measured by GDS (glow discharge luminescent surface analysis).
- the surface of the rolled surface-treated steel sheet 2 in the above modification has a metal layer 40 (for example, a nickel layer). Even in the modified example where the metal layer 40 is a nickel layer, it is preferable that the proportion of iron at least on the outermost surface is 0 to 65% or less.
- the above-mentioned proportion of iron can be measured by GDS.
- Example ⁇ The present invention will be described in more detail below with reference to Examples. First, the measurement method in Examples will be described.
- the Vickers hardness of the surface layer of the rolled surface-treated steel sheet was measured and evaluated using a hardness meter. It was measured using a micro Vickers hardness tester (HM-103 manufactured by Mitutoyo) according to JIS Z 2244 (Vickers hardness test - test method). Two types of indenters were used: one with a load of 10 g and one with a load of 50 g. As a result of measurement under a load of 10 g, hardness could be obtained at a depth of 0 to 2.2 ⁇ m in all Examples and Comparative Examples. Further, as a result of measurement under a load of 50 g, hardness was obtained at a depth of 2.2 ⁇ m to 4.4 ⁇ m in all Examples and Comparative Examples.
- the count number of K ⁇ of Ni to the count number of K ⁇ of Fe was calculated as a ratio. This ratio is defined as the K ⁇ count ratio.
- the portion where the K ⁇ count ratio was less than 3.0 was defined as a portion other than the Fe-rich portion, and the portion where the K ⁇ count ratio was maximum was defined as the most Fe-rich portion. Then, the ratio (count number ratio) between the K ⁇ count ratio of the parts other than the Fe-rich part and the K ⁇ count ratio of the most Fe-rich part was calculated, and the degree of exposure of the iron component was evaluated.
- the count ratio in Table 2 is calculated by the following formula.
- K ⁇ count ratio K ⁇ count number of Fe at the measurement point / K ⁇ count number of Ni at the measurement point
- Count ratio K ⁇ count ratio of the most Fe-rich area / K ⁇ count ratio of areas other than the Fe-rich area
- the count ratio exceeds 100, it is determined that the iron in the base material is exposed, if it is 20 or more and 100 or less, it is determined that the iron in the base material or iron-nickel alloy layer is exposed, and if it is 5 or more. If it is less than 20, it is determined that at least iron components are exposed, and if it is less than 5, it can be determined that iron exposure is sufficiently suppressed.
- the coefficient of friction For the coefficient of friction, the value provided by the software of the testing machine was used. Then, the threadability was evaluated by comparing the friction coefficient at four turns, where there is a clear difference in the friction coefficient, and the sum of the friction coefficients at a pitch of 0.5 turns from 0 to 5 turns.
- the lower coefficient of friction reduces damage to molds and rolls during processing and continuous coating, leading to improved material quality, and less damage to equipment (molds, rolls), extending the life of the equipment. In view of this, it was rated as having high threadability.
- the measured diameter of the rolled surface-treated steel sheet was ⁇ 60 mm (measured area 28.26 cm 2 ).
- a rectifier manufactured by Kikusui Electronics Co., Ltd., compact DC stabilized power supply PMX18-5A
- an ammeter manufactured by Hioki Electric Co., Ltd., digital multimeter
- a meter DT4282 was used.
- the specific measurement conditions are to apply 2.25 A to the sample for 30 minutes on the hydrogen generation side to generate hydrogen on the sample surface, and to measure the change in oxidation current that occurs when hydrogen atoms pass through on the hydrogen detection side. Measured every second. Note that no current was applied to the hydrogen detection side.
- it is immersed in an electrolytic solution for 20 minutes or more, and the current value of the ammeter on the hydrogen detection side becomes stable at 10 ⁇ A or less. It was confirmed.
- Hydrogen permeation current density I ( ⁇ A/cm 2 ) was calculated from the change in oxidation current on the hydrogen detection side obtained by the above method.
- X-ray diffraction (XRD) measurement was performed for the purpose of evaluating the state of the alloy consisting of iron and nickel contained in the rolled surface-treated steel sheet.
- X-ray diffraction measuring device Rigaku's SmartLab
- the sample was cut into 20 mm x 20 mm.
- the specific measurement conditions for X-ray diffraction were as follows.
- Crystal orientation index of X-ray diffraction of (200) plane of Fe 1 Ni 1 crystal orientation index of X-ray diffraction of (220) plane of Fe 1 Ni 1
- crystal orientation index of X-ray diffraction of (111) plane of Fe 1 Ni 1 The crystal orientation index was calculated for each, and the difference between the crystal orientation index for the (200) plane and the (220) plane was determined. The results are listed in Table 5.
- ⁇ Device configuration> ⁇ X-ray source: CuK ⁇ ⁇ Goniometer radius: 300nm ⁇ Optical system: Concentration method (incidence side slit system) ⁇ Solar slit: 5° ⁇ Longitudinal limit slit: 5mm ⁇ Divergence slit: 2/3° (Receiving side slit system) ⁇ Scattering slit: 2/3° ⁇ Solar slit: 5° ⁇ Light receiving slit: 0.3mm ⁇ Monochromatic method: Counter monochromator method ⁇ Detector: Scintillation counter ⁇ Measurement parameters> ⁇ Target: Cu ⁇ Tube voltage - tube current: 45kVKv 200mA ⁇ Scanning axis: 2 ⁇ / ⁇ (concentration method) ⁇ Scanning mode: Continuous ⁇ Measurement range: 2 ⁇ 40 ⁇ 100° ⁇ Scanning speed: 10°/min ⁇ Step: 0.02°
- the nickel grain size was determined by performing crystal orientation analysis by EBSD (electron back scattering diffraction) measurement using a scanning electron microscope (SEM). Specifically, the average crystal grain size was obtained by obtaining and analyzing information on a diffraction pattern called a Kikuchi pattern under the following conditions. Specifically, the value calculated as Average Number (Diameter) was obtained as the average crystal grain size.
- the crystal grain size is the average crystal grain size of nickel crystals, iron-nickel alloy crystals, or nickel crystals and iron-nickel alloy crystals. Table 6 shows the average grain size obtained.
- Example 1 a cold rolled foil (thickness: 55 ⁇ m) of low carbon aluminum killed steel having the chemical composition shown below was prepared as a base material.
- C 0.04% by weight
- Mn 0.32% by weight
- Si 0.01% by weight
- P 0.012% by weight
- S 0.014% by weight
- balance Fe and inevitable impurities.
- the prepared base material was electrolytically degreased and pickled by sulfuric acid immersion, and then nickel plating was performed on both sides of the steel foil under the following conditions to form a 0.5 ⁇ m thick nickel plating layer on both sides. Formed.
- the conditions for nickel plating were as follows. (Nickel plating conditions) Bath composition: Nickel sulfate hexahydrate: 250g/L Nickel chloride hexahydrate: 45g/L Boric acid: 30g/L Bath temperature: 60°C pH: 4.0-5.0 Stirring: Air stirring or jet stirring Current density: 10A/dm 2
- the steel foil having the nickel plating layer formed above was heat treated by box annealing at a soaking temperature of 560° C. for a soaking time of 6 hours in a reducing atmosphere (heat treatment step). Through this heat treatment, a nickel-plated surface-treated steel sheet having iron-nickel alloy layers on both sides was obtained. Next, this nickel-plated surface-treated steel sheet was rolled (rolling step). The rolling conditions were cold rolling with a rolling reduction of 11%. The rolling reduction ratio was calculated based on the assumption that the thickness of the nickel-plated steel sheet before rolling (the thickness of the base material and the thickness of the nickel-plated layer on both sides) was set to 50 ⁇ m by rolling.
- Example 2 The same procedure as in Example 1 was carried out, except that the thickness of the nickel plating layer on both sides was 1.0 ⁇ m, and the reduction rate in the rolling process was 12%.
- Example 3 The same procedure as in Example 1 was conducted except that the soaking temperature in the heat treatment step was 590°C.
- Example 4 Example 2 except that the thickness of the nickel plating layer on both sides was 1.0 ⁇ m, the soaking temperature in the heat treatment process was 590°C, and the rolling reduction rate in the rolling process was 12%. I did the same thing.
- Example 5> The same procedure as in Example 3 was carried out, except that the thickness of the base material was 60 ⁇ m, the soaking temperature in the heat treatment step was 590° C., and the reduction rate in the rolling step was 18%.
- Example 6 Example 5 except that the thickness of the nickel plating layer on both sides was 0.4 ⁇ m, the soaking temperature in the heat treatment process was 560°C, and the rolling reduction rate in the rolling process was 18%. I did the same thing.
- Example 7 The same procedure as in Example 6 was carried out except that the thickness of the nickel plating layer on both sides was 0.2 ⁇ m.
- Example 8> The same procedure as in Example 6 was performed except that the thickness of the nickel plating layer on both sides was 0.18 ⁇ m.
- Example 9 The same procedure as in Example 5 was carried out except that the thickness of the nickel plating layer on both sides was 0.2 ⁇ m.
- Example 10> The same procedure as in Example 6 was carried out except that the thickness of the nickel plating layer on both sides was 0.1 ⁇ m.
- Example 11> After the rolling process, a strike nickel plating process and a second nickel plating process were further performed to form a nickel layer on the iron-nickel alloy layer. Other than that, the same procedure as in Example 8 was carried out. The second nickel plating treatment was performed under the same plating conditions as when the base material was subjected to nickel plating treatment. The thickness of the nickel layer on the iron-nickel alloy layer after the second nickel plating treatment was 0.5 ⁇ m. Each evaluation was performed using a rolled surface-treated steel sheet after the nickel layer was formed.
- ⁇ Comparative example 1> The thickness of the base material was 50 ⁇ m, the thickness of the nickel plating layer on both sides was 0.35 ⁇ m, and no heat treatment or rolling was performed.
- ⁇ Comparative example 2> The thickness of the base material was 200 ⁇ m, and the thickness of the nickel plating layer on both sides was 0.4 ⁇ m on one side and 1.0 ⁇ m on the other side. Further, in the heat treatment step, the heat treatment temperature was 800° C., the heat treatment time was 1 minute, and continuous annealing was performed without rolling. Other than that, the same procedure as in Example 1 was carried out.
- ⁇ Comparative example 3> The thickness of the base material was 200 ⁇ m, and the thickness of the nickel plating layer on both sides was 3.0 ⁇ m on one side and 1.0 ⁇ m on the other side. Further, in the heat treatment step, the heat treatment temperature was 800° C., the heat treatment time was 1 minute, and continuous annealing was performed without rolling. Other than that, the same procedure as in Example 1 was carried out.
- ⁇ Comparative example 4> The thickness of the base material was 200 ⁇ m, and the thickness of the nickel plating layer on both sides was 5.0 ⁇ m. Further, the heat treatment temperature in the heat treatment step was 670° C. , and continuous heat treatment was performed for 40 seconds. The rolling reduction rate in the rolling process was 65-75%, which was the initial rolling reduction rate after the nickel plating process. Other than that, the same procedure as in Example 1 was carried out.
- Table 1 shows the thickness of the base material and the conditions of each step. In addition, each measurement value and evaluation result are shown in Table 2 and thereafter.
- the rolled surface-treated steel sheet of this embodiment could be evaluated as follows.
- Comparative Example 4 which was rolled at a high reduction rate, broke before applying 3% tension, and the iron was exposed even at 1% elongation.
- the rolled surface-treated steel sheets of Examples can be evaluated as having good properties in that iron exposure is difficult to occur and it is difficult to crack even when a 3% tension is applied.
- Comparative Example 5 which was subjected to rolling at a high reduction rate and then heat treatment again and rolling again, had a hardness comparable to that of Comparative Example 1, and 3. % iron exposure after tension was also improved, while the rolled surface-treated steel sheets of the examples can be evaluated to have even better properties in terms of crackability.
- the results of comparing Examples and Comparative Examples showed that the rolled surface-treated steel sheets of Examples had a significantly lower coefficient of friction than the nickel-plated steel sheets of Comparative Examples. Specifically, it was shown that the friction coefficient for 4 laps was excellent at 0.4 or less, and the total sum from 0 to 5 laps was also significantly lower than that of the comparative example. As a result, it is possible to obtain a good surface with few scratches due to wear, and it is possible to suppress scratches due to wear during roll passing. In particular, it has excellent scratch resistance during passing through a squeeze roll, when passing through a progressive roll, and during coating when applying another layer such as an active material to the upper layer.
- the rolled surface treated steel sheet of the example has Fe 1 Ni 1 crystal grains in the iron-nickel alloy layer in a state where both (200) and (220) are moderately mixed. It is thought that by oriented in this manner, it is possible to create a layer that is difficult to break while maintaining appropriate hardness. It is also considered to have excellent hydrogen barrier properties and to be able to suppress an increase in the coefficient of friction. On the other hand, since Comparative Examples 4 and 5 underwent a rolling process at a high rolling reduction ratio, the (220) orientation was dominant.
- the rolled surface treated steel sheet of the Examples was found to have the following properties: It was confirmed that the Ni-based fcc crystal grain size was larger than that of Comparative Example 1, which was a nickel-plated plate. Based on the examples of the present invention, it is considered that it is possible to suppress an increase in the coefficient of friction by setting the average crystal grain size to 0.4 ⁇ m or more.
- Comparative Example 3 which was heat treated after nickel plating, and Examples 1 to 11, it was confirmed that in Comparative Example 3, the crystal grains became coarse due to the heat treatment, and the average crystal grain size became larger. Furthermore, since Comparative Example 3 has a large average crystal grain size and is soft, it is sheared and deformed by shear stress during friction, so it can be understood that the coefficient of friction becomes high. On the other hand, in the examples, it is considered that it is possible to suppress an increase in the coefficient of friction by setting the average crystal grain size to 0.4 ⁇ m to 1.1 ⁇ m. Furthermore, it is considered possible to set the hardness of the outermost surface of the rolled surface-treated steel sheet and the intermediate layer between the base material and the outermost surface within an appropriate range.
- Comparative Example 5 which was rolled at a high reduction rate after forming an iron-nickel alloy layer, and Examples 1 to 11, it was found that in Comparative Example 5, the crystal grains were coarsened due to rolling at a high reduction rate and heat treatment. , I confirmed that it was getting bigger.
- the rolled surface-treated steel sheet of the present invention can be applied to various types of battery current collectors, battery members such as battery containers and terminals, electronic related equipment, and the like.
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Abstract
Description
以下、本発明の圧延表面処理鋼板の製造方法を実施するための実施形態について説明する。なお本実施形態の製造方法により製造された圧延表面処理鋼板は、二次電池等の正極又は負極の集電体や、電子関連機器等に適用される。
まず原板を用意する。ここでいう原板とは、後述する鉄ニッケル合金層形成工程により鉄ニッケル合金層を形成する基材となる鋼の部分である。原板は、低炭素鋼または極低炭素鋼であることが好ましい。
本実施形態の鉄ニッケル合金層形成工程として、基材となる鋼板上にニッケルめっき層を形成し(ニッケルめっき工程)、その後に前記ニッケルめっき工程で得られたニッケルめっき材に熱処理を施して拡散による鉄ニッケル合金層を形成する(熱処理工程)方法を挙げることができる。
・浴組成:
硫酸ニッケル六水和物:200~300g/L
塩化ニッケル六水和物:20~60g/L
ほう酸:10~50g/L
浴温:40~70℃
pH:3.0~5.0
撹拌:空気撹拌又は噴流撹拌
電流密度:5~30A/dm2
なお、浴組成については、上記のワット浴の他、公知のスルファミン酸ニッケル浴やクエン酸浴を用いてもよい。さらに公知の光沢剤などの添加物をめっき浴に添加して、光沢ニッケルめっき又は半光沢ニッケルめっきとしてもよいが、ニッケル皮膜の硬質化を避けるために硫黄を含有する光沢剤を含まない無光沢ニッケルめっきまたは半光沢ニッケルめっきが好ましい。
本実施形態における熱処理工程について、原板に形成したニッケル層に対して熱を加えることにより、原板の鉄とニッケル層のニッケルとを相互拡散させ、熱拡散による鉄ニッケル合金層を形成させるために行われる工程である。本実施形態の熱処理工程は、連続焼鈍でもよいしバッチ焼鈍(箱型焼鈍)であってもよい。
次に、本実施形態における圧延工程について説明する。本実施形態における圧延工程は、上記鉄ニッケル合金層形成工程を経た後、鉄ニッケル合金層が形成された鋼板を冷間圧延する工程である。この圧延工程は、所望の圧延表面処理鋼板の厚さを得ること、及び、鉄ニッケル合金層に含まれる金属結晶を好ましい状態に制御すること、得られる圧延表面処理鋼板の耐割れ性や通板性を向上させること、等を目的とする。
・SEM:日立ハイテクノロジーズ製 SU8020
・測定プログラム:OIM Data Collection
・データ解析プログラム:OIM Analysis(Ver.6.2.0)
・測定範囲 100μm×120μm
・Grain Tolerance Angle:5°
・ステップ幅:0.20μm
・Average Number(Diameter)
以下、本実施形態における圧延表面処理鋼板について説明する。なお本実施形態における圧延表面処理鋼板は、上述した製造方法により製造される。
本実施形態の圧延表面処理鋼板1を構成する基材20としては、Crおよび他の添加金属元素が1.0重量%未満である鉄を基とする鋼板が好ましい。具体的には、低炭素アルミキルド鋼に代表される低炭素鋼(炭素量0.01~0.15重量%)、炭素量が0.01重量%未満の極低炭素鋼、または極低炭素鋼にTiやNbなどを添加してなる非時効性極低炭素鋼が好適に用いられる。
本実施形態の圧延表面処理鋼板1に含まれる鉄ニッケル合金層30は鉄(Fe)とニッケル(Ni)が含まれる合金層であり、鉄とニッケルからなる合金(「鉄-ニッケル合金」、「Fe-Ni合金」とも称する)が含まれる金属層である。なおこの鉄とニッケルからなる合金状態としては、固溶体、共析・共晶、化合物(金属間化合物)のいずれであってもよいし、それらが共存していてもよい。
[I_Fe1Ni1(200)/[I_Fe1Ni1(111)+I_Fe1Ni1(200)+I_Fe1Ni1(220)+I_Fe1Ni1(311)+I_Fe1Ni1(222)]]
/[IS_Fe1Ni1(200)/[IS_Fe1Ni1(111)+IS_Fe1Ni1(200)+IS_Fe1Ni1(220)+IS_Fe1Ni1(311)+IS_Fe1Ni1(222)]]
[I_Fe1Ni1(220)/[I_Fe1Ni1(111)+I_Fe1Ni1(200)+I_Fe1Ni1(220)+I_Fe1Ni1(311)+I_Fe1Ni1(222)]]
/[IS_Fe1Ni1(220)/[IS_Fe1Ni1(111)+IS_Fe1Ni1(200)+IS_Fe1Ni1(220)+IS_Fe1Ni1(311)+IS_Fe1Ni1(222)]]
I_Fe1Ni1(111):X線回折により測定されたFe1Ni1(111)結晶面の回折強度
I_Fe1Ni1(200):X線回折により測定されたFe1Ni1(200)結晶面の回折強度
I_Fe1Ni1(220):X線回折により測定されたFe1Ni1(220)結晶面の回折強度
I_Fe1Ni1(311):X線回折により測定されたFe1Ni1(311)結晶面の回折強度
I_Fe1Ni1(222):X線回折により測定されたFe1Ni1(222)結晶面の回折強度
具体的には、(111)面は43.83°±0.11°、(200)面は51.05°±0.11°、(220)面は75.10±0.11、(311)面は91.23±0.11、(222)面は96.56±0.11の範囲における最大値である。
上記予想の結果、発明者らが測定・評価を行い、本実施形態において、上述したような電圧低下(自己放電)の発生を抑制するためには、本実施形態の圧延表面処理鋼板は、電気化学的に測定される酸化電流値から得られる水素透過電流密度が10μA/cm2以下であることが好ましいという結論に帰結した。なお、本実施形態における水素透過電流密度の測定条件は、電解液の液温:45℃とし、測定径φ60mmの測定面積(28.26cm2)に対して水素侵入側は電流を2.25A印加、水素検出側は電流印加なしとする。ここで水素発生側の電流値を2.25Aとした理由は、圧延表面処理鋼板中を透過・移動するために必要な水素量を十分に発生させるためである。
なお図5に示されるとおり、本実施形態は、鉄ニッケル合金層30の上に、金属層40が形成される圧延表面処理鋼板2であってもよい。なお金属層40は、ニッケル層であってもよいし、ニッケル以外の他の金属からなる層であってもよく、例えば亜鉛、錫、クロムからなる層などが挙げられる。亜鉛や錫はこれらを基とする合金層であってもよい。クロムからなる層はクロメート層も含まれる。本実施形態の鉄ニッケル合金層30は基材の伸びに追随し割れにくい特性を有する。そして、上層に金属層40が形成されている場合も、中間層となる鉄ニッケル合金層が割れにくいため、表層の金属層40(例えばニッケル層)の耐割れ性も良好となる。金属層40の厚みとしては、0.05~3.0μmが好ましい。金属層40としてニッケル層を形成する場合、特に、下層の鉄ニッケル合金層30の結晶構造を引き継いだ結晶構造となり良好な耐割れ性とできるという観点から、上層のニッケル層の厚みが0.05~0.8μmであることが好ましく、より好ましくは0.1~0.8μmであり、0.15~0.7μmであることがさらに好ましい。上層のニッケル層は鉄ニッケル合金層を圧延したあとの鋼板において、ニッケルめっきで形成することが可能である。
以下に、実施例を挙げて本発明について、より具体的に説明する。まず、実施例における測定方法について記載する。
圧延表面処理鋼板の表層におけるビッカース硬度を、硬度計により測定して評価した。マイクロビッカース硬さ試験機(ミツトヨ社製 HM-103)を用い、JIS Z 2244(ビッカース硬さ試験-試験方法)に準じて測定した。圧子として荷重10g及び荷重50gの2種類を使用した。荷重10gで測定した結果、いずれの実施例、比較例においても0~2.2μmの深さで測定され硬度を得ることができた。また荷重50gで測定した結果、いずれの実施例、比較例においても2.2μm~4.4μmの深さで測定され硬度を得ることが出来た。
圧延表面処理鋼板の割れ特性について、引張り試験(JIS Z 2241)により3%の伸びを付与した後に、走査型電子顕微鏡(SEM)を用いたSEM観察およびエネルギー分散型X線分析(EDS)を行い、表面からの鉄(Fe)の露出を観察した。測定条件は以下のとおりとした。
・サンプルサイズ:JIS K 6251規格試験片 6号
・引張装置:島津社製 AGX-V
・伸び計:島津社製 TRViewX
・引張速度:1.0(mm/min)
・伸び率:1.0%、3.0%
・装置:KEYENCE社製 VE-8800
・ビーム条件:加速電圧15kV、照射電流量5×10-8A
・ワークディスタンス:35mm
・観察視野:150μm×150μm
・観察面:圧延面
・観察倍率:1000倍、3000倍
装置:OXFORD社製 X-act
分析方法:10点(N=10)
引張試験による伸び3.0%を与えたサンプルについて、SEM画像で表面が凹部となっている箇所を任意に10点観察し、各観察箇所でEDS点分析を行った。他の測定点に対し際立って鉄のピークが高い(Feリッチ)部分の有無を確認し、その個数をカウントし確認数とした。Feリッチ部分があれば伸び3.0%付与時に割れが発生し鉄が露出しやすい状態となったと判断される。Feリッチ部分の確認箇所は6点以下であることが好ましく、より好ましくは3点以下である。さらに、各EDS点分析において、FeのKαのカウント数に対するNiのKαのカウント数を比で算出した。この比をKαカウント比とする。このKαカウント比が3.0未満の部分をFeリッチな箇所以外の部分とし、Kαカウント比が最大となる箇所を最もFeリッチな箇所とした。そして、Feリッチな箇所以外のKαカウント比と最もFeリッチな箇所のKαカウント比との比(カウント数比)を算出し、鉄成分の露出度合を評価した。
Kαカウント比=測定点のFeのKαのカウント数/測定点のNiのKαのカウント数
カウント数比=最もFeリッチな箇所のKαカウント比/Feリッチな箇所以外の部分のKαカウント比
圧延表面処理鋼板の摩擦特性は、ボールオンディスク方式の摩擦試験(Anton Paar社製 摩擦摩耗試験機Tribometer TRB3)により測定し、通板性の評価を行った。ボール直径6mmのクロムスチール球(SUJ2)を接触子として用い、回転半径10mm、、荷重1.0N、モーター速度10rpm、回転数10とした。また、摩擦試験は、潤滑剤なし(ドライ条件)の条件で、JIS R 1613:2010に準拠して行った。
図2に記載の装置を用いて、水素透過電流密度の測定を行った。具体的なサンプルのセッティング方法としては、図2(a)に示すように水素発生用のセルXおよび透過水素の検出用セルYの2つのセルを準備し、この2つの測定セルの間に圧延表面処理鋼板の試験片(サンプル)を設置した。そして、各測定セルに45℃の電解液(KOHを主成分として6mol/L含み、KOH、NaOH、LiOHの合計濃度が濃度:7mol/Lであるアルカリ水溶液)を充填し、対極(CE1及びCE2)を浸漬した。また、対極には白金(Pt)を使用した。なお、図2(b)に示すように圧延表面処理鋼板における測定径はφ60mm(測定面積28.26cm2)とした。水素侵入側の電流制御には、整流器(菊水電子工業株式会社製、コンパクト直流安定化電源PMX18-5A)を用いて、水素検出側の電流測定には電流計(日置電機株式会社製、デジタルマルチメータDT4282)を使用した。
具体的な測定条件は、水素発生側でサンプルへ2.25Aを30分間印加し、サンプル表面に水素を発生させ、水素検出側で水素原子が透過してきた際に発生する酸化電流の変化を10秒毎に測定した。なお、水素検出側は電流印加なしとした。また、水素発生側の電流印加前に、圧延表面処理鋼板の表面を安定化させるために20分間以上電解液中に浸漬保持し、水素検出側の電流計の電流値が10μA以下で安定となることを確認した。
上記手法にて得られた水素検出側の酸化電流の変化より、水素透過電流密度I(μA/cm2)を算出した。具体的には、電流印加30分時における酸化電流値と、電流印加直前(0秒)の電流値の差を測定面積28.26cm2で除した値を水素透過電流密度とした。結果を表4に示す。
水素バリア性評価は下記の様に評価し、判定C以上が実用に好適であると判断した。
A:水素透過電流密度が1.0μA/cm2未満
B:水素透過電流密度が1.0μA/cm2以上、2.5μA/cm2未満
C:水素透過電流密度が2.5μA/cm2以上、10μA/cm2未満
D:水素透過電流密度が10μA/cm2以上、30μA/cm2未満
E:水素透過電流密度が30μA/cm2以上
圧延表面処理鋼板に含まれる、鉄とニッケルからなる合金の状態を評価する目的で、X線回折(XRD)測定を行った。X線回折測定装置としては、Rigaku製SmartLab)を用いた。試料は、20mm×20mmに切断して用いた。X線回折の具体的な測定条件としては、次の仕様とした。Fe1Ni1の(200)面のX線回折の結晶配向指数、Fe1Ni1の(220)面のX線回折の結晶配向指数、Fe1Ni1の(111)面のX線回折の結晶配向指数をそれぞれ算出し、また、(200)面と(220)面の結晶配向指数の差分を求めた。結果を表5に記載する。
・X線源:CuKα
・ゴニオメータ半径:300nm
・光学系:集中法
(入射側スリット系)
・ソーラースリット:5°
・長手制限スリット:5mm
・発散スリット:2/3°
(受光側スリット系)
・散乱スリット:2/3°
・ソーラースリット:5°
・受光スリット:0.3mm
・単色化法:カウンターモノクロメーター法
・検出器:シンチレーションカウンタ
<測定パラメータ>
・ターゲット:Cu
・管電圧-管電流:45kVKv 200mA
・走査軸:2θ/θ(集中法)
・走査モード:連続
・測定範囲:2θ 40~100°
・走査速度:10°/min
・ステップ:0.02°
得られた圧延表面処理鋼板において、走査電子顕微鏡(SEM)を用いて、EBSD(electron back scattering diffraction)測定による結晶方位解析を行うことにより、ニッケル粒径を求めた。具体的には、下記条件で菊池パターンと呼ばれる回折パターンの情報を得て解析することで平均結晶粒径を得た。具体的にはAverageNumber(Diameter)として算出される数値を平均結晶粒径として得た。なお、測定時、ニッケルの回折パターンを指定するが、ニッケルに近い面心立方の結晶構造を有する鉄ニッケル合金からも同じ回折パターンで情報が得られるため、本発明におけるEBSD測定データによるニッケルの平均結晶粒径とは、ニッケルの結晶、鉄ニッケル合金の結晶、またはニッケルの結晶および鉄ニッケル合金の結晶の平均結晶粒径となる。得られた平均結晶粒径を表6に示した。
<EBSD測定条件、解析条件>
・SEM:日立ハイテクノロジーズ製SU8020
・測定プログラム:OIMDataCollection
・データ解析プログラム:OIMAnalysis(Ver.6.2.0)
・測定範囲100μm×120μm・GrainToleranceAngle:5°
・ステップ幅:0.20μm
・AverageNumber(Diameter)
まず基材として下記に示す化学組成を有する低炭素アルミキルド鋼の冷間圧延箔(厚さ55μm)を準備した。
C:0.04重量%、Mn:0.32重量%、Si:0.01重量%、P:0.012重量%、S:0.014重量%、残部:Feおよび不可避的不純物
(ニッケルめっきの条件)
浴組成:
硫酸ニッケル六水和物:250g/L
塩化ニッケル六水和物:45g/L
ほう酸:30g/L
浴温:60℃
pH:4.0~5.0
撹拌:空気撹拌又は噴流撹拌
電流密度:10A/dm2
ニッケルめっきによる両面のニッケルめっき層の厚さを各々1.0μmとした点、圧延工程における圧下率を12%とした点以外は、実施例1と同様に行った。
熱処理工程における均熱温度を590℃にした以外は、実施例1と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々1.0μmとした点、熱処理工程における均熱温度を590℃にした点、圧延工程における圧下率を12%とした点以外は、実施例2と同様に行った。
基材の厚みを60μmとした点、熱処理工程における均熱温度を590℃にした点、圧延工程における圧下率を18%とした点以外は、実施例3と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.4μmとした点、熱処理工程における均熱温度を560℃とした点、圧延工程における圧下率を18%とした点以外は、実施例5と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.2μmとした点以外は、実施例6と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.18μmとした点以外は、実施例6と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.2μmとした点以外は、実施例5と同様に行った。
ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.1μmとした点以外は、実施例6と同様に行った。
圧延工程後に、さらにストライクニッケルめっき処理および第2ニッケルめっき処理を施して、鉄ニッケル合金層上にニッケル層を形成した。それ以外は実施例8と同様に行った。第2ニッケルめっき処理は、基材にニッケルめっき処理を施したときと同じめっき条件で行った。第2ニッケルめっき処理後の鉄ニッケル合金層上のニッケル層の厚さは0.5μmであった。各評価はニッケル層形成後の圧延表面処理鋼板を用いて行った。
基材の厚みを50μmとし、ニッケルめっきによる両面のニッケルめっき層の厚さを各々0.35μmとし、熱処理及び圧延を行わなかった。
基材の厚みを200μmとし、ニッケルめっきによる両面のニッケルめっき層の厚さを片面0.4μm/他面1.0μmとした。また熱処理工程における熱処理温度を800℃、熱処理時間1分の連続焼鈍とし、圧延を行わなかった。それ以外は、実施例1と同様に行った。
基材の厚みを200μmとし、ニッケルめっきによる両面のニッケルめっき層の厚さを片面3.0μm/他面1.0μmとした。また熱処理工程における熱処理温度を800℃、熱処理時間1分の連続焼鈍とし、圧延を行わなかった。それ以外は、実施例1と同様に行った。
基材の厚みを200μmとし、ニッケルめっきによる両面のニッケルめっき層の厚さを各々5.0μmとした。また熱処理工程における熱処理温度を670℃、40秒の連続熱処理とした。圧延工程における圧下率は、ニッケルめっき工程後の最初の圧下率で65-75%とした。それ以外は、実施例1と同様に行った。
65~75%の圧下率で圧延した後、箱型焼鈍で590℃、6時間の熱処理を施し、さらにその後、15~20%の圧下率で冷間圧延を施した以外は比較例4と同様に行った。
ニッケルめっき板の比較例1と比較して、Ni系のfcc結晶粒径が大きくなっていることが確認された。本発明の実施例に基づけば、平均結晶粒径を0.4μm以上とすることで、摩擦係数の増加を抑制することが可能であると考えられる。
20:基材
30:鉄ニッケル合金層
2:圧延表面処理鋼板
40:金属層
Claims (6)
- 基材となる鋼板上に鉄ニッケル合金層を形成する鉄ニッケル合金層形成工程、
前記鉄ニッケル合金層形成工程後に、前記鉄ニッケル合金層を有する鋼板を圧下率5~25%で圧延する圧延工程、
を有する、圧延表面処理鋼板の製造方法。 - 前記鉄ニッケル合金層形成工程が、
前記基材となる鋼板上にニッケルめっき層を形成するニッケルめっき工程、
前記ニッケルめっき工程で得られたニッケルめっき材に熱処理を施して拡散による前記鉄ニッケル合金層を形成する熱処理工程、
を含む、請求項1に記載の圧延表面処理鋼板の製造方法。 - 鋼からなる基材と、前記基材上に設けられる鉄ニッケル合金層と、を有し、
前記鉄ニッケル合金層にはFe1Ni1が含まれると共に、Fe1Ni1の(200)面のX線回折における配向指数が0.7以上、且つ、Fe1Ni1の(220)面のX線回折における配向指数が0.7以上2.5未満であることを特徴とする、圧延表面処理鋼板。 - 圧延表面処理鋼板の表面におけるEBSD測定によって得られるニッケルの平均結晶粒径が0.4μm~1.1μmである、請求項3に記載の圧延表面処理鋼板。
- 前記Fe1Ni1の(200)面のX線回折における配向指数と前記Fe1Ni1の(220)面のX線回折における配向指数との差(絶対値)が1.0以下である、請求項3に記載の圧延表面処理鋼板。
- 前記Fe1Ni1の(111)面のX線回折における配向指数が0.3~2.0である、請求項3に記載の圧延表面処理鋼板。
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| US20250215600A1 (en) * | 2024-01-02 | 2025-07-03 | TCC Steel Corp. | Nickel plated heat treated steel sheet for battery case having excellent surface corrosion resistance with conductivity |
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| JPH0390592A (ja) * | 1989-08-31 | 1991-04-16 | Kawasaki Steel Corp | Di缶用表面処理鋼板の製造方法 |
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| WO2011083559A1 (ja) * | 2010-01-08 | 2011-07-14 | 東洋鋼鈑株式会社 | 表面処理金属板及びその表面処理金属板を用いた成形品の製造方法 |
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| JPS6029477A (ja) * | 1983-07-29 | 1985-02-14 | Nippon Steel Corp | 溶接性と塗装性能にすぐれた缶容器用鋼板の製造法 |
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2023
- 2023-04-28 EP EP23796554.6A patent/EP4516971A4/en active Pending
- 2023-04-28 CN CN202380049697.9A patent/CN119452122A/zh active Pending
- 2023-04-28 KR KR1020247038460A patent/KR20250005332A/ko active Pending
- 2023-04-28 WO PCT/JP2023/016948 patent/WO2023210822A1/ja not_active Ceased
- 2023-04-28 JP JP2024518082A patent/JPWO2023210822A1/ja active Pending
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| JPH0390592A (ja) * | 1989-08-31 | 1991-04-16 | Kawasaki Steel Corp | Di缶用表面処理鋼板の製造方法 |
| WO1997033706A1 (en) * | 1996-03-15 | 1997-09-18 | Kawasaki Steel Corporation | Ultra-thin sheet steel and method for manufacturing the same |
| WO2011083559A1 (ja) * | 2010-01-08 | 2011-07-14 | 東洋鋼鈑株式会社 | 表面処理金属板及びその表面処理金属板を用いた成形品の製造方法 |
| WO2013157600A1 (ja) | 2012-04-19 | 2013-10-24 | 新日鐵住金株式会社 | 鋼箔及びその製造方法 |
| WO2019198819A1 (ja) * | 2018-04-13 | 2019-10-17 | 日本製鉄株式会社 | Ni拡散めっき鋼板及びNi拡散めっき鋼板の製造方法 |
| WO2020017655A1 (ja) | 2018-07-19 | 2020-01-23 | 東洋鋼鈑株式会社 | 粗化ニッケルめっき板 |
| WO2021020338A1 (ja) | 2019-07-26 | 2021-02-04 | 東洋鋼鈑株式会社 | 粗化ニッケルめっき材及びその製造方法 |
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| TOORU TSURUTOKYO INSTITUTE OF TECHNOLOGY, MATERIALS AND ENVIRONMENTS, vol. 63, 2014, pages 3 - 9 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20250215600A1 (en) * | 2024-01-02 | 2025-07-03 | TCC Steel Corp. | Nickel plated heat treated steel sheet for battery case having excellent surface corrosion resistance with conductivity |
| EP4582599A1 (en) * | 2024-01-02 | 2025-07-09 | TCC Steel Corp. | Nickel plated heat treated steel sheet for battery case having excellent surface corrosion resistance with conductivity |
| US12584233B2 (en) * | 2024-01-02 | 2026-03-24 | TCC Steel Corp. | Nickel plated heat treated steel sheet for battery case having excellent surface corrosion resistance with conductivity |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2023210822A1 (ja) | 2023-11-02 |
| EP4516971A4 (en) | 2026-04-29 |
| EP4516971A1 (en) | 2025-03-05 |
| CN119452122A (zh) | 2025-02-14 |
| KR20250005332A (ko) | 2025-01-09 |
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