EP3228721A1 - Fil machine en acier à haute teneur en carbone présentant d'excellentes propriétés de tréfilage - Google Patents

Fil machine en acier à haute teneur en carbone présentant d'excellentes propriétés de tréfilage Download PDF

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Publication number
EP3228721A1
EP3228721A1 EP15865720.5A EP15865720A EP3228721A1 EP 3228721 A1 EP3228721 A1 EP 3228721A1 EP 15865720 A EP15865720 A EP 15865720A EP 3228721 A1 EP3228721 A1 EP 3228721A1
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EP
European Patent Office
Prior art keywords
wire rod
pearlite
steel wire
wire
less
Prior art date
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EP15865720.5A
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German (de)
English (en)
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EP3228721A4 (fr
Inventor
Toshihiko TESHIMA
Yoshihiro Daito
Toshiyuki Manabe
Daisuke Hirakami
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Publication of EP3228721A1 publication Critical patent/EP3228721A1/fr
Publication of EP3228721A4 publication Critical patent/EP3228721A4/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C21D8/06—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Definitions

  • the present invention relates to a high-carbon steel wire rod used for, after wire drawing, various wire ropes such as cables for power transmission lines and cables for suspension bridges, etc.
  • a high-carbon steel wire rod used for various wire ropes such as cables for power transmission lines and cables for suspension bridges, etc. is required to have, after wire drawing, not only high strength and high ductility but also good wire drawability from the viewpoint of productivity.
  • high-quality high-carbon wire rods have been variously developed from such requirements.
  • Patent Literature 1 proposes a technology to obtain good wire drawability by the reduction in the amount of solid solution N by the addition of Ti and the reduction in strain aging by solid solution Ti.
  • Patent Literature 2 proposes a technology to obtain low strength and good wire drawability by controlling the cementite form to a spheroidized form.
  • Patent Literature 3 proposes a technology that specifies the amount of each of C, Si, Mn, P, S, N, Al, and O contained in a steel material and controls the area ratio of the second phase, ferrite, and the pearlite lamellar spacing, to obtain a wire rod excellent in wire drawability in which wire breaking is less likely to occur and by which die wear is suppressed to allow the life of the die to be extended.
  • Patent Literature 4 proposes a high-carbon steel wire rod with high ductility that contains C: 0.6 to 1.1% and contains 95% or more of the pearlite structure, wherein the maximum value of the pearlite block grain size of pearlite of a central portion of a hot rolled wire rod measured by an EBSP apparatus is 45 ⁇ m or less and the average value thereof is 10 to 25 ⁇ m.
  • the present invention has been made in view of such circumstances, and the present invention addresses an issue to provide a steel wire rod serving as a material for obtaining a steel wire having high strength and good wire drawability.
  • the present invention provides a high-carbon steel wire rod serving as a material of a high strength steel wire, and a gist of the present invention is as follows.
  • a high-carbon steel wire rod that has a tensile strength of 1300 MPa or more and yet has high ductility etc. can be provided; thus, the industrial contribution is very significant.
  • FIG. 1 shows a central portion A and an outer peripheral portion B of a cross section perpendicular to the wire rod longitudinal direction.
  • the area within a circle with a diameter of 1/2D from the center is defined as a central portion A
  • the area within 500 ⁇ m from the outer layer is defined as an outer peripheral portion B.
  • the pearlite block size can be measured by the electron back scatter diffraction (referred to as EBSD) method using the central portion A of FIG. 1 as the measurement site.
  • EBSD electron back scatter diffraction
  • a cross section perpendicular to the wire rod longitudinal direction is mirror-polished with colloidal silica particles, and measurement by the EBSD method is performed around the center in the diameter direction; thus, a map of ferrite crystal orientations is created.
  • the area of mapping is set to a rectangular area of which all the sides have a length of 500 ⁇ m or more, the pixel configuration is set to a regular hexagonal element array, and the measurement interval is set to 0.5 ⁇ m, for example.
  • the degree of accumulation of ferrite crystal orientations ⁇ 110> in the wire rod longitudinal direction can be measured by using the outer peripheral portion B of FIG. 1 as the measurement site and plotting the crystal orientation of each pixel on a ⁇ 110 ⁇ pole figure. More specifically, the degree of accumulation of ferrite crystal orientations ⁇ 110> can be measured by using the measurement result of the EBSD method to create a ⁇ 110 ⁇ pole figure and performing texture analysis or the like on the obtained pole figure. The degree of accumulation is expressed as the intensity ratio on the assumption that the case of the crystal orientation being random orientations is 1.
  • the information of the crystal orientation of ferrite is given to each hexagonal pixel; as a result, the information of the angular difference of crystal orientation is defined at the boundary between adjacent pixels.
  • a pixel boundary with an inclination difference of 9° or more appears successively, such as when there is a ferrite crystal orientation inclination difference of 9° or more at the boundary between two pixels and there is 9° or more also at the pixel boundary adjacent to that boundary, they are combined together and defined as a pearlite block grain boundary.
  • the pearlite block grain boundary branches.
  • the condition of the crystal orientation difference of the pixel boundary being 9° or more comes to an end on the way, the last pixel boundary is not regarded as a pearlite block grain boundary, and is not taken into account.
  • a pixel boundary having a ferrite orientation difference of 9° or more is defined over the entire rectangular area; when pixel boundaries surround one closed area, the area is defined as one pearlite block, and the pixel boundaries are defined as the pearlite block grain boundary.
  • Pearlite block grain boundaries are described on the map of ferrite crystal orientation in this way, and the block size of pearlite is measured.
  • one grain of the defined pearlite block is formed of 25 or less pixels is treated as noise, and is not taken into account.
  • the pearlite block and the pearlite nodule are synonymous.
  • the pearlite is lamellar pearlite.
  • the lamellar spacing can be found by corroding a cross section perpendicular to the wire rod longitudinal direction with nital, drawing a line perpendicularly for 5 lamellar spacings at a place where the lamellar spacing is smallest in the photographed visual field with a SEM at a magnification of 10,000 times, and dividing the length of the 5 lamellar spacings by 5.
  • the photographing with a SEM is performed on 10 or more visual fields, and the sum total of the lamellar spacings found in the visual fields is divided by the number of visual fields; thus, the average value is obtained.
  • the wire drawability is evaluated by dipping a test material with a length of 10 m in hydrochloric acid to remove scales, performing water washing, then performing bonderizing treatment, and performing dry wire drawing.
  • the wire drawing can be performed using a die made of WC-Co super hard alloy and having a shape with a die approach (entire) angle of 20° and a bearing length of approximately 0.3 times of the diameter.
  • the wire drawing rate may be set to 50 m/min, and a dry wire drawing lubricant mainly composed of sodium stearate and calcium stearate may be used.
  • the die diameter is reduced so that the rate of decrease in cross-sectional area is 20%, and wire drawing is performed until wire breaking occurs.
  • the evaluation is finished at the time point when the total number of times of wire breaking is 20, and the degree of wire drawing is found from the wire diameter (the wire diameter before the start of wire drawing) D0 of the test material and the die diameter D at which wire breaking occurs, using the following formula.
  • Degree of wire drawing ⁇ 2 ⁇ ln D 0 / D
  • FIG. 2 is a test result of a wire rod coil that serves as the criterion for assessing the wire drawability as good.
  • the degree of wire drawing is 1.7
  • the number of times of breaking is 1, and the cumulative rate of breaking on the vertical axis is 0.05 (1/20).
  • the degree of wire drawing is 1.9
  • the number of times of breaking is 5, and the rate of breaking is 0.25; when the cumulative rate of breaking before then (the degree of wire drawing: 1.7), i.e. 0.05, is added, the cumulative rate of breaking is 0.3.
  • the degree of wire drawing is at the maximum in the 20 tests, the cumulative rate of breaking is 1.0.
  • the degree of wire drawing at which the cumulative rate of breaking is 0.5 is found from a graph, and is defined as the wire drawability.
  • the wire drawability of the wire rod coil serving as the criterion for assessing the wire drawability as good is 2.23.
  • the rate of wire drawing at which the cumulative rate of breaking is 0.9 is 3.0
  • the rate of wire drawing at which the cumulative rate of breaking is 1.0 is 3.12.
  • the wire drawability being 2.23 or more is evaluated as good, it is preferable that the wire drawability being 2.53 or more be evaluated as good, and it is more preferable that the wire drawability being 2.95 or more be evaluated as good.
  • C is an element that turns the structure into pearlite and improves the strength. If the amount of C is less than 0.60%, a non-pearlite structure such as grain boundary ferrite is produced; consequently, wire drawability is impaired, and the tensile strength of an ultra-thin steel wire is reduced. On the other hand, if the amount of C is more than 1.10%, a non-pearlite structure such as pro-eutectoid cementite is produced, and wire drawability is degraded. Thus, the amount of C is limited in the range of 0.60 to 1.10%. The amount of C is preferably set to 0.65% or more.
  • Si is an element used for the deoxidation of steel, and also contributes to solid solution strengthening. To obtain the effect, 0.02% or more Si is added.
  • the amount of Si is preferably set to 0.05% or more.
  • the upper limit is set to 2.0%.
  • the amount of Si is set to preferably 1.0% or less, and more preferably 0.5% or less.
  • Mn is an element used for deoxidation and desulfurization, and the added amount is 0.1 % or more. On the other hand, if the amount of Mn is more than 2.0%, pearlite transformation is significantly delayed, and the time of patenting treatment is increased; thus, the amount of Mn is set to 2.0% or less.
  • the amount of Mn is preferably 1.0% or less.
  • Cr is an element that makes the prior ⁇ grain size fine and makes the pearlite structure fine, and also contributes to strength increasing. To obtain the effect, 0.3% or more of Cr is added. On the other hand, if the amount of Cr is more than 1.6%, pro-eutectoid cementite is precipitated, and wire drawability is reduced; thus, the upper limit is set to 1.6%.
  • the upper limit is preferably set to 1.3% or less.
  • the upper limit is more preferably set to 1.0% or less.
  • Al is an element having deoxidation action, and is needed to reduce the amount of oxygen in steel. However, if the Al content is less than 0.001%, this effect is hardly obtained. On the other hand, Al is likely to form a hard oxide-based inclusion; in particular, if the Al content is more than 0.05%, the formation of coarse oxide-based inclusions is significant, and consequently the reduction in wire drawability is significant. Thus, the Al content is set to 0.001 to 0.05%. A preferred lower limit is 0.01% or more, and a preferred upper limit is 0.04% or less.
  • N is an element that, during wire drawing in cold working, adheres to a dislocation to improve the strength of the steel wire, but reduces wire drawability.
  • the N content is more than 0.008%, the reduction in wire drawability is significant.
  • the N content is limited to 0.008% or less.
  • the N content is preferably 0.005% or less.
  • P is likely to be segregated in steel; when P is segregated, eutectoid transformation is significantly delayed, and consequently eutectoid transformation is less likely to be completed and hard martensite is likely to be formed. To prevent this, the P content is limited to 0.02% or less.
  • the S content is limited to 0.020% or less.
  • the S content is preferably 0.01% or less.
  • Mo is optional.
  • Mo is added, there is an effect of enhancing the tensile strength of the steel wire rod.
  • the Mo content is preferably 0.02 to 0.20%. It is more preferably 0.08% or less.
  • V is optional.
  • V When V is added, the V forms a carbonitride in the steel wire rod, and reduces the pearlite block size and improves wire drawability. To obtain this effect, it is desirable to add 0.02% or more of V.
  • the V content is preferably 0.02 to 0.20%. It is more preferably 0.08% or less.
  • Nb is optional.
  • the Nb forms a carbonitride in the steel wire rod, and reduces the pearlite block size and improves wire drawability.
  • the Nb content is preferably 0.002 to 0.05%. It is more preferably 0.02% or less.
  • Ti is optional.
  • the Ti forms a carbide or a nitride in the steel wire rod, and reduces the pearlite block size and improves wire drawability.
  • the Ti content is preferably set to 0.02 to 0.05%. It is more preferably 0.03% or less.
  • B is optional.
  • the B forms BN out of solid solution N in the steel wire rod, and reduces the amount of solid solution N in the steel and improves wire drawability.
  • the B content is preferably 0.0003 to 0.003%. It is more preferably 0.002% or less.
  • a non-pearlite structure such as pro-eutectoid ferrite or pro-eutectoid cementite is a cause of the occurrence of a crack during the final wire drawing.
  • the area ratio of pearlite is set to 95% or more in order to enhance wire drawability.
  • the balance is non-pearlite structures such as pro-eutectoid ferrite and pro-eutectoid cementite.
  • the metal structure mentioned above can be identified by taking, as a sample, a cross section of the wire rod in the direction perpendicular to the wire rod longitudinal direction, mirror-polishing the cross section, and then observing the cross section with a scanning electron microscope.
  • the area ratio of each metal structure can be found from the observation result obtained with a scanning electron microscope using the planar segmentation method or the point counting method.
  • the observation magnification is preferably set to, for example, 1000 times or more, and the observation area is preferably set to, for example, 1000 ⁇ m 2 or more.
  • the area ratio is identified by, for example, the point counting method, the number of measurement points is preferably set to 200 or more.
  • the block size of pearlite (hereinafter, occasionally referred to as a pearlite block size) is larger than 15 ⁇ m, wire drawability is reduced; thus, the pearlite block size is set to 15 ⁇ m or less. It is preferably 12 ⁇ m or less. Further, if the pearlite block size is 5 ⁇ m or less, the amount of non-pearlite structures is increased; thus, the lower limit is set to 5 ⁇ m.
  • the degree of accumulation of ferrite crystal orientations ⁇ 110> at which this effect is significant is set to 1.3 or more. It is preferably 1.5 or more, and more preferably 1.7 or more.
  • the pearlite block size and the degree of accumulation of ferrite crystal orientations ⁇ 110> can be identified by an EBSD method like that mentioned above.
  • the metal structure in the present invention is mainly formed of pearlite; it is aimed to achieve, as the tensile strength of the steel wire rod, 1300 MPa or more, preferably 1350 MPa or more, and more preferably 1400 MPa or more.
  • the average lamellar spacing of pearlite shown in Examples described later needs to be 100 nm or less. If the average lamellar spacing of pearlite is less than 50 nm, the bainite structure other than pearlite coexists, and the target strength is not obtained and the rate of wire drawing hardening is reduced; thus, the lower limit is set to 50 nm.
  • a steel wire rod of the present invention is produced by smelting and casting steel containing the components mentioned above by the usual method and performing hot rolling on the resulting steel piece.
  • the hot rolling is performed while the steel piece is heated to approximately 1150°C.
  • the finishing temperature of hot rolling is 740 to 880°C.
  • cooling (the primary cooling) is performed by a means such as air blast cooling, mist cooling, or water cooling at 25°C/sec to 40°C/sec until the temperature reaches 550°C to 650°C, the temperature is kept in the range of these temperatures for 30 seconds to 180 seconds, then cooling (the secondary cooling) is performed by a means such as air cooling or water cooling at 2°C/sec or more up to 300°C, and cooling is performed up to room temperature by a means such as allowing to cool.
  • the diameter of the wire rod is not particularly limited as long as work hardening needed when the wire rod is made into a steel wire can be ensured.
  • the finishing temperature of hot rolling if it is higher than 880°C, the effect of making the prior ⁇ grain size fine is reduced; thus, it is set to 880°C or less. Further, if rolling is performed at less than 740°C, pro-eutectoid ferrite may be precipitated during rolling; thus, the lower limit is set to 740°C.
  • the cooling rate in the primary cooling if it is less than 25°C/sec, the prior ⁇ grain size is made coarse; thus, the lower limit is set to 25°C/sec. Cooling at more than 40°C/sec is difficult in the actual production; thus, the cooling rate is set to 40°C/sec or less.
  • the holding temperature if it is more than 650°C, the prior ⁇ grain size is made coarse, and the strength is reduced; thus, the upper limit is set to 650°C. Further, if the holding temperature is less than 550°C, the amount of non-pearlite structures is increased; thus, the lower limit is set to 550°C.
  • the lower limit is set to 30 seconds.
  • the upper limit is set to 180 seconds.
  • the lower limit of the cooling rate of the secondary cooling up to 300°C is set to 2°C/sec.
  • the cooling rate of the cooling from 300°C to room temperature is not limited.
  • the steel wire rod and the method for producing a steel wire rod according to an embodiment of the present invention will now be specifically described with reference to Examples. Examples shown below are only examples of the steel wire rod and the method for producing a steel wire rod according to an embodiment of the present invention, and the steel wire rod and the method for producing a steel wire rod according to the present invention are not limited to the examples described below.
  • wire rods that had the pearlite structure in common but in which the pearlite block size of the central portion, the degree of accumulation of ferrite crystal orientations ⁇ 110> of the outer layer portion, and the tensile strength were variously different were produced by changing the hot rolling conditions shown in Table 2. These wire rods were evaluated with the wire drawing critical strain. The results are shown in Table 3.
  • the wire rod after finishing the hot rolling mentioned above was subjected to the jetting of cooling water from nozzles in a cooling zone provided on a rolling-line, and was immediately cooled to a temperature in the range of 550°C to 650°C. At this time, the amount of water and the time of water cooling were changed to control the peak temperature. Further, the wire rod was subjected to air blast cooling to be cooled at a cooling rate of 5°C/sec to 25°C/sec to a temperature in the range of 650°C to 550°C. After that, the wire rod was held in the range of these temperatures for approximately 60 seconds to complete pearlite transformation, and was cooled by air cooling up to room temperature.
  • the pearlite area ratio (%), the pearlite block size, the lamellar spacing, the ferrite crystal orientation, and the tensile strength of these steel wire rods were measured.
  • the pearlite area ratio was found by cutting the wire rod and mirror-polishing a transverse cross section thereof to prepare a sample, etching the sample with a mixed liquid of nitric acid and ethanol, and observing a central portion between the surface and the center of the wire rod at a magnification of 2000 times.
  • the pearlite block size and the lamellar spacing were measured in an area of 62,500 ⁇ m 2 within 5 mm around the center of the steel wire rod.
  • the degree of accumulation of ferrite orientations ⁇ 110> was measured in an area of 62,500 ⁇ m 2 within 500 ⁇ m from the outer layer using an EBSD measuring apparatus manufactured by TSL Solutions K.K.
  • the tensile test was performed in accordance with JIS Z 2241.
  • the wire drawability was evaluated by performing dry wire drawing in the above manner, plotting the relationship between the wire drawing true strain and the cumulative rate of breaking, with the total number of times of wire breaking set to 20, and taking, as the evaluation value, the wire drawing true strain at which the cumulative rate of breaking was 50%.
  • the results are shown in Table 3.
  • PBS represents the average of the pearlite block size.
  • the holding time is short, and the secondary cooling is performed before pearlite transformation is completed; consequently, the pearlite area ratio is small, and the wire drawing critical strain is small.
  • the primary cooling rate is small, and the prior ⁇ grain size is made coarse; consequently, the pearlite block size is large, and the wire drawing critical strain is small.
  • the secondary cooling rate is small; the shape of lamellar pearlite is spoiled, and the tensile strength is reduced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP15865720.5A 2014-12-05 2015-12-02 Fil machine en acier à haute teneur en carbone présentant d'excellentes propriétés de tréfilage Withdrawn EP3228721A4 (fr)

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JP2014247258 2014-12-05
PCT/JP2015/083879 WO2016088803A1 (fr) 2014-12-05 2015-12-02 Fil machine en acier à haute teneur en carbone présentant d'excellentes propriétés de tréfilage

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EP3228721A1 true EP3228721A1 (fr) 2017-10-11
EP3228721A4 EP3228721A4 (fr) 2018-07-11

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EP (1) EP3228721A4 (fr)
JP (1) JP6394708B2 (fr)
KR (1) KR101952527B1 (fr)
CN (1) CN107208208B (fr)
MX (1) MX2017006990A (fr)
WO (1) WO2016088803A1 (fr)

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EP3936629A4 (fr) * 2019-03-06 2024-04-24 Nippon Steel Corporation Tôle d'acier laminée à chaud et procédé de production s'y rapportant
US12534772B2 (en) * 2019-03-06 2026-01-27 Nippon Steel Corporation Hot rolled steel sheet and method for producing same
EP4060073A4 (fr) * 2019-12-20 2024-01-03 Posco Fil-machine porteur et procédé de fabrication associé
US12534787B2 (en) 2020-03-02 2026-01-27 Nippon Steel Corporation Hot rolled steel sheet
WO2024251972A1 (fr) * 2023-06-09 2024-12-12 Nv Bekaert Sa Patentage isotherme de fils d'acier

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CN107208208B (zh) 2019-08-23
CN107208208A (zh) 2017-09-26
WO2016088803A1 (fr) 2016-06-09
EP3228721A4 (fr) 2018-07-11
MX2017006990A (es) 2017-08-24
KR101952527B1 (ko) 2019-02-26
JPWO2016088803A1 (ja) 2017-10-05
KR20170092630A (ko) 2017-08-11

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