JP5876895B2 - ホットスタンプ用亜鉛めっき鋼板の製造方法 - Google Patents
ホットスタンプ用亜鉛めっき鋼板の製造方法 Download PDFInfo
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- JP5876895B2 JP5876895B2 JP2014093186A JP2014093186A JP5876895B2 JP 5876895 B2 JP5876895 B2 JP 5876895B2 JP 2014093186 A JP2014093186 A JP 2014093186A JP 2014093186 A JP2014093186 A JP 2014093186A JP 5876895 B2 JP5876895 B2 JP 5876895B2
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- annealing
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 38
- 239000008397 galvanized steel Substances 0.000 title claims description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 88
- 239000010959 steel Substances 0.000 claims description 88
- 238000000137 annealing Methods 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 47
- 239000010960 cold rolled steel Substances 0.000 claims description 26
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 238000007747 plating Methods 0.000 description 49
- 238000010438 heat treatment Methods 0.000 description 24
- 230000008569 process Effects 0.000 description 22
- 230000009467 reduction Effects 0.000 description 19
- 239000002585 base Substances 0.000 description 14
- 238000005246 galvanizing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 238000005098 hot rolling Methods 0.000 description 9
- 238000005554 pickling Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000002791 soaking Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 238000005238 degreasing Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 238000005275 alloying Methods 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- -1 amine organic compound Chemical class 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- POWFTOSLLWLEBN-UHFFFAOYSA-N tetrasodium;silicate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-][Si]([O-])([O-])[O-] POWFTOSLLWLEBN-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- 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
- C21D8/0273—Final recrystallisation annealing
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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
- 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
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- 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
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- C—CHEMISTRY; METALLURGY
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
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- C21D1/62—Quenching devices
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- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- C—CHEMISTRY; METALLURGY
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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
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- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
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- C21D8/0226—Hot rolling
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- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22C18/00—Alloys based on zinc
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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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
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
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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
- 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
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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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
- 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
- C23C2/405—Plates of specific length
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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]
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Description
Cは、固溶強化元素として、ホットスタンプ後の鋼板(部品、以下、ホットスタンプ成形品と呼ぶ場合がある。)の高強度化に寄与する元素である。ホットスタンプにより、所望とする980MPa以上の高強度を得るためには、C量の下限を0.10%以上とする。C量の下限は、好ましくは0.13%以上、より好ましくは0.15%以上、更に好ましくは0.17%以上である。しかしながら、C量が過剰になると、ホットスタンプ成形品の溶接性が低下するため、その上限を0.5%とする。C量の上限は、好ましくは0.40%以下、より好ましくは0.35%以下、更に好ましくは0.30%以下である。
Siは、ホットスタンプ成形品のスポット溶接部の接合強度向上に寄与する元素である。またSiは、ホットスタンプの徐冷工程における焼き戻しを防止して部品の強度を保つ効果を有している。更にSiは、残留オーステナイトを生成して部品の延性向上にも寄与する元素である。これらの効果を有効に発揮させるため、Si量の下限を0.7%以上とする。Si量の下限は、好ましくは0.75%以上であり、より好ましくは0.80%以上、更に好ましくは0.90%以上、より更に好ましくは1.0%以上である。しかしながら、Si量が過剰になると、強度が高くなり過ぎて素地鋼板(熱延酸洗鋼板または冷延鋼板)製造時の圧造負荷が増大するほか、熱間圧延の際に素地鋼板表面にSiO2を含むスケールが発生し、めっき後の鋼板の表面性状が悪化するため、その上限を2.5%とする。Si量の上限は、好ましくは2.3%以下であり、より好ましくは2.1%以下である。
Mnは、焼入れ性を高め、ホットスタンプ成形品の高強度バラツキを抑えるために有用な元素である。このような作用を有効に発揮させるため、Mn量の下限を、1.0%以上とする。しかし、Mn量が過剰になると、強度が高くなり過ぎて素地鋼板製造時の圧延負荷が増大するため、その上限を3%以下とする。Mn量の好ましい下限は1.2%以上、より好ましい下限は1.5%以上、さらに好ましくは1.7%以上であり、好ましい上限は2.8%以下、より好ましい上限は2.5%以下である。
Alは脱酸のために必要な元素であり、そのため、Al量の下限を0.01%以上とする。好ましくは0.03%以上である。しかしながら、Al量が過剰になると上記効果が飽和するだけでなく、アルミナ等の介在物が増加して加工性が劣化するため、Al量の上限を0.5%とする。好ましくは0.3%以下である。
Bは鋼材の焼入れ性を向上させる元素である。この効果を発揮させるには、Bを0.0003%以上含有させることが好ましい。より好ましくは0.0005%以上(更に好ましくは0.0010%以上)とするのがよい。一方、Bが0.005%を超えると、ホットスタンプ成形品中に粗大なホウ化物が析出して成形品の靭性が劣化するため、好ましくは0.005%以下(より好ましくは0.004%以下)とする。
Tiは、Nを固定して、Bによる焼入れ効果を確保する役割を持つ元素である。またTiは、組織を微細化する効果も併せ持つ。組織が微細化することで部品延性が向上する。こうした作用を充分に発揮させるために、Ti量は、0.01%以上とすることが好ましい。より好ましくは0.02%以上である。しかし、Ti量が過剰であると、鋼板の延性が劣化するため、Ti量を0.10%以下とすることが好ましい。より好ましくは0.07%以下である。
CrおよびMoは、素地鋼板の焼入れ性を向上させるために有効な元素であり、これらの元素を含有させることによってホットスタンプ成形品における硬さばらつきの低減が期待できる。これらの元素は単独で添加しても良いし、2種類を併用しても良い。このような作用を有効に発揮させるためには、これら元素の合計量(単独で含むときは単独の量であり、2種類を併用するときは合計量である。)を0.01%以上とすることが好ましい。より好ましくは0.05%以上、更に好ましくは0.1%以上である。しかしながら、これらの合計量が過剰になると、上記効果が飽和すると共に、コストも上昇するため、その上限を1%以下とすることが好ましい。より好ましくは0.5%以下、更に好ましくは0.3%以下である。
Nb、Zr、Vは組織を微細化する効果を有しており、組織が微細化することで部品の延性を向上させる効果を有する。このような効果を有効に発揮させるには、これら元素の合計量(単独で含むときは単独の量であり、2種類以上を併用するときは合計量である。)の下限を0.01%以上とすることが好ましく、より好ましくは0.02%以上である。しかしながら、これらの元素の合計量が過剰になると、その効果が飽和してコストの上昇を招くため、その上限を0.1%以下とすることが好ましい。より好ましくは0.05%以下である。
CuおよびNiは、ホットスタンプ成形品に耐遅れ破壊性を付与したいときに、必要に応じて添加される元素である。これらの元素は、単独で添加しても良いし、2種類を併用しても良い。このような作用を有効に発揮させるためには、これら元素の合計量(単独で含むときは単独の量であり、2種類を併用するときは合計量である。)を0.01%以上とすることが好ましい。より好ましくは0.05%以上である。しかしながら、これらの量が過剰になると、鋼板製造時における表面疵の発生原因となるため、その上限を1%以下とすることが好ましい。より好ましくは0.5%以下である。
所定成分の鋼を鋳造→加熱→熱間圧延→酸洗(→必要に応じて、冷間圧延)→溶融亜鉛めっき工程(→必要に応じて、更に合金化工程)
そして本発明では、後に詳述する通り、溶融亜鉛めっき工程の焼鈍工程における、還元炉による焼鈍(還元性雰囲気下での熱処理)での焼鈍条件(温度および時間)を適切に制御したところに最大の特徴がある。
仕上げ圧延温度(FDT):800〜950℃
巻き取り温度(CT):500〜700℃
表1に記載の化学組成を有する鋼(単位は質量%)のスラブを、1200℃に加熱した後、表1に記載の方法で熱間圧延[FDT(仕上げ圧延)→CT(巻取)]→酸洗工程によるデスケーリング処理→冷間圧延を行なって冷延鋼板(原板、めっき鋼板における素地鋼板に相当)を得た。
上記冷延鋼板を切断して得られた短冊状ブランク(長さ:30mm、幅:210mm)を用い、ホットスタンプを模擬したヒートパターンを以下のように施した。
上記ホットスタンプ模擬実験後のブランクを、以下のスポット溶接試験に供し、接合部の強度(十字継手破断荷重)を測定した。溶接電流は、ナゲット径が4×√t(t:板厚)となるように調節した。
試験片条件:十字張力用試験片(JIS Z3137に準拠)
溶接機:単相交流式スポット溶接機
電極:先端径φ6mmのドームラジアスタイプ
加圧力:4kN
初期加圧時間:60サイクル
通電時間:10サイクル(電源周波数60Hz)
上記冷延鋼板を切断し、100mm×150mmの試験片を得た。この試験片を、60℃の3%オルソ珪酸ナトリウム中で20A、20秒間電解脱脂した後、水道水中で5秒間流水にて水洗した。このようにしてアルカリ脱脂した試験片を用いて、めっきシミュレータにて、5%H2−N2、露点−45℃または−15℃の還元性雰囲気下で表2に記載の焼鈍を行なった。
Claims (7)
- C:0.13〜0.5%(質量%の意味、以下、同じ)、Si:0.7〜2.5%、Mn:1.0〜3%、Al:0.01〜0.5%、およびB:0.005%以下(0%を含まない)を含有する熱延酸洗鋼板または冷延鋼板を、還元性雰囲気で焼鈍した後、めっきしてホットスタンプ用亜鉛めっき鋼板を製造する方法であって、
前記焼鈍を、500〜680℃の範囲で30〜270秒行なうことを特徴とするホットスタンプ用亜鉛めっき鋼板の製造方法。 - 前記焼鈍は、−45〜−60℃の露点範囲で行う請求項1に記載のホットスタンプ用亜鉛めっき鋼板の製造方法。
- 前記熱延酸洗鋼板または冷延鋼板は、更に、Tiを0.10%以下(0%を含まない)含むものである請求項1または2に記載の製造方法。
- 前記熱延酸洗鋼板または冷延鋼板は、更に、Crおよび/またはMoを合計で1%以下(0%を含まない)含むものである請求項1〜3のいずれかに記載の製造方法。
- 前記熱延酸洗鋼板または冷延鋼板は、更に、Nb、ZrおよびVよりなる群から選択される1種以上の元素を合計で0.1%以下(0%を含まない)含むものである請求項1〜4のいずれかに記載の製造方法。
- 前記熱延酸洗鋼板または冷延鋼板は、更に、Cuおよび/またはNiを合計で1%以下(0%を含まない)含むものである請求項1〜5のいずれかに記載の製造方法。
- 前記亜鉛めっき鋼板は、溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板である請求項1〜6のいずれかに記載の製造方法。
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JP6505480B2 (ja) * | 2014-08-29 | 2019-04-24 | 株式会社神戸製鋼所 | 溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板、および溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板 |
JP6082451B2 (ja) * | 2015-03-18 | 2017-02-15 | 株式会社神戸製鋼所 | 熱間プレス用鋼板およびその製造方法 |
CN104694838B (zh) * | 2015-03-23 | 2016-08-17 | 苏州劲元油压机械有限公司 | 一种用于钢结构工程的高韧钢及其热处理工艺 |
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CN106756697A (zh) | 2017-05-31 |
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EP2843077B1 (en) | 2020-01-08 |
CN104271789B (zh) | 2017-06-06 |
MX2014012798A (es) | 2015-04-14 |
JP2014159624A (ja) | 2014-09-04 |
US20160032439A1 (en) | 2016-02-04 |
US20150125716A1 (en) | 2015-05-07 |
CN104271789A (zh) | 2015-01-07 |
EP2843077A1 (en) | 2015-03-04 |
EP2843077A4 (en) | 2016-04-13 |
CN106756697B (zh) | 2020-03-13 |
WO2013161831A1 (ja) | 2013-10-31 |
KR101716625B1 (ko) | 2017-03-14 |
KR20140136509A (ko) | 2014-11-28 |
JP5973953B2 (ja) | 2016-08-23 |
KR101950546B1 (ko) | 2019-02-20 |
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