CN104136650A - 热压用钢板、其制造方法和使用该热压用钢板的热压部件的制造方法 - Google Patents
热压用钢板、其制造方法和使用该热压用钢板的热压部件的制造方法 Download PDFInfo
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- CN104136650A CN104136650A CN201380011181.1A CN201380011181A CN104136650A CN 104136650 A CN104136650 A CN 104136650A CN 201380011181 A CN201380011181 A CN 201380011181A CN 104136650 A CN104136650 A CN 104136650A
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- steel plate
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- steel sheet
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- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000007731 hot pressing Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 84
- 238000000576 coating method Methods 0.000 claims abstract description 84
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 28
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- 239000011701 zinc Substances 0.000 description 24
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- 239000002184 metal Substances 0.000 description 13
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- 230000000694 effects Effects 0.000 description 10
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- 229910052725 zinc Inorganic materials 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
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- 238000001816 cooling Methods 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910003962 NiZn Inorganic materials 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
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- 238000005204 segregation Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
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- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
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- 238000002441 X-ray diffraction Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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- 229910007573 Zn-Mg Inorganic materials 0.000 description 1
- 229910007564 Zn—Co Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 239000012153 distilled water Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
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- 230000006698 induction Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- 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
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- 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
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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
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- C21D1/673—Quenching devices for die quenching
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- C21—METALLURGY OF IRON
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
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- 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
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- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- C23C2/29—Cooling or quenching
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- C—CHEMISTRY; METALLURGY
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- 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
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- C23C2/40—Plates; Strips
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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
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
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- 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
- C21D2211/005—Ferrite
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
Abstract
本发明提供能切实地得到涂料密合性、耐腐蚀穿孔性、耐搭接腐蚀性优异的热压部件的热压用钢板、其制造方法及使用该热压用钢板的热压部件的制造方法。热压用钢板的特征在于,在钢板表面的平均铁素体粒径在20μm以下的钢板上具有附着量为10~90g/m2的Zn系镀层。
Description
技术领域
本发明涉及适合通过热压制造汽车的底盘部件、车体结构部件等的热压用钢板、其制造方法和使用该热压用钢板的热压部件的制造方法。
背景技术
以往,汽车的底盘部件、车体结构部件等大多是通过对具有规定强度的钢板进行冲压加工而制造的。近年来,从保护地球环境的观点出发,热切希望汽车车体轻量化,并持续进行着将所使用的钢板高强度化、降低其板厚的努力。但是,随着钢板的高强度化,其冲压加工性降低,因此,难以将钢板加工成所希望的部件形状的情况增多。
因此,在专利文献1中,提出了一种被称作热压的加工技术,即使用由冲模和冲头构成的金属模具来加工被加热的钢板,同时进行骤冷,从而能够兼顾加工容易化和高强度化。但是,在该热压中,由于在热压前将钢板加热到950℃左右的高温,因此,存在钢板表面会生成氧化皮(铁氧化物)、该氧化皮在热压时剥离、损伤金属模具或损伤热压后的部件表面的问题。此外,残留在部件表面的氧化皮也会成为外观不良和涂装密合性下降的原因。因此,通常进行酸洗或喷丸等处理来除去部件表面的氧化皮,但这会使制造工序复杂,导致生产效率降低。此外,汽车的底盘部件、车体结构部件等还需要有优异的耐腐蚀性,而通过上述那样的工序制得的热压部件由于没有设置镀层等防锈膜,因而耐腐蚀性非常不充分。
这样,希望有一种能够在热压前的加热时抑制氧化皮的生成、并能够提高热压后的部件的耐腐蚀性的热压技术,并且已经提出了一种表面上设有镀层等薄膜的钢板和使用该钢板的热压方法。例如,在专利文献2中,公开了一种对由Zn或Zn基合金覆盖的钢板进行热压、并在表面设置Zn-Fe基化合物或Zn-Fe-Al基化合物的耐腐蚀性优异的热压部件的制造方法。此外,专利文献3中公开了一种将合金化热镀Zn钢板在700~1000℃下加热2~20分钟后进行热压、表面设置有含Fe-Zn固溶相的镀层的、加工性、焊接性、耐腐性优异的热压成形品(部件)。
专利文献:
专利文献1:英国专利第1490535号公报
专利文献2:日本专利第3663145号公报
专利文献3:日本专利第4039548号公报
发明内容
然而,在用专利文献2中记载的方法制得的热压部件和专利文献3中记载的热压部件中,会有涂料密合性下降、或者对在化学处理膜、电沉积膜未覆盖的部位容易发生的穿孔腐蚀的耐腐蚀性(后面称作耐穿孔腐蚀性(perforation corrosionresistance))、钢板搭接部的耐腐蚀性(后面称作耐搭接腐蚀性(resistance to lap-jointcorrosion))下降的情况。
本发明旨在提供能高概率地得到涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性优异的热压部件的热压用钢板、其制造方法和使用该制造方法的热压部件的制造方法。
本发明者对上述目的热压用钢板进行了深入研究,获得以下发现。
i)专利文献2、3中记载的热压部件中的涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性下降的原因在于,在热压前的加热时生成的ZnO与钢板、Zn系镀层的界面上有空隙形成。
ii)要抑制该空隙的生成,使镀层的基底钢板表面的平均铁素体粒径在20μm以下是有效的。
本发明是根据这些发现作出的,旨在提供一种热压用钢板,其特征在于,在钢板平面的平均铁素体粒径在20μm以下的钢板上具有附着量为10~90g/m2的Zn系镀层。
本发明的热压用钢板中,优选Zn系镀层为含10~25质量%的Ni、余部由Zn和不可避免的杂质构成的镀层。
本发明的热压用钢板中,优选Zn系镀层中所含的η相的量在5质量%以下,更优选在2质量%以下。
此外,作为Zn系镀层的基底钢板,可以使用具有如下成分组成的钢板:以质量计,含有C:0.15~0.5%、Si:0.05~2.0%、Mn:0.5~3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下,余部由Fe和不可避免的杂质构成。
在该基底钢板中,优选以质量计进一步个别或同时含有选自Cr:0.01~1%、Ti:0.2%以下、B:0.0005~0.08%中的至少一种和/或Sb:0.003~0.03%。
本发明的热压用钢板能够通过在对具有上述成分组成的钢板进行760~840℃的热处理后形成附着量为10~90g/m2的Zn系镀层而制造。
本发明还提供一种热压部件的制造方法,其特征在于,将上述热压用钢板加热到Ac3相变点~1000℃的温度范围后进行热压。
根据本发明,可以制造能够高概率地得到涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性优异的热压部件的热压用钢板。使用本发明的热压用钢板、用本发明的热压部件的制造方法制得的热压部件,其外观良好,适合用于汽车的底盘部件、车体结构部件。
具体实施方式
1)热压用钢板
1-1)Zn系镀层
在本发明中,为了在热压前的加热时抑制氧化皮的生成,在钢板表面设置附着量为10~90g/m2的Zn系镀层。这里,使镀层的附着量(钢板的每个单面)为10~90g/m2是因为,小于10g/m2时,无法充分发挥Zn的牺牲性防蚀效果,超过90g/m2时,该效果饱和,导致成本上升。
作为Zn系镀层,除纯Zn镀层(例如用电镀锌线、热镀锌线形成的镀层)外,还可以是Zn-Ni合金镀层、Zn-Fe合金镀层(用热镀锌线实施过合金化处理的镀层)、Zn-Cr合金镀层、Zn-Mn合金镀层、Zn-Co合金镀层、Zn-Cr-Ni合金镀层、Zn-Cr-Fe合金镀层、Zn-Cr-Co合金镀层、Zn-Al合金镀层(例如Zn-5%Al镀层和Zn-55%Al镀层)、Zn-Mg合金镀层、Zn-Al-Mg合金镀层(例如Zn-6%Al-3%Mg镀层和Zn-11%Al-3%Mg镀层)等。此外,还可使用使金属氧化物、聚合物等分散在这种Zn系镀层中形成的Zn系复合镀层(例如Zn-SiO2分散镀层),也可以是将这种Zn系镀层多个层叠形成的镀层。
尤其优选Ni含有率为10~25质量%的Zn-Ni合金镀层。这是由于,在该Zn-Ni合金系中会形成具有Ni2Zn11、NiZn3、Ni5Zn21中的任一种结晶结构的、熔点高、为881℃的γ相,从而能够将热压前的加热时的氧化皮、ZnO的生成反应抑制到最小限度。此外,由于熔点高,热压时镀层成分向铁素体颗粒内的扩散速度被抑制,镀层的减少变小,从而使耐腐蚀性的劣化减少。此外,由于加热时不会形成Zn-Fe金属化合物,因此,伴随开裂而发生的氧化皮的生成也被抑制。而且,在热压完成后,镀层仍以γ相残存,因此,可通过Zn的牺牲性防蚀效果而发挥优异的耐腐蚀性。不过,Ni含有率为10~25质量%时的γ相的形成不一定和Ni-Zn合金的平衡状态图一致。这可能是由于用电镀法等进行的镀层形成反应是非平衡进行的。Ni2Zn11、NiZn3、Ni5Zn21的γ相可以通过X射线衍射法、使用TEM(透射电子显微镜)的电子射线衍射法进行确认。此外,通过使镀层的Ni含有率为10~25质量%,如上所述,会形成γ相。但是,视电镀的条件等,除γ相外,有时还会多少混有η相。此时,为了将加热时的ZnO生成反应抑制到最小限度,优选η相的量在5质量%以下。更优选η相的量在2质量%以下。这是因为,在2质量%以下时,能够抑制上述ZnO的生成,并能够抑制热压时镀层向金属模具的附着,实现连续热压时减少对材料的再附着和金属模具的维修。η相的量用η相相对于镀层总重量的重量比来定义,例如可以通过阳极溶解法进行定量。
对这种镀层的形成方法无特殊限制。镀层的形成方法可以使用公知的电解法(水溶液中和非水溶液中的电解)、熔融法、气相法等。
1-2)基底钢板的成分组成
要得到具有980MPa以上强度的热压部件,作为镀层的基底钢板,例如可以使用具有以质量%计含有C:0.15~0.5质量%、Si:0.05~2.0%、Mn:0.5~3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下、余部由Fe和不可避免的杂质构成的成分组成的热轧钢板和冷轧钢板。下面对各成分元素的限定理由进行说明。这里,除非另有说明,表示成分含量的“%”是指“质量%”。
C:0.15~0.5%
C是提高钢的强度的元素,要使热压部件的TS在980MPa以上,必须使C量在0.15%以上。另一方面,C量超过0.5%时,素材钢板的冲裁加工性显著下降。因此,将C量设为0.15~0.5%。
Si:0.05~2.0%
Si与C一样,是提高钢的强度的元素,要使热压部件的TS在980MPa以上,必须使Si量在0.05%以上。另一方面,Si量超过2.0%时,热轧时被称作红色氧化皮的表面缺陷的发生显著增大,且轧制载荷增大,导致热轧钢板的延展性劣化。此外,Si量超过2.0%时,在实施将以Zn、Al为主体的镀膜形成在钢板表面的镀敷处理时,有时会对镀敷处理性造成不良影响。因此,将Si量设为0.05~2.0%。
Mn:0.5~3%
Mn是对抑制铁素体相变、提高淬火性有效的元素,此外,由于能使Ac3相变点降低,因而还是对降低热压前的加热温度有效的元素。要显现出这种效果,必须使Mn量在0.5%以上。另一方面,Mn量超过3%时,会产生偏析,导致素材钢板和热压部件的特性均匀性下降。因此,将Mn量设为0.5~3%。
P:0.1%以下
P量超过0.1%时,会产生偏析,导致素材钢板和热压部件的特性均匀性下降,并且韧性也会显著降低。因此,将P量设在0.1%以下。
S:0.05%以下
S量超过0.05%时,热压部件的韧性降低。因此,将S量设在0.05%以下。
Al:0.1%以下
Al量超过0.1%时,会降低素材钢板的冲裁加工性和淬火性。因此,将Al量设在0.1%以下。
N:0.01%以下
N量超过0.01%时,在热轧时、热压前的加热时会形成AlN的氮化物,导致素材钢板的冲裁加工性和淬火性降低。因此,将N量设在0.01%以下。
余部为Fe和不可避免的杂质。根据以下理由,优选余部个别或同时含有选自Cr:0.01~1%、Ti:0.2%以下、B:0.0005~0.08%中的至少一种和/或Sb:0.003~0.03%。
Cr:0.01~1%
Cr不仅能强化钢,而且是对提高淬火性有效的元素。要显现这种效果,优选将Cr量设在0.01%以上。另一方面,若Cr量在1%以下,则不会导致显著的成本提高,因而优选将其上限设为1%。
Ti:0.2%以下
Ti不仅能强化钢,而且是对通过细粒化提高韧性有效的元素。此外,Ti还是会比接下来描述的B优先形成氮化物、对发挥固溶B的提高淬火性的效果有效的元素。要显现这种效果,优选将Ti量设在0.02%以上。另一方面,若Ti量在0.2%以下,则热轧时的轧制载荷不会极端地增大,且热压部件的韧性不会降低,因而优选将Ti的上限设为0.2%。
B:0.0005~0.08%
B是对提高热压时的淬火性和热压后的韧性有效的元素。要显现这种效果,优选将B量设在0.0005%以上。另一方面,若B量在0.08%以下,则热轧时的轧制载荷不会极端地增大,此外,热轧后不会生成马氏体相和贝氏体相,不会出现钢板开裂等,因此将B的上限设为0.08%。
Sb:0.003~0.03%
Sb具有抑制在从热压前对钢板进行加热起到通过热压的一系列处理对钢板进行冷却之间的期间里在钢板表层部产生的脱碳层的效果。要显现这种效果,优选将Sb的量设在0.003%以上。另一方面,若Sb量在0.03%以下,则不会导致轧制载荷的增大,不会降低生产效率。因此,优选将Sb量设为0.003~0.03%。
1-3)基底钢板的组织
如上述那样,表面上设置有Zn系镀层的热压部件的涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性降低的原因在于,在热压前的加热时生成的ZnO与钢板和Zn系镀层的界面上形成有空隙。要抑制该空隙的生成,使基底钢板表面的平均铁素体粒径在20μm以下是有效的。据认为,这是由于,若使铁素体粒径在20μm以下,则加热时镀层成分向铁素体粒内的扩散发生在铁素体粒内整个区域,镀层的残存大致均匀地减少。其结果,在形成在镀层表层的ZnO与钢板、镀层之间,空隙减少。另外,平均铁素体粒径用如下方法求算。制作为钢板板厚方向的截面且与轧制方向成直角方向的截面的研磨试样,通过显微镜观察,在400倍下拍摄钢板表面部的照片。由该图像,根据JIS G 0552的切割法,通过图像处理算出钢板表面附近的、与钢板板厚方向成直角的方向上的任意直线上的铁素体粒子数,求出平均值。
另一方面,平均铁素体粒径超过20μm时,镀层成分向铁素体粒内的扩散不会向前进行,扩散仅停留在铁素体粒与镀层接触的表面附近。这样,残存的镀层因加热温度而熔融、凝集,导致残存的镀层呈不均匀的状态。其结果,形成在镀层表层的ZnO也呈不均匀的状态,该ZnO与钢板、镀层之间的空隙增大,因而不宜。
此外,通过使成为镀层与基底钢板之间的界面的钢板表面的铁素体粒径在20μm以下,并与熔点高的Zn-Ni合金镀层(含10~25质量%的Ni,余部由Zn和不可避免的杂质构成)组合,抑制伴随在热压时的高温环境下发生的镀层熔融而出现的ZnO生成、提高镀层残存的效果尤其会增大。此外,能够使镀层成分向铁素体粒内扩散大致均一化的效果也会增大。这样,通过使成为镀层与基底钢板之间的界面的钢板表面的铁素体粒径在20μm以下,并与熔点高的Zn-Ni合金镀层(含10~25质量%的Ni,余部由Zn和不可避免的杂质构成)组合,还能提高涂料密合性、耐穿孔腐蚀性和耐搭接腐蚀性。
另外,钢板表面如上所述,是指镀层与基底钢板之间的界面,在观察板厚方向的截面时,是形成有镀层时与镀膜最下层接触的钢板的最表层部。
要使基底钢板表面的平均铁素体粒径在20μm以下,在Zn系镀层的形成前,对具有上述成分组成的钢板实施760~840℃的热处理即可。
2)热压部件的制造方法
上述本发明的热压用钢板在加热到Ac3相变点~1000℃的温度范围后经热压,成为热压部件。在热压前加热到Ac3相变点以上是为了通过热压时的骤冷形成马氏体相等硬质相,实现部件的高强度化。此外,将加热温度的上限设为1000℃是因为,超过1000℃时,会在镀层表面生成大量的ZnO。另外,这里所说的加热温度是指钢板的最高到达温度。
对热压前的加热时的平均升温速度无特殊限制,例如2~200℃/s是适宜的。钢板暴露在高温条件下的高温滞留时间越长,镀层表面的ZnO生成、ZnO与钢板、镀层之间的空隙的生成、镀层缺陷部中的局部氧化皮的生成越增大,因而平均升温速度越快越好。此外,对最高到达板温下的保持时间无特殊限制,按与上述同样的理由,以短时间为宜,优选在300s以下,更优选在120s以下,尤其优选在10s以下。
作为热压前的加热方法,可以列举利用电炉、煤气炉等进行的加热、火焰加热、通电加热、高频加热、感应加热等。
实施例
作为基底钢板,使用了具有以质量计含有C:0.23%、Si:0.25%、Mn:1.2%、P:0.01%、S:0.01%、Al:0.03%、N:0.005%、Cr:0.2%、Ti:0.02%、B:0.0022%、Sb:0.008%,余部由Fe和不可避免的杂质构成的成分组成,Ac3相变点为820℃、板厚1.6mm的冷轧后状态的钢板。对该冷轧后状态的钢板通过改变温度实施退火,制得钢板表面的平均铁素体粒径不同的冷轧钢板。
在退火后的冷轧钢板的表面上,利用电镀法、热镀法制得具有表1所示的镀种、附着量、Ni含有率的镀层的钢板No.1~32。
将这样得到的钢板No.1~32在通过电炉或直接通电在表1所示的加热条件下加热后,用Al制金属模具包夹,在冷却速度50℃/s下冷却,模拟热压。
用以下方法考查了基底钢板表面的平均铁素体粒径和模拟了热压的钢板的涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性及耐金属模具附着性。
平均铁素体粒径:对退火后、镀敷处理前的冷轧钢板的板厚截面进行研磨,用硝醇液浸蚀后,从3个视角拍摄最表层部的显微镜照片(倍率400倍),在各视角下,通过图像解析,按照JIS G0552的切割法测定最表面的铁素体粒径,求出3视角的平均值,以此作为平均铁素体粒径。
涂装密合性:从模拟热压后的钢板上采取样品(70mm×150mm),使用日本帕卡濑精公司生产的PB-SX35在标准条件下实施化学处理后,将关西涂料公司生产的电沉积涂料GT-10HT(灰色)在170℃×20分钟的烧结条件下形成膜厚20μm的膜,制得涂装试片。将制好的涂装试片在40℃的蒸馏水中浸渍10天后,立即对实施了化学处理和电沉积涂装的面用切刀以切至钢基底的方式切割成十字划格(10×10个,1mm间隔),进行利用胶带来粘贴和剥离的十字划格胶带剥离试验。按以下标准进行评价,如果评价结果为◎、○,则视为涂装密合性优异。
◎:未剥离
○:1~10个十字划格剥离
△:11~30个十字划格剥离
×:31个以上十字划格剥离
耐穿孔腐蚀性:从模拟热压后的钢板上采取样品(70mm×150mm),将样品的非评价面和端面用胶带密封后,实施150次以盐水喷雾(5质量%NaCl水溶液,35℃,2h)→干燥(60℃,相对湿度20~30%,4h)→湿润(50℃,相对湿度95%,2h)为1次循环的复合腐蚀试验,用盐酸除去腐蚀生成物和镀层。然后,使用测微计测定腐蚀明显的10处部位的板厚Tn(n=1~10)和未腐蚀的5处密封部的平均板厚T0,求出(T0-Tn)的最大值、即最大板厚减少值,按以下标准进行评价,如果评价结果为◎、○、△,则视为满足本发明的目的。
◎:最大板厚减少值≤0.1mm
○:0.1mm<最大板厚减少值≤0.2mm
△:0.2mm<最大板厚减少值≤0.3mm
×:0.3mm<最大板厚减少值
耐搭接腐蚀性:从模拟热压后的钢板上采取大样品(70mm×150mm)和小样品(40mm×110mm),将小样品重叠在大样品的中央(搭接),通过焊接进行接合,在将该样品用日本帕卡濑精公司生产的PB-SX35在标准条件下实施化学处理后,将关西涂料公司生产的电沉积涂料GT-10HT(灰色)在170℃×20分钟的烧结条件下形成膜厚20μm的膜,制得搭接试片。将制好的搭接试片的非评价面用胶带密封后,实施150次以盐水喷雾(5质量%NaCl水溶液,35℃,2h)→干燥(60℃,相对湿度20~30%,4h)→湿润(50℃,相对湿度95%,2h)为1次循环的复合腐蚀试验,在试验后的样品的焊接部打孔,解体,求出搭接处内的最大腐蚀深度,按以下标准进行评价,如果评价结果为◎、○、△,则视为满足本发明的目的。
◎:最大腐蚀深度≤0.1mm
○:0.1mm<最大腐蚀深度≤0.2mm
△:0.2mm<最大腐蚀深度≤0.4mm
×:0.4mm<最大腐蚀深度
耐金属模具附着性:为对热压时的镀层成分向金属模具的附着进行评价,采取热压前的样品(50×500mm),将样品在炉温890℃下加热,在板温700℃时用金属模具包夹样品,以50mm/s进行滑动,目视观察镀层成分向金属模具的附着状态。
对该状态按以下标准进行评价,如果评价结果为◎、○,则视为良好。
◎:无附着
○:有少许附着
△:有明显附着
×:有显著附着
结果示于表1。可知,在本发明的实施例中,各钢板的涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性、耐金属模具附着性均优异。
表1
﹡EG:电镀锌
GI:热镀锌
GA:合金化热镀锌(Fe含量:10质量%)
ZN:电镀Zn-Ni合金(Ni含量:表中记载)
GL:热镀Zn-Al合金(Al含量:55质量%)
ZM1:热镀Zn-Al-Mg合金(Al含量:5质量%,Mg含量:0.5质量%)
ZM2:热镀Zn-Al-Mg合金(Al含量:6质量%,Mg含量:3质量%)
另外,本实施例中,实际上没有进行利用热压进行的加工。但是,由于涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性和耐金属模具附着性受由热压前的加热引起的镀层变化左右,因此,能用本实施例的结果评价热压部件的涂料密合性、耐穿孔腐蚀性、耐搭接腐蚀性和耐金属模具附着性。
Claims (8)
1.热压用钢板,其特征在于,在钢板表面的平均铁素体粒径在20μm以下的钢板上具有附着量为10~90g/m2的Zn系镀层。
2.根据权利要求1所述的热压用钢板,其特征在于,所述Zn系镀层是含有10~25质量%Ni、余部由Zn和不可避免的杂质构成的镀层。
3.根据权利要求2所述的热压用钢板,其特征在于,所述Zn系镀层中所含的η相的量在5质量%以下。
4.根据权利要求1~3中任一项所述的热压用钢板,其特征在于,所述Zn系镀层的基底钢板具有如下成分组成:以质量计,含有C:0.15~0.5%、Si:0.05~2.0%、Mn:0.5~3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下,余部由Fe和不可避免的杂质构成。
5.根据权利要求4所述的热压用钢板,其特征在于,所述Zn系镀层的基底钢板以质量计,还含有选自Cr:0.01~1%、Ti:0.2%以下、B:0.0005~0.08%中的至少一种。
6.根据权利要求4或5所述的热压用钢板,其特征在于,所述Zn系镀层的基底钢板以质量计,还含有Sb:0.003~0.03%。
7.热压用钢板的制造方法,其特征在于,对具有权利要求4~6中任一项所述的成分组成的钢板进行760~840℃的热处理后,形成附着量为10~90g/m2的Zn系镀层。
8.热压部件的制造方法,其特征在于,在将权利要求1~6中任一项所述的热压用钢板加热到Ac3相变点~1000℃的温度范围后进行热压。
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US10858718B2 (en) | 2016-03-29 | 2020-12-08 | Jfe Steel Corporation | Steel sheet for hot press and method of manufacturing same, and hot-press forming part and method of manufacturing same |
US11293075B2 (en) | 2016-03-29 | 2022-04-05 | Jfe Steel Corporation | Hot-press forming part and method of manufacturing same |
CN115053009A (zh) * | 2020-03-03 | 2022-09-13 | 杰富意钢铁株式会社 | 热压部件及其制造方法以及热压用镀覆钢板 |
CN115298344A (zh) * | 2020-03-27 | 2022-11-04 | 日本制铁株式会社 | 热压成型体 |
CN115298344B (zh) * | 2020-03-27 | 2023-05-12 | 日本制铁株式会社 | 热压成型体 |
CN114150252A (zh) * | 2021-11-30 | 2022-03-08 | 马鞍山钢铁股份有限公司 | 一种镀层热成形钢板、具有优良胶粘性能的热冲压零部件及制造方法和应用 |
CN114150252B (zh) * | 2021-11-30 | 2023-08-29 | 马鞍山钢铁股份有限公司 | 一种镀层热成形钢板、具有优良胶粘性能的热冲压零部件及制造方法和应用 |
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TW201348512A (zh) | 2013-12-01 |
EP2808417A4 (en) | 2015-03-25 |
CN104136650B (zh) | 2017-04-19 |
US10253386B2 (en) | 2019-04-09 |
KR20140128409A (ko) | 2014-11-05 |
EP2808417B1 (en) | 2019-04-24 |
JPWO2013132816A1 (ja) | 2015-07-30 |
KR101678511B1 (ko) | 2016-11-22 |
JP5861766B2 (ja) | 2016-02-16 |
WO2013132816A1 (ja) | 2013-09-12 |
TWI555879B (zh) | 2016-11-01 |
US20150027596A1 (en) | 2015-01-29 |
EP2808417A1 (en) | 2014-12-03 |
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