WO2009096596A1 - 高強度鋼板およびその製造方法 - Google Patents
高強度鋼板およびその製造方法 Download PDFInfo
- Publication number
- WO2009096596A1 WO2009096596A1 PCT/JP2009/051915 JP2009051915W WO2009096596A1 WO 2009096596 A1 WO2009096596 A1 WO 2009096596A1 JP 2009051915 W JP2009051915 W JP 2009051915W WO 2009096596 A1 WO2009096596 A1 WO 2009096596A1
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- WIPO (PCT)
- Prior art keywords
- less
- steel sheet
- martensite
- temperature range
- strength
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 137
- 239000010959 steel Substances 0.000 title claims abstract description 137
- 238000004519 manufacturing process Methods 0.000 title claims description 37
- 238000000034 method Methods 0.000 title claims description 24
- 230000008569 process Effects 0.000 title claims description 17
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 159
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 21
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 48
- 229910052742 iron Inorganic materials 0.000 claims description 44
- 150000001247 metal acetylides Chemical class 0.000 claims description 35
- 230000009466 transformation Effects 0.000 claims description 30
- 238000005496 tempering Methods 0.000 claims description 29
- 238000000137 annealing Methods 0.000 claims description 24
- 238000007747 plating Methods 0.000 claims description 19
- 239000010960 cold rolled steel Substances 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 13
- 229910052725 zinc Inorganic materials 0.000 claims description 13
- 239000011701 zinc Substances 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 11
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 8
- 229910001567 cementite Inorganic materials 0.000 abstract description 10
- 229910001563 bainite Inorganic materials 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract description 3
- 238000005246 galvanizing Methods 0.000 description 17
- 238000011282 treatment Methods 0.000 description 15
- 238000005275 alloying Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 238000010791 quenching Methods 0.000 description 12
- 230000000171 quenching effect Effects 0.000 description 12
- 239000010949 copper Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 239000008397 galvanized steel Substances 0.000 description 6
- 235000016068 Berberis vulgaris Nutrition 0.000 description 5
- 241000335053 Beta vulgaris Species 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 238000003303 reheating Methods 0.000 description 5
- 235000013339 cereals Nutrition 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000008896 Opium Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000005244 galvannealing Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- -1 iron carbides Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229960001027 opium Drugs 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- FQXXSQDCDRQNQE-UHFFFAOYSA-N markiertes Thebain Natural products COC1=CC=C2C(N(CC3)C)CC4=CC=C(OC)C5=C4C23C1O5 FQXXSQDCDRQNQE-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- QKQQEIVDLRUZRP-UHFFFAOYSA-N northebaine Natural products COC1=CC=C2C(NCC3)CC4=CC=C(OC)C5=C4C23C1O5 QKQQEIVDLRUZRP-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
-
- 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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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
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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
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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
- C22C38/06—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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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
-
- 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
- C23C2/26—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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0468—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment between cold rolling steps
Definitions
- the present invention relates to a high strength steel plate having a tensile strength of 900 MPa or more and excellent in formability used in industrial fields such as automobiles and electricity.
- the high-strength steel sheet of the present invention includes a steel sheet surface that has been subjected to hot dip galvanization or alloyed hot dip galvanization. Background art
- Patent Document 1 specifies the component composition, hot rolling and annealing conditions, and has a high tensile strength: 588 to 882 MPa.
- Tensile steel sheet and method for producing the same Patent Document 2 discloses a method for producing a high-tensile cold-rolled steel sheet having excellent bendability by prescribing conditions for hot rolling, cold rolling and annealing of steel having a predetermined composition. Proposed.
- Patent Document 3 describes a steel plate excellent in collision safety and formability by specifying a martensite fraction, its particle size, and mechanical characteristics, and a manufacturing method thereof.
- Patent Document 5 a high-strength steel sheet with excellent stretch freezing properties and shape freezing properties and impact resistance properties is defined by defining the component composition, the ferrite particle size, the texture and the martensite fraction, High-strength hot-dip galvanized steel sheet Hot-dip galvanized steel sheet and its manufacturing method, Patent Document 6 proposes a high-strength steel sheet with excellent mechanical properties and its manufacturing method by specifying the composition of ingredients and the manufacturing method of martensite amount Has been.
- Patent Documents 7 and 8 include high-strength hot-dip galvanized steel sheets and high-strength hot-dip zinc, which are excellent in stretch flangeability and bendability by specifying the composition of the components and the production conditions in the hot-dip galvanizing line. A method and equipment for producing steel plates have been proposed.
- Patent Document 9 defines the component, particle size, hardness ratio, etc., with the hard second phase as martensite and / or vinyl.
- Patent Document 10 discloses a steel sheet with excellent stretch flangeability by defining the composition and hardness ratio thereof mainly with the bait or parlite as the second base. Proposed.
- Patent Document 11 describes a high strength, high ductility hot-dip galvanized steel plate with excellent hole expansibility consisting of bainite and martensite as a hard second phase and a manufacturing method thereof, and Patent Document 1 2 describes a hard second phase.
- Patent Documents 13 and 13 define high-tensile steel sheets that are excellent in ductility and hole expandability by specifying the composition of components and the amount of retained austenite, and Patent Documents 14 and 14 describe the contents of beanite and retained austenite and / or martensite.
- a high-strength cold-rolled steel sheet with excellent workability has been proposed by prescribing the component composition and the fraction of each phase, etc., in a steel sheet containing steel.
- Patent Document 15 describes the distribution of hard second-phase grains in ferrite and the existence ratio of grains composed of tempered martensite and bainite, thereby providing high strength with excellent workability.
- a steel plate and a manufacturing method thereof have been proposed.
- Patent Document 16 describes the ultrahigh tensile cold-rolled steel with excellent delayed fracture resistance with a tensile strength of l lSOMPa or more by specifying the component composition and manufacturing process.
- Patent Document 17 describes the manufacturing method of the ultra-high-tensile cold-rolled steel plate that has excellent bendability with a tensile strength of 980 MPa or more by specifying the component composition and the manufacturing method
- Patent Document 18 proposes an ultra-high strength thin steel plate with a tensile strength of 9S0MPa or more and its manufacturing method that prevents hydrogen embrittlement by limiting the number of iron-based carbides in tempered martensite to a certain number. Has been.
- Patent Documents 1-7, 9- No. 10 1 to 14 are inventions for steel sheets with a tensile strength of less than 900 MPa, and workability cannot often be ensured if the strength is further increased. Further, Patent Document 1 stipulates that annealing is performed in a single-phase region and the subsequent cooling is performed at 6 to 20 ° C / second to 400 ° C. In addition, it is necessary to raise the temperature before plating in order to cool to 400 ° C or less, so it is necessary to raise the temperature before plating. Cannot be produced with a continuous hot dip galvanized line.
- Patent Documents 7 and 8 since it is necessary to generate tempered martensite during the heat treatment in the hot dip galvanizing line, equipment for reheating after cooling to the Ms point or lower is required.
- the phase composition of the hard second phase is defined as the bainite and martensite, and the fraction is specified, but in the specified range, the characteristic variation is large, and in order to suppress the variation Therefore, precise control of operating conditions is required.
- Patent Document 15 in order to cool to the Ms point or lower in order to generate martensite before the transformation, it is necessary to provide reheating equipment. Since precise control is indispensable, the cost of equipment and operation increases.
- Patent Documents 16 and 17 it is necessary to keep the structure in the temperature range where the bainite is formed after annealing in order to make the structure mainly composed of bainite, and it is difficult to ensure ductility. In this case, it is necessary to re-ripe more than the bath temperature.
- Patent Document 18 shows only an improvement in hydrogen embrittlement of a steel sheet, and hardly any consideration is given to workability except for a few studies of bending workability.
- the ratio of the hard second phase In general, in order to increase the strength of a steel sheet, it is necessary to increase the ratio of the hard second phase to the entire structure. However, if the ratio of the hard second phase is increased, the workability of the steel sheet will be hard second. It is strongly influenced by the workability of the phase. This is because, when the proportion of the hard second phase is small, the ferrite itself, which is the parent phase, is deformed, so that the minimum additivity is ensured even when the additivity of the hard second phase is not sufficient. However, when the ratio of the hard second phase is large, the deformability of the hard second phase itself directly affects the formability of the steel sheet, not the deformation of the ferrite, and the workability is not sufficient. This is because the moldability deteriorates significantly.
- martensite is produced by water quenching by adjusting the fraction of ferrite and hard second phase in a continuous annealing facility with a water quenching function. After the formation, the workability of the hard phase has been improved by maintaining the temperature rise and tempering the martensite.
- ferritic is used as the parent phase
- the hard second phase containing carbide containing carbide is used as a hard phase. Workability has been secured and stretch flangeability has been secured, but in this case sufficient ductility could not be secured.
- the second phase is martensite or residual austenite (including the vein containing residual austenite), in order to ensure stretch flangeability at the same time as ductility, for example, the second phase structure Consideration has been made such as making a mixed organization of martensite and bainto.
- Patent Document 1 Japanese Patent No. 1853389
- Patent Document 2 Japanese Patent No. 3610883
- Patent Document 3 Japanese Patent Laid-Open No. 11-61327
- Patent Document 4 Japanese Patent Laid-Open No. 2003-213369
- Patent Document 5 Japanese Unexamined Patent Publication No. 2003-213370
- Patent Document 6 Special Table 2003-505604
- Patent Document 7 JP-A-6-93340
- Patent Document 8 JP-A-6-108152
- Patent Document 9 Japanese Patent Laid-Open No. 7-11383
- Patent Document 10 Japanese Patent Laid-Open No. 10-60593
- Patent Document 1 1 JP-A-2005-281854
- Patent Document 1 2 Japanese Patent No. 3231204 Patent Document 1 3 Japanese Patent Laid-Open No. 2001-207234
- Patent Document 1 Japanese Patent Laid-Open No. 7-207413
- Patent Document 1 JP 2005-264328 A
- Patent Document 1 Japanese Patent No. 2616350
- Patent Document 1 Japanese Patent No. 2621744
- Patent Document 1 Japanese Patent No. 2826058 Disclosure of Invention
- the present invention advantageously solves the above-mentioned problems, minimizes the generation of the strength that tends to vary in properties such as strength and formability, and can achieve both high strength and excellent formability.
- the purpose is to supply high-strength steel sheets of 900MPa or more together with their advantageous manufacturing method.
- TS X T. is indicative of the EL and stretch flangeability, and shall be evaluated by a value, in the present invention, TS X T. El ⁇ 14500MPa ⁇ %, tut ⁇ 1 5% of target characteristics And
- the inventors studied the process of martensite formation, particularly the effect of steel sheet cooling conditions on the martensite.
- the martensite after transformation is tempered at the same time as the martensite transformation, and the auto-tempered martensite generated by this treatment is brought to a predetermined ratio.
- the excellent formability and tensile strength targeted by the present invention High strength steel with high strength of 900 MPa or more The knowledge that a board is obtained was acquired.
- the present invention has been completed based on the above findings and has been further studied.
- the gist of the present invention is as follows.
- Mn 0.5% or more 3.0% or less
- the balance consists of Fe and inevitable impurities, and the area ratio of steel structure is 5% to 80% ferrite, 15% auto tempered martensite, and 10% bainite residue.
- Austenite is 5% or less
- as-quenched martensite is 40% or less
- the average hardness of the auto-tempered martensite is HV ⁇ 700, and 5 nm or more and 0.5 i Di or less in the auto-tempered martensite
- a high-strength steel sheet characterized in that the average number of precipitations of iron-based carbide is 5 x 10 4 or more per 1 mm 2 and the tensile strength is 900 MPa or more.
- the steel sheet is further mass%
- V 0.005% to 1.0%
- the steel sheet is further mass%
- Nb 0.01% or more and 0.1% or less
- Ni 0.05% or more and 2.0% or less
- the steel sheet is further mass%
- iron tempered martensite iron system of 0.1 zm or more and 0.5 ⁇ or less
- the ratio of the auto-tempered martensite in which the number of precipitated carbides is 5 ⁇ 10 2 or less per 1 mm 2 is 3% or more in terms of the area ratio with respect to the whole auto-tempered martensite. 5.
- the steel slab having the composition described in any one of 1 to 4 above is hot-rolled and then cold-rolled into a cold-rolled steel sheet, and then the cold-rolled steel sheet is at least 700 ° C and 950 ° C.
- the cooling conditions in the second temperature range from the first temperature range to 420 ° C are changed from the first temperature range to 550 ° C.
- the average cooling rate is 3 ° C / second or more
- the time required for cooling from 550 ° C to 420 ° C is 600 seconds or less
- the third temperature range from 250 ° C to 420 ° C is 50 ° C / second.
- the temperature range of at least (Ms point one 50) ° C or less is 1.0. Cooling at a rate of not less than ° C / sec and not more than 50 ° C / sec, causing martensite transformation in the third temperature range, and at the same time performing auto-tempering treatment to temper the martensite after transformation 9.
- the martensite transformation start point Ms is approximated by M represented by the following equation (1), which is 300 ° C or higher, and is described in the above 8 or 9 Manufacturing method of high strength steel sheet.
- the [X%] is mass 0/0 of component element X of the steel strip
- Non%] is polygonal Blow wells area ratio (%).
- an appropriate amount of auto-tempered martensite is contained in the steel sheet, and the distribution state of carbides in the auto-tempered martensite is appropriately controlled, thereby achieving high strength and excellent performance.
- Tensile strength with both workability and excellent ductility A high-strength steel sheet with a strength of 900 MPa or more can be obtained. Therefore, it greatly contributes to reducing the weight of automobile bodies.
- Fig. 1 is a schematic diagram showing a quenching and tempering process for obtaining a normal tempered martensite.
- FIG. 2 is a schematic diagram showing a phototempering process for obtaining a phototempered martensite according to the present invention.
- the ratio of ferrite to the hard phase described below is important, and the ferrite area ratio must be 5% or more and 80% or less. . If the area ratio of the ferrite is less than 5%, ductility cannot be secured. On the other hand, if the ferrite area ratio exceeds 80%, the area ratio of the hard phase cannot be secured and the strength becomes insufficient.
- Preferred Fuwerai DOO area ratio is in the range of more than 10% 6 5% or less.
- the phototempered martensite is not a so-called tempered martensite obtained by quenching and tempering as in the prior art, but is obtained by simultaneously proceeding martensite transformation and tempering by autotempering.
- the structure is not a uniform tempered structure formed by heating and tempering after completion of the martensite transformation by quenching, as in normal quenching / tempering treatment, but in the region below the Ms point.
- This is a structure in which martensite with different tempering conditions is mixed by controlling the cooling process of the steel and proceeding through the martensite transformation and tempering step by step.
- This auto temper martensite is a hard phase for increasing strength. If the area ratio of auto-tempered martensite is less than 15%, strength cannot be secured and work hardening of the ferrite cannot be accelerated. Therefore, the area ratio of auto-tempered martensite must be 15% or more. Preferably it is 30% or more.
- the steel sheet structure is preferably composed of ferrite and autotempered martensite in the above-described range.
- other phases such as vanite, residual austenite, and as-quenched martensite may be formed, but if these are within the allowable ranges described below, Even if a phase is formed, there is no problem. These allowable ranges are described below.
- Veneer area ratio 10% or less (including 0%)
- Venite is a hard phase that contributes to high strength. However, it is desirable that the steel structure does not contain as much as possible because the characteristics may change greatly depending on the temperature range of formation and increase the material variation. Is acceptable up to 10%. Preferably it is 5% or less.
- Residual austenite area ratio 5% or less (including 0%)
- Residual austenite is transformed during processing to become hard martensite, which reduces elongation flangeability. For this reason, it is desirable to have as little as possible in the steel structure, but up to 5% is acceptable. Preferably it is 3% or less.
- Quenched martensite area ratio 40% or less (including 0%)
- Quenched martensite is extremely inferior in workability, so it is desirable that it is as small as possible in the steel structure, but up to 40% is acceptable. Preferably, it is 30% or less. Quenched martensite can be distinguished from autotempered martensite by the fact that carbides are not observed by observation with a scanning electron microscope (SEM) or transmission electron microscope (TEM). Average hardness of auto-tempered manoleite sites: HV ⁇ 700
- HV 700 is set.
- Iron-based carbides in hot tempered martensite Iron-based carbides in hot tempered martensite:
- Autotempered martensite is a manotenite site that has been heat-treated (autotempered) by the method of the present invention. However, even when the average hardness of auto-tempered martensite is HV ⁇ 700, if auto-tempering is not appropriate, the workability is reduced. The degree of auto-tempering can be confirmed by the production status (distribution state) of iron-based carbides in auto-tempered martensite.
- iron-based carbides those with a size of 5 nm or more and 0.5 ⁇ or less and the average number of precipitates are 5 ⁇ 10 4 or more per 1 mm 2 , the desired autotempering treatment is applied It can be judged. The reason why iron carbide is less than 5 nm is not considered because it does not affect the workability of autotempered martensite. On the other hand, iron-based carbides with a size exceeding 0.5 ⁇ may not reduce the strength of auto-tempered martensite, but have a minor effect on workability and are not subject to judgment.
- the preferred number of iron-based carbides is in the range of 1 ⁇ 10 5 or more and 1 ⁇ 10 6 or less per 1 mm 2 , more preferably 4 ⁇ 10 5 or more and 1 ⁇ 10 6 or less.
- the iron-based carbide mentioned here is mainly Fe 3 C, but may include other ⁇ carbides.
- Carbide identification can be performed by, for example, SEM-EDS (energy dispersive X-ray analysis), EPMA (electron beam microanalyzer), FE-AES (field emission-Auger electron spectroscopy) of cross-section polished samples.
- SEM-EDS energy dispersive X-ray analysis
- EPMA electron beam microanalyzer
- FE-AES field emission-Auger electron spectroscopy
- the amount of the autotempered martensite further limiting the size and number of iron-based carbides precipitated in the autotempered martensite is appropriately determined. As below can do.
- Ductility is further improved by increasing the proportion of iron tempered martensite with an iron carbide content of not less than 0 and not more than 0.5 ⁇ at 5 ⁇ 10 2 per 1 mm 2 .
- the ratio of auto-tempered martensite in which the number of precipitates of iron carbide of 0.1 lm or more and 0.5 / im or less is 5 ⁇ 10 2 or less per 1 mm 2 is determined by auto-tempered martensite. It is preferable to set the area ratio to 3% or more with respect to the whole.
- deposition numbers of 0.5 ⁇ m following iron-based carbide or 0.5 is lmm 2 per 5X10 2 or less auto-tempered - Domarutensai DOO is, to significantly degrade the workability to be present in multiple quantities in the steel sheet, It is preferable that the ratio of such auto-tempered martensite is 40% or less in terms of the area ratio with respect to the entire auto-tempered martensite. More preferably, it is 30% or less.
- the ratio of auto-tempered martensite where the number of precipitates of iron-based carbides from 0. to 0.5 111 or less is 5X10 2 or less per lmm 2 is 3% or more in terms of the area ratio with respect to the entire auto-tempered martensite.
- the iron-based carbides contained in the autotempered martensite increase in fine iron-based carbides, so that the average number of iron carbide precipitates in the entire auto-tempered martensite increases. Therefore, it is preferable that the average number of iron carbide precipitates of 5 nm or more and 0.5 m or less in the auto-tempered martensite be in the range of 1 ⁇ 10 5 or more and 5 ⁇ 10 6 or less per 1 mm 2 .
- the autotempered martensite structure is a structure in which a portion containing a relatively large amount of iron-based carbide and a portion containing a relatively large amount of iron-based carbide are mixed.
- the portion with relatively small iron-based carbides contains hard iron-tempered martensite because it contains a lot of fine iron-based carbides.
- a lot of relatively large iron-based carbides The part that contains it is soft auto-tempered martensite.
- % showing the following component composition shall mean the mass%.
- the C is an indispensable element for increasing the strength of steel sheets. If the C content is less than 0.1%, it is difficult to ensure both the strength of the steel sheet and workability such as ductility and stretch flangeability. On the other hand, if the amount of c exceeds 0.3%, the weld zone and the heat-affected zone are hardened, and the weldability deteriorates. Therefore, in the present invention, the C content is in the range of 0.1% to 0.3%. Preferably, it is in the range of 0.12% or more and 0.223% or less.
- Si is an effective element for strengthening the solid solution of ferrite, and it is preferable to contain 0.1% or more in order to ensure ductility and hardness of the ferrite. Occurrence causes deterioration of surface properties, plating adhesion and adhesion. Therefore, the Si content is 2.0% or less. Preferably, it is 1.6% or less.
- Mn 0.5% or more 3.0% or less
- Mn is an effective element for strengthening steel. It is an element that stabilizes austenide and is an element necessary to secure the area ratio of the hard phase. For this purpose, Mn should be added in an amount of 0.5% or more. On the other hand, if Mn exceeds 3.0% and is added excessively, it causes deterioration of forgeability. Therefore, the Mn content should be 0.5% or more and 3.0% or less. The range is preferably 1.5% or more and 2.5% or less.
- the P causes embrittlement due to grain boundary segregation and degrades impact resistance, but is acceptable up to 0.1%. Also, when alloying hot dip galvanizing, a p content exceeding 0.1% significantly delays the alloying rate. Therefore, the P content is 0.1% or less. Preferably it is 0.05% or less. S: 0.07% or less
- S is an inclusion such as MnS, and it is preferable to reduce it as much as possible because it causes deterioration of impact resistance and cracks along the metal flow of the weld. Permissible. A preferable amount of S is 0.04% or less.
- A1 is a ferritic element and is an effective element for controlling the amount of ferrite generated during manufacturing.
- the amount of A1 is 1.0% or less. Preferably, it is 0.5% or less. It should be noted that if the content of A1 is too small, deoxidation may become difficult, so the amount of A1 is preferably 0.01% or more.
- N is an element that causes the most deterioration in the aging resistance of steel. The smaller the amount, the better. If it exceeds 0.008%, the deterioration of aging resistance becomes significant. Therefore, the N content is 0.008% or less. Preferably it is 0.006% or less.
- the steel plate of the present invention can appropriately contain the components described below as necessary.
- Cr, V, and Mo have an action of suppressing the formation of pearlite during cooling from the annealing temperature, and can be added as necessary.
- the effect is obtained with Cr: 0.05% or more, V: 0.005% or more, and Mo: 0.005% or more.
- Cr if Cr is added in excess of 5.0%, V: 1.0%, Mo: 0.5%, the area ratio of the hard phase becomes excessive, resulting in an increase in strength more than necessary. Therefore, when these elements are contained, it is preferable that Cr: 0.005% to 5.0%, V: 0.005% to 1.0%, Mo: 0.005% to 0.5%.
- Ti, Nb, B, Ni and Cu can contain one or more selected from these, and the reasons for limiting the range of inclusion are as follows.
- Ti and Nb are effective for precipitation strengthening of steel. On the other hand, if it exceeds 0.1%, the workability and the shape freezing property decrease. Accordingly, the content of Ti and Nb is preferably in the range of 0.01% to 0.1%. B: 0.003% or more 0.005% or less
- B has an action of suppressing the formation and growth of ferrite from the austenite grain boundary, and can be contained as necessary.
- the effect is obtained with 0.000 to 3% or more, while the workability and exceeds 0.0050% decreases. Therefore, when B is contained, the content is preferably in the range of 0.0003% or more and 0.0050% or less.
- B when B is included, it is preferable to suppress the formation of BN in order to obtain the above-mentioned effect. For this reason, it is preferable to include B in combination with Ti.
- Ni and Cu promote internal oxidation and improve plating adhesion when hot-dip zinc plating is applied. The effect is obtained at 0.05% or more respectively. On the other hand, if the content exceeds 2.0%, the workability of the steel sheet is lowered. Ni and Cu are effective elements for strengthening steel. Therefore, the contents of Ni and Cu are preferably in the range of 0.05% or more and 2.0% or less, respectively.
- Ca 0.001% or more and 0.005% or less.
- REM 0.001% or more and 0.005% or less.
- Ca and REM are effective elements for spheroidizing the shape of the sulfide and improving the adverse effect of the sulfide on the stretch flangeability.
- the effect is obtained at 0.001% or more for each.
- a content exceeding 0.005% leads to an increase in inclusions, etc., and causes internal defects on the surface. Therefore, when Ca and REM are contained, the content is preferably in the range of 0.001% to 0.005%.
- the components other than the above are Fe and inevitable impurities. However, as long as the effects of the present invention are not impaired, the inclusion of components other than those described above is not rejected.
- the composition of the steel sheet of the present invention satisfies M ⁇ 300 ° C, which is a relational expression with the area ratio of polygonal ferrite, that is, manufacturing. This is preferable for suppressing variation in characteristics due to variation in conditions.
- the surface of the steel sheet may be provided with a molten zinc plated layer or an alloyed molten zinc plated layer.
- a steel slab adjusted to the above-mentioned preferred component composition is manufactured, hot-rolled, and then cold-rolled to obtain a cold-rolled steel sheet.
- these treatments are not particularly limited, and may be performed according to ordinary methods.
- preferable manufacturing conditions are as follows. After the billet was heated to 1 3 00 ° C or less than 1100 ° C, 870 ° C or higher 950T:. The following finishing hot rolling at a temperature, i.e. hot pressure a rolling finish temperature 870 ° C or higher 950 ° C The obtained hot-rolled steel sheet is rolled up at a temperature of 350 ° C or higher and 720 ° C or lower. Next, after pickling the hot-rolled steel sheet, it is cold-rolled at a rolling reduction of 40% or more and 90% or less to obtain a cold-rolled steel sheet.
- hot-rolled steel sheets are manufactured through normal steelmaking, forging, and hot rolling processes. For example, some or all of the hot rolling process is performed by thin forging. It may be omitted and manufactured.
- the obtained cold-rolled steel sheet is used for 15 seconds in the first temperature range of 700 ° C or more and 950 ° C or less, specifically in the austenite single-phase region or in the two-phase region of the austenite phase and ferrite phase.
- Annealing is performed for 600 seconds or less. If the annealing temperature is less than 700 ° C, or if the annealing time is less than 15 seconds, the carbide in the steel sheet will not dissolve sufficiently, or the recrystallization of the fly will not be completed, and the target ductility will be reduced. Stretch flangeability may not be obtained.
- the annealing temperature and annealing time should be in the range of 700 ° C to 950 ° C and 15 seconds to 600 seconds, respectively.
- Preferable annealing temperature and annealing time are 760 ° C to 920 ° C and 30 seconds to 400 seconds, respectively.
- the cold-rolled steel sheet after annealing is in the second temperature range from the first temperature range to 420 ° C.
- Cooling conditions in the second temperature range from the first temperature range to 420 ° C are important in order to suppress the precipitation of phases other than the intended ferritic tempered martensite phase.
- the temperature range from the first temperature range to 550 ° C is a temperature range where pearlite transformation is likely to occur.
- the average cooling rate from the first temperature range that is, from 700 ° C to 550 ° C, which is the lower limit temperature of the first temperature range, is less than 3 ° C / sec, perlite, etc. is deposited, and the target and Therefore, a cooling rate of 3 t / sec or more is necessary. Preferably, it is 5 ° C / second or more.
- the upper limit of the cooling rate is not particularly defined, a special cooling facility is required to obtain a cooling rate of 200 ° C / second or higher, and therefore 200 ° C / second or lower is preferable.
- the temperature range from 550 ° C to 420 ° C is the temperature range where the bainitic transformation proceeds by holding for a long time. If the time required for cooling from 520 ° C to 420 ° C exceeds 600 seconds, the targeted transformation may progress and the target structure may not be obtained. For this reason, the time required for cooling from 550 ° C to 420 ° C should be 600 seconds or less. A more preferable time is 400 seconds or less.
- the treatment in this second temperature range it leads to the third temperature range.
- the martensite transformation is generated, and at the same time, the tempering process is performed to temper the martensite after transformation, and the precipitation state of carbide in the interior is optimally controlled.
- Obtaining a martensite is the greatest feature of the present invention. Normal martensite is obtained by quenching with water cooling after annealing. This martensite is a hard phase and contributes to increasing the strength of the steel sheet but is inferior in workability. Therefore, in order to make this martensite a tempered martensite with good workability, it is common practice to reheat the tempered steel sheet for tempering.
- Figure 1 schematically shows the above process. In such a normal quenching / tempering process, after the martensite transformation is completed by quenching, the structure is tempered uniformly by raising the temperature and tempering.
- the autotempering process is a process that cools the third temperature range at a constant speed as shown in Fig. 2, and is extremely productive without quenching and tempering by reheating. It is a high method.
- a steel plate containing auto-tempered martensite obtained by this auto-tempering treatment has strength and workability equivalent to or higher than the steel plate tempered by quenching / reheating shown in Fig. 1.
- the auto-tempering process continuously and gradually advances the martensite transformation and its tempering by performing continuous cooling (including stepwise cooling and holding) in the third temperature range. It is possible to obtain a structure in which martensites with different tempering conditions are mixed.
- martensite with different tempering conditions has different properties such as strength and workability
- autotempering is not accompanied by rapid cooling to a low temperature range that completes all martensitic transformations, so that the residual stress in the steel sheet is small and it is advantageous to obtain a steel sheet with an excellent plate shape. It is.
- the third temperature range is 250 ° C. or more and 420 or less. In the temperature range above 420 ° C, the bainitic transformation is likely to occur as described above. On the other hand, in the temperature range below 250, autotempering takes a long time, so continuous annealing line or continuous molten zinc plating line. In this process, the progress of the autotemper is insufficient. In this third temperature range, martensite transformation occurs, and at the same time, the tempered martensite is tempered to make it a hot tempered martensite. Must be less than ° C / sec. If the cooling rate exceeds 50 ° C / sec, the autotempering process may be insufficient and the workability of martensite may not be ensured.
- the cooling rate is preferably 0.1 ° C / second or more.
- At least the temperature range of (Ms point 50) ° C or less is 1.0 ° C. It is preferable to cool at a cooling rate in the range of not less than 50 / C and not more than 50 ° C / second. This is because the precipitation of carbides in autotempered martensite is more appropriately controlled in the third temperature range, and the number of precipitations of iron-based carbides between ⁇ .
- ⁇ ⁇ ⁇ and 0.5 ⁇ is 1 This is because the ratio of the auto tempered martensite, which is 5 x 10 2 or less per mm 2 , is 3% or more in terms of the area ratio with respect to the entire auto tempered martensite.
- the cooling rate exceeds 50 ° C / sec, the progress of the phototemper is insufficient and the desired autotempered martensite cannot be obtained, and the workability of the martensite may not be ensured.
- the cooling rate should be 1.0 ° C / second or more.
- the Ms point can be obtained by measurement of thermal expansion during cooling or measurement of electrical resistance, as is usually done. Alternatively, M obtained by an approximate expression (1) of the Ms point described later may be used.
- the auto-tempering treatment can be performed stably.
- [X%] is the mass of alloy element X. / 0
- [ «%] is the area ratio (%) of polygonal ferrite.
- the ⁇ ⁇ ⁇ expressed by the above equation (1) is an approximate expression of the Ms point at which the martensitic transformation that is empirically determined starts.
- This M is greatly related to the precipitation behavior of iron carbide from the martensite. it is conceivable that. Therefore, M can be used as an indicator that can stably obtain a wheat tempered martensite containing 5 ⁇ 10 4 or more iron-based carbides of 5 nm or more and 0.5 ⁇ ⁇ ⁇ or less per lmm 2 .
- the area ratio of polygonal ferrite is measured by, for example, image processing analysis of SEM photographs of 1000 to 3 000 times. Polygonal ferrite is observed in the steel sheet after annealing and cooling under the above conditions. In order to increase the M to 300 ° C or more, after manufacturing a cold-rolled steel sheet having a desired component composition, the area ratio of polygonal ferrite is determined, and the alloy element content determined from the component composition of the steel sheet is combined with (1 Find the value of M from the formula.
- the polygonal ferrite In order to reduce the area ratio, for example, the annealing temperature in the first temperature range is set to a higher temperature, the average cooling rate from the first temperature range to 550 ° C is increased, and the desired heat treatment conditions are adjusted as appropriate. M may be obtained, and the content of the component composition in the formula (1) may be adjusted.
- the steel sheet of the present invention can be subjected to hot dip zinc alloying and galvannealing.
- the hot dip galvanizing and alloyed hot dip galvanizing treatments are preferably carried out in a continuous hot dip galvanizing line, satisfying the annealing and cooling conditions under the conditions described above.
- the hot dip galvanizing treatment and the alloying treatment are preferably performed in a temperature range of 420 ° C. or higher and 550 ° C. or lower.
- the temperature is 550 ° C.
- the time required for cooling from C to 420 ° C, that is, the holding time in the temperature range of 420 ° C to 550 ° C should be 600 seconds or less.
- the method of galvanizing and galvanizing hot dip galvanizing is as follows. First, let the steel plate enter the squeeze bath and adjust the amount of adhesion by gas wiping.
- the amount of dissolved A1 in the plating bath is in the range of 0.12% to 0.22% in the case of hot dip zinc, and in the range of 0.08% to 0.18% in the case of alloyed hot dip galvanizing.
- the temperature of the plating bath may be in the range of 450 ° C or higher and 500 ° C or lower.
- the temperature during alloying is preferably in the range of 450 ° C to 550 ° C.
- alloying temperature exceeds 550 ° C, carbides may precipitate excessively from the untransformed austenite or, in some cases, may become perlite, and the desired strength and ductility may not be obtained. In addition, powdering properties are also degraded. On the other hand, when the temperature during alloying is less than 450 ° C, alloying does not proceed.
- the plating adhesion amount is preferably 20 to 150 g / m 2 per side. If the amount of plating deposition is less than 20 g / m 2, the corrosion resistance is degraded. On the other hand, even if the plating adhesion amount exceeds 150 g / m 2 , the corrosion resistance is saturated, which only increases costs.
- the alloying degree is preferably 7 to 1 ⁇ % by mass in terms of Fe content in the plating layer. If the degree of alloying is less than 7% by mass, unevenness in alloying will occur and the appearance will deteriorate, or the so-called ⁇ phase will be generated and the slidability will deteriorate. On the other hand, if the degree of alloying exceeds 15% by mass, a large amount of hard and brittle ⁇ phase is formed and the plating adhesion deteriorates.
- the holding temperature in the first temperature range, the second temperature range, etc. must be set. However, it does not have to be constant, and even if it fluctuates within the specified range, the gist of the present invention is not impaired. The same applies to the cooling rate. Moreover, as long as the thermal history is satisfied, the steel sheet may be annealed and treated with an automatic tempering treatment by any equipment. Further, the present invention also includes temper rolling the steel plate of the present invention for shape correction after autotempering. Example
- the test was carried out under the conditions of (double-sided). In addition, galvannealed alloying was further alloyed under the condition that the Fe% (iron content) in the adhesion layer was 9% by mass.
- the obtained steel sheet was subjected to temper rolling at a rolling rate (elongation rate) of 0.3% regardless of the presence or absence of plating.
- As-quenched martensite (untempered martensite) and residual austenite were obtained using a sample that had been heat-treated at 200 ° C for 2 hours.
- the reason for preparing the sample that was heat-treated at 200 ° C for 2 hours was to distinguish martensite that was not tempered and residual austenite during SEM observation. In SEM observation, it is difficult to distinguish martensite that has not been tempered from residual austenite.
- iron-based carbides are formed in the martensite. The presence of these iron-based carbides makes it possible to distinguish from residual austenite.
- the heat treatment at 200 ° CX for 2 hours can temper the martensite without affecting the area other than the martensite, that is, without changing the area ratio of each phase. This makes it possible to distinguish from residual austenite.
- As a result of comparing SEM observations of both the polished sample and the sample heat-treated at 200 ° C for 2 hours it was confirmed that there was no change in the phases other than martensite.
- the size and number of iron carbides in the hot tempered martensite were measured by SEM observation. Needless to say, the sample was the same as that observed above, but the sample was not heat-treated at 200 ° C. for 2 hours. Depending on the precipitation state and size of the iron-based carbide, it was observed in the range of 10,000 to 30,000 times.
- the size of the iron-based carbide is evaluated by the average value of the major axis and minor axis of each precipitate, and the number of those whose size is 5 mn or more and 0.5 ⁇ ⁇ or less is counted. The number per 1 mm 2 was obtained. Observation was performed in 5 to 20 fields, and the average value was calculated from the total number of all fields in each sample to obtain the number of iron-based carbides in each sample (number per 1 mm 2 of autotempered martensite).
- JIS No. 5 test piece was cut out from the direction parallel to the rolling direction of the steel sheet, and the tensile test was conducted in accordance with JIS Z2241.
- Tensile strength (TS), yield strength (YS) and total elongation (T.E1) were measured, and the product of tensile strength and total elongation (TSXT.E1) to evaluate the balance between strength and elongation was calculated.
- TSXT.E1 ⁇ 14500 MPa-%) was determined to be good.
- the stretch flangeability was evaluated in accordance with Japan Iron and Steel Federation Standard JFST1001. After cutting each steel plate into lOOmmXIOOmm, clearance: punching out a 10mm diameter hole with 12% of the plate thickness, then using a 75mm diameter die, wrinkle holding force: 88.2kN, 60 ° Insert a conical punch into the hole, measure the hole diameter at the crack initiation limit, obtain the critical hole expansion rate (%) from the equation (2), and determine the stretch flangeability from this critical hole expansion rate value. evaluated. In the present invention, ⁇ 15% is considered good.
- Limit hole expansion rate ⁇ (%) ⁇ (D f -D 0 ) / D. ⁇ X100 ⁇ ⁇ '(2)
- D f is the hole diameter D when the crack occurs. Is the initial hole diameter.
- the steel sheet of the present invention pull ⁇ Strength: This is 900MPa or more, or, TS X T. E1 ⁇ 1 45 00 - shows the (MPa%) Oyopi Shinpi flangeability Since the average value is 15 % or more, it can be confirmed that both high strength and good workability are achieved.
- those having M of 300 ° C or higher are particularly excellent in that the stretch flangeability, particularly when the strength is increased, does not deteriorate.
- Sample Nos. 6 and 7 have a martensite hardness of 700 and HV, and the number of iron-based carbides in the strong martensite is less than 5 ⁇ 10 4 per mm 2 or contains iron-based carbides. Therefore, tensile strength: 900MPa or more is satisfactory, but the value is less than 15% and the workability is poor. This is because the cooling rate in the third temperature range of Sample Nos. 6 and 7 is high and does not satisfy the condition of 50 ° C / sec. In samples No. 3 and 8, the martensite hardness satisfies HV ⁇ 700, but the number of iron carbides in the martensite is less than 5 X 10 4 per mm 2 , indicating the tensile strength.
- the auto-tempered martensite with sufficient martensite hardness HV ⁇ 700 and the number of iron-based carbides in martensite being 5 x 10 4 or more per 1 mm 2 is sufficiently treated. It can be confirmed that the steel sheet of the present invention includes both high strength and workability.
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Abstract
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CA2713181A CA2713181C (en) | 2008-01-31 | 2009-01-29 | High strength steel sheet and method for manufacturing the same |
MX2010008227A MX2010008227A (es) | 2008-01-31 | 2009-01-29 | Lamina de acero de alta resistencia y metodo para su fabricacion. |
CN2009801038287A CN101932746B (zh) | 2008-01-31 | 2009-01-29 | 高强度钢板及其制造方法 |
US12/865,527 US20110030854A1 (en) | 2008-01-31 | 2009-01-29 | High-strength steel sheet and method for manufacturing the same |
EP09706046.1A EP2246456B9 (en) | 2008-01-31 | 2009-01-29 | High-strength steel sheet and process for production thereof |
KR1020107017843A KR101225321B1 (ko) | 2008-01-31 | 2009-01-29 | 고강도 강판 및 그 제조 방법 |
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KR20220169497A (ko) * | 2021-06-18 | 2022-12-28 | 주식회사 포스코 | 굽힘 특성이 우수한 고항복비 초고강도 강판 및 그 제조방법 |
Citations (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0693340A (ja) | 1992-09-14 | 1994-04-05 | Kobe Steel Ltd | 伸びフランジ性の優れた高強度合金化溶融亜鉛めっき鋼板の製造方法及び製造設備 |
JPH06108152A (ja) | 1992-09-30 | 1994-04-19 | Kobe Steel Ltd | 曲げ加工性に優れた高強度溶融亜鉛めっき鋼板の製造方法 |
JPH0711383A (ja) | 1993-06-28 | 1995-01-13 | Kobe Steel Ltd | 疲労特性に優れた複合組織鋼板 |
JPH07207413A (ja) | 1994-01-12 | 1995-08-08 | Nippon Steel Corp | 加工性に優れた引張強さ45〜65kgf/mm2 の高強度複合組織冷延鋼板とその製造方法 |
JP2616350B2 (ja) | 1992-08-07 | 1997-06-04 | 住友金属工業株式会社 | 超高張力冷延鋼板およびその製造方法 |
JP2621744B2 (ja) | 1992-08-24 | 1997-06-18 | 住友金属工業株式会社 | 超高張力冷延鋼板およびその製造方法 |
JPH1060593A (ja) | 1996-06-10 | 1998-03-03 | Kobe Steel Ltd | 強度−伸びフランジ性バランスにすぐれる高強度冷延鋼板及びその製造方法 |
JP2826058B2 (ja) | 1993-12-29 | 1998-11-18 | 株式会社神戸製鋼所 | 水素脆化の発生しない超高強度薄鋼板及び製造方法 |
JPH1161327A (ja) | 1997-08-06 | 1999-03-05 | Nippon Steel Corp | 耐衝突安全性と成形性に優れた自動車用高強度鋼板とその製造方法 |
JP2001207234A (ja) | 2000-01-25 | 2001-07-31 | Sumitomo Metal Ind Ltd | 高延性高穴拡げ性高張力鋼板およびその製造方法 |
JP3231204B2 (ja) | 1995-01-04 | 2001-11-19 | 株式会社神戸製鋼所 | 疲労特性にすぐれる複合組織鋼板及びその製造方法 |
JP2003505604A (ja) | 1999-07-31 | 2003-02-12 | ティッセンクルップ シュタール アクチェンゲゼルシャフト | 高強度鋼帯または鋼板およびその製造方法 |
JP2003213370A (ja) | 2002-01-11 | 2003-07-30 | Nippon Steel Corp | 形状凍結性と耐衝突特性に優れた高強度鋼板、高強度溶融亜鉛めっき鋼板及び高強度合金化溶融亜鉛めっき鋼板とその製造方法 |
JP2003213369A (ja) | 2002-01-11 | 2003-07-30 | Nippon Steel Corp | 伸びフランジ性と耐衝突特性に優れた高強度鋼板、高強度溶融亜鉛めっき鋼板及び高強度合金化溶融亜鉛めっき鋼板とその製造方法 |
JP2004256872A (ja) * | 2003-02-26 | 2004-09-16 | Jfe Steel Kk | 伸びおよび伸びフランジ性に優れる高張力冷延鋼板およびその製造方法 |
JP3610883B2 (ja) | 2000-05-30 | 2005-01-19 | 住友金属工業株式会社 | 曲げ性に優れる高張力鋼板の製造方法 |
JP2005171321A (ja) * | 2003-12-11 | 2005-06-30 | Jfe Steel Kk | 成形性および曲げ加工性に優れる超高強度鋼板及びその製造方法 |
JP2005256089A (ja) * | 2004-03-11 | 2005-09-22 | Nippon Steel Corp | 成形性および穴拡げ性に優れた溶融亜鉛めっき複合高強度鋼板およびその製造方法 |
JP2005264328A (ja) | 2004-02-19 | 2005-09-29 | Jfe Steel Kk | 加工性に優れた高強度鋼板およびその製造方法 |
JP2005281854A (ja) | 2004-03-01 | 2005-10-13 | Nippon Steel Corp | 穴拡げ性に優れた高強度高延性溶融亜鉛めっき鋼板およびその製造方法 |
JP2007138262A (ja) * | 2005-11-21 | 2007-06-07 | Jfe Steel Kk | 機械特性ばらつきの小さい高強度冷延鋼板およびその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DZ2532A1 (fr) * | 1997-06-20 | 2003-02-08 | Exxon Production Research Co | Procédé de soudage d'un métal de base pour produire un assemblage soudé et cet assemblage soudé. |
US6159312A (en) * | 1997-12-19 | 2000-12-12 | Exxonmobil Upstream Research Company | Ultra-high strength triple phase steels with excellent cryogenic temperature toughness |
TNSN99233A1 (fr) * | 1998-12-19 | 2001-12-31 | Exxon Production Research Co | Aciers de haute resistance avec excellente tenacite de temperature cryogenique |
GC0000233A (en) * | 2000-08-07 | 2006-03-29 | Exxonmobil Upstream Res Co | Weld metals with superior low temperature toughness for joining high strength, low alloy steels |
KR20070026882A (ko) * | 2001-06-06 | 2007-03-08 | 신닛뽄세이테쯔 카부시키카이샤 | 고가공(高加工)시의 내피로성, 내식성, 연성 및 도금부착성을 갖는 고강도 용융 아연 도금 강판 및 합금화 용융아연 도금 강판 |
US7597768B2 (en) * | 2002-04-02 | 2009-10-06 | Kabushiki Kaisha Kobe Seiko Sho | Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring and method of making thereof |
JP4470701B2 (ja) * | 2004-01-29 | 2010-06-02 | Jfeスチール株式会社 | 加工性および表面性状に優れた高強度薄鋼板およびその製造方法 |
US20050199322A1 (en) * | 2004-03-10 | 2005-09-15 | Jfe Steel Corporation | High carbon hot-rolled steel sheet and method for manufacturing the same |
WO2006004228A1 (ja) * | 2004-07-07 | 2006-01-12 | Jfe Steel Corporation | 高張力鋼板の製造方法 |
CA2531615A1 (en) * | 2004-12-28 | 2006-06-28 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | High strength thin steel sheet having high hydrogen embrittlement resisting property |
CN100554479C (zh) * | 2006-02-23 | 2009-10-28 | 株式会社神户制钢所 | 加工性优异的高强度钢板 |
CA2701903C (en) * | 2007-10-10 | 2017-02-28 | Nucor Corporation | Complex metallographic structured steel and method of manufacturing same |
-
2009
- 2009-01-27 JP JP2009015840A patent/JP5365217B2/ja active Active
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Patent Citations (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2616350B2 (ja) | 1992-08-07 | 1997-06-04 | 住友金属工業株式会社 | 超高張力冷延鋼板およびその製造方法 |
JP2621744B2 (ja) | 1992-08-24 | 1997-06-18 | 住友金属工業株式会社 | 超高張力冷延鋼板およびその製造方法 |
JPH0693340A (ja) | 1992-09-14 | 1994-04-05 | Kobe Steel Ltd | 伸びフランジ性の優れた高強度合金化溶融亜鉛めっき鋼板の製造方法及び製造設備 |
JPH06108152A (ja) | 1992-09-30 | 1994-04-19 | Kobe Steel Ltd | 曲げ加工性に優れた高強度溶融亜鉛めっき鋼板の製造方法 |
JPH0711383A (ja) | 1993-06-28 | 1995-01-13 | Kobe Steel Ltd | 疲労特性に優れた複合組織鋼板 |
JP2826058B2 (ja) | 1993-12-29 | 1998-11-18 | 株式会社神戸製鋼所 | 水素脆化の発生しない超高強度薄鋼板及び製造方法 |
JPH07207413A (ja) | 1994-01-12 | 1995-08-08 | Nippon Steel Corp | 加工性に優れた引張強さ45〜65kgf/mm2 の高強度複合組織冷延鋼板とその製造方法 |
JP3231204B2 (ja) | 1995-01-04 | 2001-11-19 | 株式会社神戸製鋼所 | 疲労特性にすぐれる複合組織鋼板及びその製造方法 |
JPH1060593A (ja) | 1996-06-10 | 1998-03-03 | Kobe Steel Ltd | 強度−伸びフランジ性バランスにすぐれる高強度冷延鋼板及びその製造方法 |
JPH1161327A (ja) | 1997-08-06 | 1999-03-05 | Nippon Steel Corp | 耐衝突安全性と成形性に優れた自動車用高強度鋼板とその製造方法 |
JP2003505604A (ja) | 1999-07-31 | 2003-02-12 | ティッセンクルップ シュタール アクチェンゲゼルシャフト | 高強度鋼帯または鋼板およびその製造方法 |
JP2001207234A (ja) | 2000-01-25 | 2001-07-31 | Sumitomo Metal Ind Ltd | 高延性高穴拡げ性高張力鋼板およびその製造方法 |
JP3610883B2 (ja) | 2000-05-30 | 2005-01-19 | 住友金属工業株式会社 | 曲げ性に優れる高張力鋼板の製造方法 |
JP2003213370A (ja) | 2002-01-11 | 2003-07-30 | Nippon Steel Corp | 形状凍結性と耐衝突特性に優れた高強度鋼板、高強度溶融亜鉛めっき鋼板及び高強度合金化溶融亜鉛めっき鋼板とその製造方法 |
JP2003213369A (ja) | 2002-01-11 | 2003-07-30 | Nippon Steel Corp | 伸びフランジ性と耐衝突特性に優れた高強度鋼板、高強度溶融亜鉛めっき鋼板及び高強度合金化溶融亜鉛めっき鋼板とその製造方法 |
JP2004256872A (ja) * | 2003-02-26 | 2004-09-16 | Jfe Steel Kk | 伸びおよび伸びフランジ性に優れる高張力冷延鋼板およびその製造方法 |
JP2005171321A (ja) * | 2003-12-11 | 2005-06-30 | Jfe Steel Kk | 成形性および曲げ加工性に優れる超高強度鋼板及びその製造方法 |
JP2005264328A (ja) | 2004-02-19 | 2005-09-29 | Jfe Steel Kk | 加工性に優れた高強度鋼板およびその製造方法 |
JP2005281854A (ja) | 2004-03-01 | 2005-10-13 | Nippon Steel Corp | 穴拡げ性に優れた高強度高延性溶融亜鉛めっき鋼板およびその製造方法 |
JP2005256089A (ja) * | 2004-03-11 | 2005-09-22 | Nippon Steel Corp | 成形性および穴拡げ性に優れた溶融亜鉛めっき複合高強度鋼板およびその製造方法 |
JP2007138262A (ja) * | 2005-11-21 | 2007-06-07 | Jfe Steel Kk | 機械特性ばらつきの小さい高強度冷延鋼板およびその製造方法 |
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KR101225321B1 (ko) | 2013-01-22 |
JP5365217B2 (ja) | 2013-12-11 |
EP2246456A4 (en) | 2014-04-23 |
JP2009203550A (ja) | 2009-09-10 |
EP2246456B9 (en) | 2016-12-21 |
MX2010008227A (es) | 2010-08-30 |
CA2713181A1 (en) | 2009-08-06 |
US20110030854A1 (en) | 2011-02-10 |
CN101932746A (zh) | 2010-12-29 |
EP2246456B1 (en) | 2015-08-12 |
CA2713181C (en) | 2013-12-10 |
CN101932746B (zh) | 2012-05-09 |
KR20100101697A (ko) | 2010-09-17 |
EP2246456A1 (en) | 2010-11-03 |
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