EP3396006B1 - Heisspressformteil mit reduzierter mikrorissbildung und verfahren zur herstellung davon - Google Patents

Heisspressformteil mit reduzierter mikrorissbildung und verfahren zur herstellung davon Download PDF

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Publication number
EP3396006B1
EP3396006B1 EP16879309.9A EP16879309A EP3396006B1 EP 3396006 B1 EP3396006 B1 EP 3396006B1 EP 16879309 A EP16879309 A EP 16879309A EP 3396006 B1 EP3396006 B1 EP 3396006B1
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Prior art keywords
zinc
steel sheet
plated layer
based plated
hot press
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EP16879309.9A
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English (en)
French (fr)
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EP3396006A4 (de
EP3396006A1 (de
Inventor
Hyeon-Seok HWANG
Il-Ryoung Sohn
Jong-Sang Kim
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Posco Holdings Inc
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Posco Co Ltd
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    • 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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment

Definitions

  • the present disclosure relates to a microcrack reduced hot press-formed article and a method for manufacturing the same.
  • HPF hot press forming
  • Hot press forming is a method of machining a steel sheet to have a complicated shape at high temperatures by utilizing the properties of the steel sheet, soft-nitrides, having high ductility at high temperature. More specifically, in a state in which a steel sheet is heated to an austenite region or greater, the steel sheet is machined and rapidly quenched simultaneously to transform the structure of the steel sheet into martensite, thus producing a product having high strength and a precise shape.
  • plated steel materials having a zinc-based or aluminum-based plated layer formed on a surface thereof are commonly used as materials for hot press forming.
  • a galvanized steel sheet having a zinc-based plated layer is a steel material having corrosion resistance improved using the self-sacrificial corrosion resistance of zinc.
  • Patent document 1 U.S. Patent Publication No. 6296805 proposes a technique of performing Al-based plating on a surface of a steel sheet.
  • Al-based plating As Al-based plating is performed, an oxidation reaction on a surface of the steel sheet is suppressed, while the plated layer is maintained in a heating furnace, and formation of a passivation film of Al is used to increase corrosion resistance, but corrosion resistance of the Al plated steel sheet is drastically lowered.
  • WO 2012/139769 A1 discloses a hot-formable steel sheet (e.g. 22MnB5), comprising a Zn-based coating, preferably galvannealed.
  • WO 2014/166630 A1 discloses an article produced by hot-forming a metal-coated steel (e.g. a GA130 22MnB5), the Zn-based coating preferably comprising 1.0-2.5 wt.% Al, 1.0-2.5 wt.% Mg.
  • the hot-formed article has improved bendability and good resistance against micro-cracks.
  • US 4 383 006 A discloses a hot-dip galvanized steel with zero-spangle and excellent resistance to age-flaking.
  • the coating comprises 0.1-0.2 wt.% Al, 0.1-0.5 wt.% Sb and Zn as the balance.
  • microcracks are formed even in a surface of the base steel sheet, due to a high temperature working environment in which a temperature of the plated steel exceeds 900°C and stress caused by friction between a Zn-Fe alloyed layer alloyed during hot press forming and a die.
  • Such microcracks may act as a starting point for the propagation of cracks in the base steel sheet or cause fatigue cracks, which may decrease durability of parts.
  • An aspect of the present disclosure is to provide a microcrack reduced hot press-formed article and a method for manufacturing the same.
  • a hot press-formed article is manufactured by hot press forming a galvanized steel sheet including a base steel sheet and a zinc-based plated layer formed on a surface of the base steel sheet, wherein the zinc-based plated layer includes at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05 to 2.0 wt%, and further includes 0.1 to 5.0 wt% of Mg and 0.1 to 5.0 wt% of Al, a balance of Zn, and inevitable impurities, and at least 70 wt% of the at least one element selected from the group consisting of Sb, Sn, Bi is concentrated in a region 3 ⁇ m or less away from a surface of an alloyed zinc-based plated layer, formed by alloying the zinc-based plated layer, of the hot press-formed article, wherein a degree of alloying of Fe of the alloyed zinc-based plated layer is 30 to 85%.
  • a method for manufacturing a hot press-formed article includes: preparing a zinc-based plated steel sheet; primarily heating the zinc-based plated steel sheet to a temperature of 640 to 680°C at a rate of 3.5 to 4.2°C/sec; secondarily heating the primarily-heated zinc-based plated steel sheet to a temperature of 900 to 930°C at a rate of 1.1 to 1.6°C/sec; maintaining the secondarily-heated zinc-based plated steel sheet at a constant temperature for 1 to 5 minutes; and molding the zinc-based plated steel sheet maintained at the constant temperature with a die and simultaneously quenching the steel sheet, wherein the zinc-based plated steel sheet includes a base steel sheet and a zinc-based plated layer formed on a surface of the base steel sheet and including at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05 to 2.0 wt%, and further includes 0.1
  • microcracks in a plated layer caused during hot press forming is effectively restrained from propagating to the base steel sheet, obtaining excellent durability.
  • the inventors of the present application have conducted research in depth to provide a hot press formed article with suppressed microcracks and resultantly discovered that propagation of microcracks in a plated layer to a base steel sheet could be effectively blocked by using a galvanized steel sheet having a zinc-based plated layer containing a proper amount of grain, a boundary segregation element as a material for hot press forming and concentrating the boundary segregation element on a surface layer of a plated layer by appropriately controlling heating conditions during the hot press forming, thus completing the present disclosure.
  • the hot press formed article as one aspect of the present disclosure is manufactured by hot press forming a galvanized steel sheet including a base steel sheet and a zinc-based plated layer formed on a surface of the base steel sheet to hot press molding.
  • the kind of the base steel sheet is not limited and may be, for example, a hot-rolled steel sheet or a cold-rolled steel sheet used as a base of a general galvanized steel sheet.
  • a hot-rolled steel sheet a large amount of oxide scale is present on a surface thereof. Such an oxide scale lowers plating adhesion to deteriorate quality of plating, and thus, a hot-rolled steel sheet whose oxide scale has previously been removed by an acid solution may be used as a base.
  • the zinc-based plated layer is formed on one side or both sides of the base steel sheet, and the zinc-based plated layer is alloyed at the time of heat treatment for hot press forming to change into an alloyed zinc-based plated layer.
  • the zinc-based plated layer may include at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05% to 2.0% by weight, 0.1 to 5.0 wt% of Mg and 0.1 to 5.0 wt% of Al, a balanced amount of Zn, and inevitable impurities.
  • Sb, Sn, and Bi are grain boundary segregation elements serving to inhibit formation of an internal oxide due to penetration of oxygen into the grain boundary in a high-temperature working environment.
  • the sum of the contents of the above elements is 0.05 wt% or greater, and more preferably 0.3 wt% or greater.
  • the sum of the contents of the above elements is 2.0 wt% or less, more preferably 1.5 wt% or less.
  • the zinc-based plated layer further contains 0.1 to 5.0 wt% of Mg and 0.1 to 5.0 wt% of Al.
  • Mg is an element serving to improve corrosion resistance of a hot press-formed article.
  • the Mg content is 0.1 wt% or greater, and preferably 1 wt% or greater.
  • an upper limit of the magnesium content is 5.0 wt%, preferably 4.0 wt%, and more preferably 3.0 wt%.
  • Al serves to suppress Mg oxide dross. If the Al content is too low, the effect of preventing Mg oxidation in the plating bath may be insignificant. Therefore, a lower limit of the aluminum content is 0.1 wt%, and preferably 1.5 wt%. However, if the Al content is too excessive, a temperature of the plating bath must be increased. If the temperature of the plating bath is high, the plating facility may be eroded. Therefore, an upper limit of the aluminum content is 5.0 wt%.
  • a degree of alloying of Fe of the alloyed zinc-based plated layer formed by alloying the zinc-based plated layer is 30 to 85%, preferably 45 to 78%, and more preferably 50 to 75%.
  • the degree of alloying of Fe satisfies the above range, surface cracking during hot pressing may be effectively prevented and corrosion resistance characteristics based on sacrificial corrosion prevention is excellent.
  • the degree of alloying of Fe is less than 30%, a region of the plated layer in which a part of Zn is concentrated may exist in a liquid phase, causing a liquid embrittlement cracks during processing. Meanwhile, if the degree of alloying of Fe degree exceeds 85%, corrosion resistance may be lowered.
  • the hot pressed-formed article of the present disclosure features that at least 70 wt% of at least one element selected from the group consisting of Sb, Sn, and Bi is concentrated in a region 3 ⁇ m or less away from a surface of the alloyed zinc-based plated layer.
  • Sb, Sn and Bi When Sb, Sn and Bi are concentrated in a large amount on the surface of the alloyed zinc-based plated layer as described above, Sb, Sn and Bi may settle on the surface of the plated layer before oxygen penetrates from the surface of the plated layer to cause grain boundary segregation to restrain formation of internal oxide to prevent formation of boundary cracks in the plated layer, thus blocking propagation of microcracks to the base member. Furthermore, microcracks are mainly formed in a location where friction between the mold and the plated layer is severe. The oxide of Sb, Sn, and Bi concentrated on the surface may reduce a coefficient of friction between the mold and the plated layer to reduce formation of microcracks, thus improving durability of the hot press-formed article.
  • a specific method of measuring the content of at least one element selected from the group consisting of Sb, Sn, and Bi concentrated in a region 3 ⁇ m or less away from the surface of the alloyed zinc-based plated layer is not particularly limited, but the following method may be used.
  • a distribution of at least one element selected from the group consisting of Sb, Sn, and Bi in the cross-section of the plated layer may be measured using a glow discharge emission spectrometry (GDS), and an area thereof is integrated in a graph related to the content of at least one element selected from the group consisting of Sb, Sn, and Bi relative to the depth from the surface of the plated layer, whereby the content of at least one element selected from the group consisting of Sb, Sn, and Bi concentrated in the region 3 ⁇ m or less away from the surface of the alloyed zinc-based plated layer may be measured.
  • GDS glow discharge emission spectrometry
  • the hot press-formed article of the present disclosure described above may be manufactured by various methods, and the manufacturing method is not particularly limited. However, the hot press-formed article may be manufactured by the following method as one embodiment.
  • a galvanized steel sheet having the above-described alloy composition is prepared.
  • a specific method for preparing a zinc-based plated steel sheet is not particularly limited.
  • the galvanized steel sheet may be manufactured by a general method of manufacturing a hot dip galvanized steel sheet.
  • a base steel sheet may be dipped in a zinc-based plating bath having the above-described composition and subsequently cooled to prepare the galvanized steel sheet.
  • the inert gas may be one or more selected from the group consisting of nitrogen (N 2 ), argon (Ar), and helium (He).
  • Performing bubbling in the zinc-based plating bath prior to performing the plating as described above may help uniformly distribute Sb, Sn, and Bi in the zinc-based plating bath, help evenly distribute Sb, Sn, and Bi in the zinc-based plated layer obtained by a plating operation (to be described hereinafter), and help concentrate Sb, Sn, and Bi on the surface of the alloyed zinc-based plated layer of the hot press-formed article which is resultantly obtained. This is because as the distribution of Sb, Sn, and Bi in the plated layer prior to heating for hot press forming is uniform, Sb, Si, and Bi may be easily concentrated on the surface.
  • supply of the inert gas is preferably maintained for 1 hour or greater, and more preferably for 3 hours or greater. Meanwhile, an increase in the supply time of the inert gas may be advantageous to evenly distribute the components in the plating bath, and thus, an upper limit is not particularly limited.
  • the zinc-based plated steel sheet is primarily-heated to be processed into an article. This operation is performed in order to sufficiently impart the zinc content of the plated layer in a follow-up heating process by increasing a melting point by performing alloying with iron before zinc of the plated layer is oxidized in the atmosphere
  • an average heating rate is 3.5 to 4.2°C/sec. If the average heating rate is lower than 3.5°C/sec, a rise time may be prolonged to delay the effect of the increase in the melting point due to alloying to cause excessive oxidation of zinc. Meanwhile, if the average heating rate exceeds 4.2°C/sec, zinc on the surface may be first melted earlier than alloying of the material to increase oxidation of the surface of the plated layer.
  • a primary heating end temperature is 640 to 680°C. If the temperature is lower than 640 °C, a diffusion coefficient in the plated layer may be too low due to the low temperature so the plated layer may not be uniformly alloyed. Meanwhile, if the temperature exceeds 680°C, the plated layer may be liquefied beyond the melting point of zinc delta and zinc may be vaporized to cause loss of the plated layer.
  • the primarily-heated zinc-based plated steel sheet is secondarily-heated. This operation is performed so that added internal oxidation inhibiting materials are first segregated to the grain boundary to prevent grain boundary oxidation due to oxygen to suppress microcracks, while stably changing the plated layer, sufficiently changed into delta phase, into Fe-alpha phase.
  • an average heating rate is 1.1 to 1.6°C/sec. If the average heating rate is less than 1.1°C/sec, an alloying time to the Fe-alpha phase may be prolonged to cause a possibility of grain boundary oxidation based on oxygen, rather than the grain boundary segregation element. Meanwhile, if the average heating rate exceeds 1.6°C/sec, partial plated layer liquefaction may occur on the surface of the plated layer at high temperatures to deteriorate quality due to a non-uniform surface.
  • a secondary heating end temperature is 900 to 930°C. If the temperature is lower than 900°C, sufficient austenite transformation of the material may not be achieved, making it difficult to secure strength of a final product. If the temperature exceeds 930°C, the plated layer may be entirely liquefied to degrade the microcrack suppressing effect based on the added grain boundary oxidation element.
  • the secondarily-heated zinc-based plated steel sheet is kept at the secondary heating end temperature for 1 to 5 minutes. If the holding time is less than 1 minute, it may be difficult to secure a sufficient time for the austenite transformation of the material due to the shortage of the total heating time. Meanwhile, if the holding time exceeds 5 minutes, the plated layer may be excessively alloyed to lower the zinc content in the plated layer to degrade corrosion resistance.
  • the secondarily-heated zinc-based plated steel sheet is molded by a die and quenched at the same time.
  • the molding and quenching by the die may be sufficient by the general hot press forming method, and therefore, it is not limited in the present disclosure.
  • each of the cooled plated steel materials was heated under the conditions shown in Table 2 below and hot press-formed to obtain a hot press-formed article.
  • Inventive Example 9 14 Bath 7 3.5 640 1.2 930 5 91 7.8 Inventive Example 10
  • 1 indicates the content (wt%) of at least one element selected from the group consisting of Sb, Sn, and Bi concentrated a region 3 ⁇ m or less away from the surface of the alloyed zinc-based plated layer
  • FIG. 1 shows observed microcracks of Comparative Example 1
  • FIG. 2 shows observed microcracks of Inventive Example 1
  • FIG. 3 shows observed microcracks of Inventive Example 3
  • FIG. 4 shows observed microcracks of Comparative Example 4
  • FIG. 5 shows observed microcracks of Inventive Example 5.
  • FIG. 6A is GDS data obtained by analyzing contents of Al, Mg, and Sn according to depths of a plated layer in Inventive Example 1
  • FIG. 6B is GDS data obtained by analyzing contents of Al, Mg, and Sn according to depths of a plated layer in Inventive Example 3
  • FIG. 6C is GDS data obtained by analyzing contents of Al, Mg, and Sn according to depths of a plated layer in Inventive Example 5.

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Claims (4)

  1. Heißpressformteil, das durch Heißpressformen eines galvanisierten Stahlblechs hergestellt ist, das ein Basisstahlblech und eine Überzugsschicht auf Zinkbasis umfasst, die auf einer Oberfläche des Basisstahlblechs ausgebildet ist,
    wobei die Überzugsschicht auf Zinkbasis mindestens ein Element, das aus der Gruppe ausgewählt ist, die aus Sb, Sn und Bi besteht, in einer Gesamtmenge von 0,05 bis 2,0 Gew.-% enthält, und darüber hinaus 0,1 bis 5,0 Gew.-% an AI und 0,1 bis 5,0 Gew.-% an Mg, einen Rest aus Zn und unvermeidbaren Verunreinigungen enthält, und
    mindestens 70 Gew.-% des mindestens einen Elements, das aus der Gruppe ausgewählt ist, die aus Sb, Sn und Bi besteht, in einem Bereich von 3 µm oder weniger von einer Oberfläche einer legierten Überzugsschicht auf Zinkbasis des Heißpressformteils weg konzentriert ist, die durch Legieren der Überzugsschicht auf Zinkbasis ausgebildet ist, und
    wobei ein Fe-Legierungsgrad der legierten Überzugsschicht auf Zinkbasis 30 bis 85 % beträgt.
  2. Heißpressformteil nach Anspruch 1,
    wobei die Überzugsschicht auf Zinkbasis mindestens ein Element, das aus der Gruppe ausgewählt ist, die aus Sb, Sn und Bi besteht, in einer Gesamtmenge von 0,3 bis 1,5 Gew.-% enthält.
  3. Verfahren zum Herstellen eines Heißpressformteils, wobei das Verfahren umfasst:
    Vorbereiten eines auf Zinkbasis beschichteten Stahlblechs;
    primäres Erwärmen des auf Zinkbasis beschichteten Stahlblechs auf eine Temperatur von 640 bis 680° C mit einer Rate von 3,5 bis 4,2° C/s;
    sekundäres Erwärmen des primär erwärmten, auf Zinkbasis beschichteten Stahlblechs auf eine Temperatur von 900 bis 930° C mit einer Rate von 1,1 bis 1,6° C/s;
    Halten des sekundär erwärmten, auf Zinkbasis beschichteten Stahlblechs auf einer konstanten Temperatur für 1 bis 5 Minuten; und
    Formen des auf der konstanten Temperatur gehaltenen, auf Zinkbasis beschichteten Stahlblechs mit einem Gesenk und gleichzeitiges Abschrecken des Stahlblechs,
    wobei das auf Zinkbasis beschichtete Stahlblech ein Basisstahlblech und eine Überzugsschicht auf Zinkbasis umfasst, die auf einer Oberfläche des Basisstahlblechs ausgebildet ist, und
    wobei die Überzugsschicht auf Zinkbasis mindestens ein Element, das aus der Gruppe ausgewählt ist, die aus Sb, Sn und Bi besteht, in einer Gesamtmenge von 0,05 bis 2,0 Gew.-% enthält, und darüber hinaus 0,1 bis 5,0 Gew.-% an AI und 0,1 bis 5,0 Gew.-% an Mg enthält.
  4. Verfahren nach Anspruch 3,
    wobei die Überzugsschicht auf Zinkbasis mindestens ein Element, das aus der Gruppe ausgewählt ist, die aus Sb, Sn und Bi besteht, in einer Gesamtmenge von 0,3 bis 1,5 Gew.-% enthält.
EP16879309.9A 2015-12-24 2016-12-21 Heisspressformteil mit reduzierter mikrorissbildung und verfahren zur herstellung davon Active EP3396006B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150186107A KR101726094B1 (ko) 2015-12-24 2015-12-24 미세크랙이 억제된 열간 프레스 성형품 및 그 제조방법
PCT/KR2016/014963 WO2017111442A1 (ko) 2015-12-24 2016-12-21 미세크랙이 억제된 열간 프레스 성형품 및 그 제조방법

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EP3396006A1 EP3396006A1 (de) 2018-10-31
EP3396006A4 EP3396006A4 (de) 2018-11-07
EP3396006B1 true EP3396006B1 (de) 2019-11-20

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US (2) US20190003031A1 (de)
EP (1) EP3396006B1 (de)
JP (1) JP6661772B2 (de)
KR (1) KR101726094B1 (de)
CN (1) CN108431286B (de)
WO (1) WO2017111442A1 (de)

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JP2019508575A (ja) 2019-03-28
US20190003031A1 (en) 2019-01-03
EP3396006A4 (de) 2018-11-07
EP3396006A1 (de) 2018-10-31
US20240082902A1 (en) 2024-03-14
WO2017111442A1 (ko) 2017-06-29
CN108431286A (zh) 2018-08-21
KR101726094B1 (ko) 2017-04-12
JP6661772B2 (ja) 2020-03-11

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