CN107109575A - 镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 - Google Patents
镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 Download PDFInfo
- Publication number
- CN107109575A CN107109575A CN201680005032.8A CN201680005032A CN107109575A CN 107109575 A CN107109575 A CN 107109575A CN 201680005032 A CN201680005032 A CN 201680005032A CN 107109575 A CN107109575 A CN 107109575A
- Authority
- CN
- China
- Prior art keywords
- steel sheet
- less
- layer
- oxide layer
- mean depth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 167
- 239000010959 steel Substances 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims description 58
- 238000004519 manufacturing process Methods 0.000 title claims description 43
- 238000007747 plating Methods 0.000 title abstract description 41
- 230000003111 delayed effect Effects 0.000 title abstract description 35
- 239000010410 layer Substances 0.000 claims abstract description 184
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 27
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 26
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 23
- 239000011247 coating layer Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 31
- 238000005554 pickling Methods 0.000 claims description 29
- 238000002791 soaking Methods 0.000 claims description 21
- 238000005097 cold rolling Methods 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 229910052748 manganese Inorganic materials 0.000 claims description 17
- 239000011701 zinc Substances 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 abstract description 16
- 239000008397 galvanized steel Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 description 23
- 238000012360 testing method Methods 0.000 description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 21
- 239000001257 hydrogen Substances 0.000 description 21
- 229910052739 hydrogen Inorganic materials 0.000 description 21
- 238000010438 heat treatment Methods 0.000 description 19
- 210000001519 tissue Anatomy 0.000 description 17
- 229910000859 α-Fe Inorganic materials 0.000 description 16
- 230000002829 reductive effect Effects 0.000 description 15
- 238000005246 galvanizing Methods 0.000 description 14
- 238000000576 coating method Methods 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 11
- 238000007598 dipping method Methods 0.000 description 11
- 238000005098 hot rolling Methods 0.000 description 11
- 238000005452 bending Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 8
- 238000005275 alloying Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 6
- 235000021110 pickles Nutrition 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000003556 assay Methods 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229920000178 Acrylic resin Polymers 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- -1 fluororesin Substances 0.000 description 3
- 238000001336 glow discharge atomic emission spectroscopy Methods 0.000 description 3
- 238000011534 incubation Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241000316887 Saissetia oleae Species 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001652 electrophoretic deposition Methods 0.000 description 1
- HQFCOGRKGVGYBB-UHFFFAOYSA-N ethanol;nitric acid Chemical compound CCO.O[N+]([O-])=O HQFCOGRKGVGYBB-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 150000002927 oxygen compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 210000002381 plasma Anatomy 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 239000000326 ultraviolet stabilizing agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
-
- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
-
- 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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- 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
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- 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
-
- 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
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
-
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- 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
- C21D2211/001—Austenite
-
- 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
-
- 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
-
- 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
-
- 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.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12583—Component contains compound of adjacent metal
-
- 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.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12583—Component contains compound of adjacent metal
- Y10T428/1259—Oxide
-
- 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.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12611—Oxide-containing component
-
- 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.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12611—Oxide-containing component
- Y10T428/12618—Plural oxides
-
- 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.]
- Y10T428/1266—O, S, or organic compound in metal component
-
- 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.]
- Y10T428/1266—O, S, or organic compound in metal component
- Y10T428/12667—Oxide of transition metal or Al
-
- 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
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
-
- 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
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
-
- 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
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12958—Next to Fe-base component
- Y10T428/12965—Both containing 0.01-1.7% carbon [i.e., steel]
-
- 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
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
-
- 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
- Y10T428/12993—Surface feature [e.g., rough, mirror]
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
- Y10T428/24967—Absolute thicknesses specified
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
- Y10T428/24967—Absolute thicknesses specified
- Y10T428/24975—No layer or component greater than 5 mils thick
-
- 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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
-
- 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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
-
- 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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
本发明提供一种镀覆性、弯曲性和扩孔性的加工性以及耐延迟断裂特性优异,而且耐冲击吸收性也优异的980MPa以上的热浸镀锌钢板及合金化热浸镀锌钢板。本发明的高强度镀覆钢板是在基底钢板的表面具有镀覆层的镀覆钢板,含有规定的钢成分,并且,自基底钢板与镀覆层之间的界面起,向基底钢板侧依次包含:软质层,在将所述基底钢板的板厚设为t时,具有所述基底钢板的t/4部位的维氏硬度的90%以下的维氏硬度;以及硬质层,包括以马氏体和贝氏体为主体的组织,并且,旧奥氏体的平均粒径为20μm以下,其中,软质层的平均深度D为20μm以上,内部氧化层的平均深度d为4μm以上且小于D。
Description
技术领域
本发明涉及一种抗拉强度为980MPa以上、镀覆性、包含弯曲性和扩孔性双方的加工性以及耐延迟断裂特性优异的高强度镀覆钢板及其制造方法。本发明的镀覆钢板包括热浸镀锌钢板及合金化热浸镀锌钢板双方。
背景技术
在汽车或运输机等领域中所通用的热浸镀锌钢板及合金化热浸镀锌钢板除了被要求高强度化以外,还被要求弯曲性及扩孔性(延伸凸缘性)的加工性优异,进一步被要求耐延迟断裂特性优异。而且,还被要求耐冲击吸收性。
为了确保高强度化和加工性,有效的是在钢中较多地添加Si或Mn等强化元素。然而,Si和Mn是易氧化性元素,由于形成在表面的Si氧化物、Mn氧化物、具有Si和Mn的复合氧化物的氧化膜等,热浸镀锌的润湿性明显变差,发生未镀覆等问题。
对此,针对含有较多Si或Mn的镀覆钢板,提出了各种提高加工性等的技术。
例如,在专利文献1中公开了抗拉强度为590MPa以上且弯曲性及加工部的耐蚀性优异的热浸镀锌钢板。详细而言,在专利文献1中,为了能够抑制自钢板与镀覆层之间的界面起形成在钢板侧的内部氧化层所引起的挠裂(flex crack)的产生和镀膜的损伤,将脱碳层的成长设为显著快于内部氧化层的成长。另外,还公开了以使在铁素体区域中因脱碳而形成的内部氧化层的厚度变薄的方式加以控制的表面附近组织。
此外,在专利文献2中公开了疲劳耐久性、耐氢脆性(与耐延迟断裂特性同义)、弯曲性优异的抗拉强度为770MPa以上的热浸镀锌钢板。详细而言,在专利文献2中,钢板部包括:与镀覆层的界面直接接触的软质层;以及以铁素体作为面积率最大的组织的软质层。另外,还公开了满足d/4≤D≤2d的热浸镀锌钢板,其中,D是所述软质层的厚度,d是存在于钢板表层部并含有Si和Mn中1种以上的氧化物从镀覆层/基底钢的界面算起的深度。
现有技术文献
专利文献
专利文献1:日本专利公开公报特开2011-231367号
专利文献2:日本专利公报第4943558号
发明内容
本发明要解决的问题
如上所述,至今为止已提出了各种使含有较多Si及Mn的镀覆钢板的加工性等提高的技术。然而,期望提供一种全部兼具该镀覆钢板被要求的各种特性、即:980MPa以上的高强度、镀覆性、弯曲性和扩孔性的加工性、以及耐延迟断裂特性,而且耐冲击吸收性也优异的技术。
本发明鉴于上述情况而作出,其目的在于提供一种镀覆性、弯曲性和扩孔性的加工性、以及耐延迟断裂特性优异,且耐冲击吸收性也优异的980MPa以上的热浸镀锌钢板及合金化热浸镀锌钢板及其制造方法。
用于解决问题的方案
能够解决上述问题的本发明所涉及的抗拉强度为980MPa以上的高强度镀覆钢板的要点在于,其是在基底钢板的表面具有热浸镀锌层或合金化热浸镀锌层的镀覆钢板,(1)所述基底钢板以质量%计含有C:0.05%至0.25%、Si:0.5%至2.5%、Mn:2.0%至4%、P:超过0%且0.1%以下、S:超过0%且0.05%以下、Al:0.01%至0.1%、N:超过0%且0.01%以下,余量是铁和不可避免的杂质,(2)自所述基底钢板与所述镀覆层之间的界面起,向基底钢板侧依次包含:内部氧化层,包含选自由Si和Mn构成的组中的至少一种的氧化物;软质层,包含所述内部氧化层,并且,在将所述基底钢板的板厚设为t时,具有所述基底钢板的t/4部位的维氏硬度的90%以下的维氏硬度;以及硬质层,包括以马氏体和贝氏体为主体的组织,并且,旧奥氏体的平均粒径为20μm以下,其中,所述软质层的平均深度D为20μm以上,所述内部氧化层的平均深度d为4μm以上且小于所述D。
在本发明的优选的实施方式中,所述基底钢板以质量%计还含有以下的(a)~(c)中的至少其中之一:(a)从由Cr:超过0%且1%以下、Mo:超过0%且1%以下和B:超过0%且0.01%以下所构成的组中选择的至少一种;(b)从由Ti:超过0%且0.2%以下、Nb:超过0%且0.2%以下和V:超过0%且0.2%以下所构成的组中选择的至少一种;(c)从由Cu:超过0%且1%以下和Ni:超过0%且1%以下所构成的组中选择的至少一种。
在本发明的优选的实施方式中,所述内部氧化层的平均深度d与所述软质层的平均深度D满足D>2d的关系。
此外,能够解决所述问题的本发明的制造方法的要点在于,用于制造所述的任一高强度镀覆钢板,所述制造方法依次包括:在600℃以上的温度下将满足所述的钢成分的钢板卷取的热轧步骤;以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;在氧化带中,以0.9至1.4的空气比进行氧化的步骤;在还原带中,在Ac3点至Ac3点+100℃的范围进行均热的步骤;以及均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。
另外,能够解决所述问题的本发明的另一制造方法的要点在于,用于制造所述的任一高强度镀覆钢板,所述制造方法依次包括:在500℃以上的温度下将满足所述的钢成分的钢板卷取的热轧步骤;在500℃以上的温度下保温80分钟以上的步骤;以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;在氧化带中,以0.9至1.4的空气比进行氧化的步骤;在还原带中,在Ac3点至Ac3点+100℃的范围进行均热的步骤;以及均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。
发明的效果
本发明的镀覆钢板自镀覆层与基底钢板之间的界面起,向基底钢板侧依次包括:包含选自由Si和Mn构成的组中的至少一种的氧化物的内部氧化层;包含该内部氧化层的区域的软质层;以及硬质层,该硬质层为所述软质层以外的区域,以马氏体与贝氏体为主体,且旧奥氏体的平均粒径为20μm以下,尤其将内部氧化层的平均深度d较厚地控制为4μm以上而有效利用为氢捕获部位,因此能够有效地抑制氢脆,制得弯曲性和扩孔性的加工性以及耐延迟断裂特性均优异的抗拉强度为980MPa以上的高强度镀覆钢板。较佳地,由于适宜控制了内部氧化层的平均深度d与包含该内部氧化层的区域的软质层的平均深度D的关系,因此尤其弯曲性及耐延迟断裂特性进一步提高。
附图说明
图1是示意性地说明在本发明的镀覆钢板中,自镀覆层与基底钢板之间的界面起至基底钢板侧的层结构的图。
图2是用于测定本发明的镀覆钢板中的内部氧化层的平均深度d的说明图。
图3是说明为了决定软质层的平均深度D而使用的维氏硬度的测定位置的图。
具体实施方式
本发明人为了提供一种具有980MPa以上的高强度并且镀覆性、加工性、耐延迟断裂特性、以及耐冲击吸收性均为优异的高强度镀覆钢板,其中基底钢板含有较多Si及Mn,特别关注自镀覆层与基底钢板之间的界面起至基底钢板侧的层结构而反复进行了研究。结果发现,如后述的图1的示意图所示,如果采用如下(I)和(II),则内部氧化层作为氢捕获部位发挥作用,能够有效地抑制氢脆,因此,能够实现所期望的目的,且优选将如下的(III)适当地控制,则尤其弯曲性及耐延迟断裂特性进一步提高,并完成了本发明,其中,所述(I)使自镀覆层与基底钢板之间的界面至基底钢板侧的层结构包括具备内部氧化层的软质层以及硬质层,该硬质层为所述软质层以外的区域,以马氏体与贝氏体为主体,旧奥氏体的平均粒径为20μm以下,其中所述内部氧化层含有选自由Si和Mn构成的组中的至少一种的氧化物;所述(II)将内部氧化层的平均深度d较厚地控制为4μm以上;所述(III)为所述内部氧化层的平均深度d与包含所述内部氧化层的区域的软质层的平均深度D之间的关系。
在本说明书中,镀覆钢板包含热浸镀锌钢板及合金化热浸镀锌钢板双方。此外,在本说明书中,基底钢板是指形成热浸镀锌层及合金化热浸镀锌层之前的钢板,区别于所述镀覆钢板。
此外,在本说明书中,高强度是指抗拉强度为980MPa以上。
此外,在本说明书中,加工性优异是指弯曲性及扩孔性均为优异。详细而言,在利用后述的实施例中所记载的方法测定这些特性时,将满足实施例的合格基准的称为“加工性优异”。
如上所述,本发明的镀覆钢板在基底钢板的表面具有热浸镀锌层或合金化热浸镀锌层(以下,有时用镀覆层来代表它们)。并且,本发明的特征部分在于自基底钢板与镀覆层之间的界面起,向基底钢板侧依次具有下述(A)至(C)的层结构。
(A)内部氧化层:其是包含选自由Si和Mn构成的组中的至少一种的氧化物的层。内部氧化层的平均深度d是4μm以上且小于后述的(B)中所记载的软质层的平均深度D。
(B)软质层:其包含所述内部氧化层,在将所述基底钢板的板厚设为t时,维氏硬度满足所述基底钢板的t/4部位的维氏硬度的90%以下。软质层的平均深度D为20μm以上。
(C)硬质层:其包含以马氏体与贝氏体为主体,且旧奥氏体的平均粒径为20μm以下的组织。在此,“作为主体”是指在利用后述的实施例中所记载的方法而测定组织分率时,贝氏体与马氏体的合计面积率为80面积%以上,并且,铁素体的面积率为0面积%以上且5面积%以下。
下面,参照图1,依次详细地说明对本发明赋予特征的所述(A)至(C)的层结构。如图1所示,本发明的镀覆钢板的基底钢板2侧的层结构从镀覆层1与基底钢板2之间的界面向基底钢板2侧包含:(B)的软质层4;以及(C)的硬质层5,该硬质层5比软质层4位于基底钢板2侧的内部。所述(B)的软质层4包含(A)的内部氧化层3。另外,所述软质层4与所述硬质层5连续地存在。
(A)关于内部氧化层
首先,直接接触于镀覆层1与基底钢板2的界面的部分具有平均深度d为4μm以上的内部氧化层3。在此,平均深度是指自所述界面算起的平均深度,对于其详细的测定方法,将在后述的实施例中使用图2加以说明。
所述内部氧化层3含有:包含Si和Mn中的至少一种的氧化物;以及因Si和Mn形成氧化物而其周围固溶Si和/或固溶Mn较少的Si及Mn贫化层。
本发明的最大特征在于将所述内部氧化层3的平均深度d较厚地控制为4μm以上。据此,可将该内部氧化层作为氢捕获部位来有效利用,可抑制氢脆,并且提高弯曲性、扩孔性以及耐延迟断裂特性。
另外,如本发明含有较多Si及Mn等易氧化性元素的基底钢板在退火时(后述的连续热浸镀锌生产线中的氧化还原步骤),在基底钢板表面容易形成Si与Mn的复合氧化膜,会降低镀覆性。对此,作为其对策,已知有如下的方法:在氧化气氛下使基底钢板的表面氧化而生成Fe氧化膜后,在含氢气氛中进行退火(还原退火)。而且,还已知如下的方法:通过控制炉内气氛而使易氧化性元素作为氧化物固定在基底钢板的表层内部,使固溶在基底钢板的表层的易氧化性元素减少,从而防止易氧化性元素在基底钢板的表面形成氧化膜。
然而,根据本发明人的研究结果可知:用于对含有较多Si及Mn的基底钢板进行镀覆的通用的氧化还原法中,在还原时的氢气氛下,氢渗入至基底钢板,从而发生因氢脆造成的弯曲性及扩孔性的降低,想要改善这些特性的降低,有效的是有效利用选自由Si和Mn构成的组中的至少一种的氧化物。详细而言,发现了可将所述氧化物用作氢捕获部位,其能在还原时防止氢渗入至基底钢板内部,可改善弯曲性和扩孔性以及耐延迟断裂特性,想要有效地发挥其效果,不可欠缺的是将含有所述氧化物的内部氧化层的平均深度d较厚地形成为4μm以上。
在本发明中,内部氧化层的平均深度d的上限至少小于后述的(B)的软质层的平均深度D。所述d的上限优选为30μm以下。其原因在于:想要使内部氧化层变厚,需要在热轧卷取后长时间保持于高温区域中,但是由于受到生产效率及设备上的限制,因此大概成为上述优选的值。所述d更优选为18μm以下,进一步优选为16μm以下。另外,所述d优选为6μm以上,更优选为8μm以上,进一步优选为超过10μm。
而且,在本发明中,优选:以使所述内部氧化层的平均深度d与后述的(B)的软质层的平均深度D的关系满足D>2d的关系式的方式控制该内部氧化层的平均深度d,据此,弯曲性及耐延迟断裂特性提高,尤其弯曲性进一步提高。相对于此,在所述的专利文献2中公开了满足d/4≤D≤2d的热浸镀锌钢板,其中,氧化物所存在的深度d及软质层的厚度D大致对应于本发明中记载的内部氧化层的平均深度d及软质层的平均深度D,专利文献2的控制方针与本发明中规定的所述关系式(D>2d)完全不同。而且,所述专利文献2基本上记载了在满足所述的d/4≤D≤2d的关系的基础上控制氧化物所存在的深度d的范围,因此完全没有本发明所示的将内部氧化层的平均深度d较厚地控制为4μm以上的基本构思。当然,也没有记载据此而有效地发挥作为氢捕获部位的作用,以使弯曲性、扩孔性及耐延迟断裂特性提高的本发明的效果。
另外,在本发明中,想要将所述内部氧化层的平均深度d控制为4μm以上,则需要将进入连续热浸镀锌生产线之前的冷轧钢板的内部氧化层的平均深度控制为4μm以上。详细内容将在后面的制造方法中叙述。即,如后述的实施例所示,酸洗、冷轧后的内部氧化层被继承到进入镀覆生产线后最终获得的镀覆钢板中的内部氧化层。
(B)关于软质层
在本发明中,如图1所示,软质层4是包含所述(A)的内部氧化层3的区域的层,且维氏硬度满足基底钢板2的t/4部位的维氏硬度的90%以下。所述维氏硬度的详细的测定方法将在后述的实施例中加以说明。
所述软质层是维氏硬度比后述的(C)的硬质层低的软质的组织,变形能力优异,尤其使弯曲性提高。即,在弯曲加工时,基底钢板的表层部成为断裂的起点,但如本发明所示,通过在基底钢板的表层形成规定的软质层,尤其使弯曲性得到改善。而且,通过形成所述软质层,能够防止所述(A)内的氧化物成为弯曲加工时断裂的起点,能够仅享有所述的作为氢捕获部位的优点。其结果,不仅弯曲性进一步提高,而且耐延迟断裂特性也进一步提高。
为了有效地发挥这种软质层的形成所带来的效果,将所述软质层的平均深度D设为20μm以上。所述D优选为22μm以上,更优选为24μm以上。另一方面,如果所述软质层的平均深度D过厚,则镀覆钢板自身的强度降低,因此,优选将其上限设为100μm以下。所述D更优选为60μm以下。
(C)关于硬质层
在本发明中,如图1所示,硬质层形成在所述(B)的软质层4的基底钢板2侧,并且包含以马氏体与贝氏体为主体,旧奥氏体的平均粒径为20μm以下的微细的组织。所述硬质层5的马氏体也可以是回火后的马氏体。其中,“作为主体”是指,在利用后述的实施例中所记载的方法而测定组织分率时,相对于组织整体,贝氏体与马氏体的合计面积率为80面积%以上,并且,相对于组织整体,铁素体的面积率为0面积%以上且5面积%以下。硬质层的贝氏体与马氏体的合计面积率越大越好,优选为93面积%以上。另一方面,铁素体的面积率越小越好,优选为5面积%以下,更优选为3面积%以下,最优选为0面积%。
根据本发明人的研究可知,如果使旧奥氏体粒径变小,则弯曲性、扩孔性的加工性以及耐延迟断裂特性得到改善。这是因为,如果旧奥氏体粒粗大,因应力集中而容易发生裂纹,但是,通过使旧奥氏体微细化,缓和应力集中,能够抑制裂纹的发生。
为了如此地确保弯曲性、扩孔性的加工性以及耐延迟断裂特性,有效的是实现旧奥氏体的微细化。根据此种观点,需要将旧奥氏体的平均粒径设为20μm以下。优选为18μm以下,更优选为16μm以下。旧奥氏体的平均粒径的下限根据所述观点并不特别限定,但考虑实际操作的生产线的制造能力及生产效率,优选3μm左右。
硬质层除了上述组织以外,还可以在不损及本发明的作用的范围内包含在制造时不可避免地混入的组织,例如残余奥氏体(γ)、珠光体等。所述组织最大也为15面积%以下,越少越好。另外,所述组织在后述的表3中记载为“其它”。
通过形成所述硬质层,弯曲性及扩孔性得以提高。即,一般而言,由于在软质相(例如铁素体)与硬质相(例如马氏体及贝氏体)的界面发生应力集中而导致挠裂或扩孔时的裂纹。因此,为了抑制所述裂纹,需要减少软质相与硬质相之间的硬度差。对此,在本发明中,将软质的铁素体在基底钢板内部的组织中所占的比率抑制为最大5面积%以下,制成以贝氏体和马氏体为主体的硬质层。而且,在所述硬质层中,由于抑制了铁素体的比率,因此降伏比(YR)变高,耐冲击吸收性也得以提高。
另外,本发明的硬质层只要如上所述地将贝氏体和马氏体作为主体而含有即可,贝氏体与马氏体的各自的比率无任何限定。其原因在于:在本发明中,只要满足所述必要条件,就可以发挥硬质层的形成所带来的所述效果。因此,所述硬质层只要满足所述必要条件,都可以满足贝氏体>马氏体、贝氏体=马氏体、贝氏体<马氏体的任意关系。另外,仅包含贝氏体而完全不含马氏体的情况以及仅包含马氏体而完全不含贝氏体的情况都被包含在本发明的范围内。从所述观点考虑,在后述的实施例中,并未区别观察贝氏体与马氏体,而仅测定合计面积,并将该测定的结果表示于表3中。
以上说明了最能让本发明具有特征的从镀覆层与基底钢板的界面起,向基底钢板侧的层结构。
接着,对于本发明所使用的钢成分加以说明。
本发明的镀覆钢板含有C:0.05%至0.25%、Si:0.5%至2.5%、Mn:2.0%至4%、P:超过0%且0.1%以下、S:超过0%且0.05%以下、Al:0.01%至0.1%、N:超过0%且0.01%以下,余量是铁和不可避免的杂质。
C:0.05%至0.25%
C是用于提高淬火性,也对马氏体带来硬化效果,对钢的高强度化而言是重要的元素。为了有效地发挥这效果,将C含量的下限设为0.05%以上。C含量的下限优选为0.08%以上,更优选为0.10%以上。然而,如果过多地添加C,则软质相与硬质相的硬度差变大,加工性及耐延迟断裂特性降低,因此将C含量的上限设为0.25%。C含量的上限优选为0.2%以下,更优选为0.18%以下。
Si:0.5%至2.5%
Si是通过固溶强化而提高钢的强度,并且对于加工性的提高而言是有效的元素。另外,生成内部氧化层,还具有抑制氢脆的作用。为了有效地发挥这效果,将Si含量的下限设为0.5%以上。Si含量的下限优选为0.75%以上,更优选为1%以上。然而,Si是铁素体生成元素,如果过多地添加Si,则不能抑制铁素体的生成,软质相与硬质相的硬度差变大,加工性降低。而且,镀覆性也变差,因此将Si含量的上限设为2.5%。Si含量的上限优选为2%以下,更优选为1.8%以下。
Mn:2.0%至4%
Mn是淬火性提高元素,抑制铁素体及贝氏体,生成马氏体,有助于高强度化。为了有效地发挥这效果,将Mn含量的下限设为2.0%以上。Mn含量的下限优选为2.3%以上,更优选为2.5%以上。然而,如果过多地添加Mn,则镀覆性降低,而且偏析也变显著。进一步,还会助长P的晶界偏析。因此,将Mn含量的上限设为4%。Mn含量的上限优选为3.5%以下。
P:超过0%且0.1%以下
P是作为固溶强化元素而对钢的强化有用的元素。为了有效地发挥这效果,将P含量的下限设为超过0%。然而,如果过多地添加,则不仅使加工性降低,还会带来焊接性和韧性的降低,因此将其上限设为0.1%以下。P含量较少为宜,优选为0.03%以下,更优选为0.015%以下。
S:超过0%且0.05%以下
S是不可避免地含有的元素,生成MnS等硫化物,该硫化物成为断裂的起点,有可能使加工性降低。因此,将S含量的上限设为0.05%以下。S含量较少为宜,优选为0.01%以下,更优选为0.008%以下。
Al:0.01%至0.1%
Al作为脱氧剂而起作用。另外,Al与N结合而成为AlN,通过使奥氏体粒径微细化,使加工性及耐延迟断裂特性提高。为了有效地发挥这作用,将Al含量的下限设为0.01%以上。Al含量的下限优选为0.02%以上,更优选为0.03%以上。然而,如果过多地添加Al,则使氧化铝等夹杂物增加而造成加工性降低,也带来韧性的降低。因此,将Al含量的上限设为0.1%。Al含量的上限优选为0.08%以下,更优选为0.05%以下。
N:超过0%且0.01%以下
N是不可避免地含有的元素,然而如果含量过多则加工性降低。而且,在钢中添加B(硼)的情况下,生成BN析出物,阻碍B的淬火性提高作用,因此尽可能地减少N为宜。因此,将N含量的上限设为0.01%以下。N含量的上限优选为0.008%以下,更优选为0.005%以下。
本发明的镀覆钢板含有所述成分,余量是铁和不可避免的杂质。
另外,本发明也可以含有如下的选择性元素。
选自由Cr:超过0%且1%以下、Mo:超过0%且1%以下和B:超过0%且0.01%以下构成的组中的至少一种
这些元素是对于钢板的强度上升而言有效的元素。这些元素既可以单独添加,也可以并用两种以上。
详细而言,Cr使淬火性提高,有助于强度上升。而且,Cr抑制渗碳体的生成和成长,有助于改善弯曲性。为了有效地发挥这作用,将Cr含量的优选的下限设为0.01%以上。然而,如果过多地添加Cr,则镀覆性降低。而且过多地生成Cr碳化物,造成加工性降低。因此,Cr含量的上限优选为1%以下。更优选为0.7%以下,进一步优选为0.4%以下。
Mo对于高强度化而言有效,因此,Mo含量的下限优选为0.01%以上。然而,如果过多地添加Mo,则所述作用饱和,使成本变高。因此,Mo的上限优选为1%以下。更优选为0.5%以下,进一步优选为0.3%以下。
B与Mn同样是淬火性提高元素,是抑制铁素体及贝氏体,生成马氏体,有助于高强度化的元素。为了有效地发挥这效果,B含量的下限优选为0.0002%以上,更优选为0.0010%以上。然而,如果B含量过多,则使热加工性降低,因此,B含量的上限优选为0.01%以下。更优选为0.0070%以下,进一步优选为0.0050%以下。
选自由Ti:超过0%且0.2%以下、Nb:超过0%且0.2%以下和V:超过0%且0.2%以下构成的组中的至少一种
这些元素是对于组织微细化所带来的加工性及耐延迟断裂特性的提高而言有效的元素。这些元素既可以单独添加,也可以并用两种以上。
为了有效地发挥上述作用,Ti、Nb、V各自的下限优选为0.01%以上。然而,如果各元素的含量过多,则生成铁素体,使加工性降低,因此,各元素的上限优选为0.2%以下。各元素更优选为0.15%以下,进一步优选为0.10%以下。
选自由Cu:超过0%且1%以下和Ni:超过0%且1%以下构成的组中的至少一种
Cu及Ni是对于高强度化而言有效的元素。这些元素既可以单独添加,又可以并用。
为了有效地发挥上述作用,Cu、Ni各自的下限优选为0.01%以上。然而,如果各元素的含量过多,则使热加工性降低,因此,各元素的上限优选为1%以下。各元素更优选为0.8%以下,进一步优选为0.5%以下。
以上,对本发明的钢成分进行了说明。
下面,对于制造本发明的镀覆钢板的方法加以说明。本发明的制造方法包括:在热轧卷取后,不保温而立即进行酸洗的第一方法;以及在热轧卷取后进行保温,然后进行酸洗的第二方法。根据保温的有无,第一方法(无保温)与第二方法(有保温)的热轧卷取温度的下限互不相同,除此以外的步骤相同。以下加以详述。
[第一制造方法(无保温)]
本发明所涉及的第一制造方法大致分为:热轧步骤;酸洗冷轧步骤;以及在连续热浸镀锌生产线(CGL(Continuous Galvanizing Line))中的氧化步骤、还原步骤和镀覆步骤。并且,本发明的特征部分在于依次包括:在600℃以上的温度下将满足所述钢成分的钢板卷取,从而获得形成有内部氧化层的热轧钢板的热轧步骤;以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;在氧化带中,以0.9至1.4的空气比进行氧化的步骤;在还原带中,在Ac3点至Ac3点+100℃的范围进行均热的步骤;以及均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。
以下,按照步骤顺序加以说明。
首先,准备满足所述钢成分的热轧钢板。热轧只要按照常用方法进行即可,例如,为了防止奥氏体粒的粗化,加热温度优选为1150℃至1300℃左右。另外,优选将终轧温度大概控制为850℃至950℃。
并且,在本发明中,重要的是将热轧后的卷取温度控制为600℃以上。据此,在基底钢板表面形成内部氧化层,且通过脱碳还形成软质层,因此,能够在镀覆后的钢板中获得所期望的内部氧化层和软质层。在卷取温度低于600℃的情况下,不能充分地生成内部氧化层及软质层。而且,热轧钢板的强度变高,冷轧性降低。卷取温度优选为620℃以上,更优选为640℃以上。但是,如果卷取温度过高,则黑氧化皮(black scale)过于成长,不能通过酸洗而溶解,因此其上限优选为750℃以下。
然后,对如上所述地获得的热轧钢板进行酸洗和冷轧,使内部氧化层的平均深度d保留4μm以上。据此,不仅保留内部氧化层,而且保留软质层,因此,镀覆后容易生成所期望的软质层。通过控制酸洗条件而控制内部氧化层的厚度是公知的方案,具体而言,根据所使用的酸洗液的种类、浓度等,适宜地控制酸洗的温度、时间等,以便能够确保所期望的内部氧化层的厚度。
例如作为酸洗液,可以使用盐酸、硫酸、硝酸等无机酸。
此外,一般而言,如果酸洗液的浓度或温度高或者酸洗时间长,则存在内部氧化层溶解而变薄的倾向。相反地,如果酸洗液的浓度或温度低或者酸洗时间短,则通过酸洗不能充分去除黑氧化皮层。因此,例如在使用盐酸的情况下,推荐将浓度控制为约3%至20%,将温度控制为60℃至90℃,将时间控制为约35秒至200秒。
另外,酸洗槽数并无特别限定,可以使用多个酸洗槽。而且,还可以在酸洗液中添加例如胺等酸洗抑制剂、即抑制剂或者酸洗促进剂等。
在酸洗后,以使内部氧化层的平均深度d保留4μm以上的方式进行冷轧。优选的冷轧条件是将冷轧率控制为约20%至70%的范围内。
接着,进行氧化及还原。
详细而言,首先在氧化带中,以0.9至1.4的空气比进行氧化。空气比(air ratio)是实际被供给的空气量与用于使被供给的燃烧气体完全燃烧的理论上所需的空气量的比。如果空气比高于1则氧处于过剩状态,如果空气比低于1则氧处于不足状态。在后述的实施例中使用CO气体来作为燃烧气体。
通过在空气比成为所述范围的气氛下进行氧化,从而脱碳得以促进,因此能够形成所期望的软质层,弯曲性得到改善。而且,能够在表面生成Fe氧化膜,能够抑制对镀覆性带来不良影响的复合氧化膜等的生成。如果空气比小于0.9,则脱碳不充分,不能形成充分的软质层,因此弯曲性降低。而且,所述Fe氧化膜的生成不充分,不能抑制所述复合氧化膜等的生成,从而镀覆性降低。所述空气比需要控制为0.9以上,优选控制为1.0以上。另一方面,如果空气比高达超过1.4,则过多地生成Fe氧化膜,在后续的还原炉中不能够充分还原,镀覆性降低。所述空气比需要控制为1.4以下,优选控制为1.2以下。
在所述氧化带中,空气比的控制特别重要,除此以外的条件可以采用通常所使用的方法。例如,所述氧化温度的下限优选为500℃以上,更优选为750℃以上。另外,所述氧化温度的上限优选为900℃以下,更优选为850℃以下。
接着,在还原带中,在氢气氛下对氧化膜进行还原。在本发明中,为了抑制铁素体来获得所期望的硬质层,需要在奥氏体单相区加热,并在Ac3点至Ac3点+100℃的范围内进行均热处理。如果均热温度低于Ac3点则铁素体过量,而如果超过Ac3点+100℃,则奥氏体粗大而加工性降低。优选的均热温度为Ac3点+15℃以上且Ac3点+85℃以下。
而且,为了获得旧奥氏体的平均粒径为20μm以下的硬质层,将500℃起至Ac3点的温度范围以3℃/秒以上的平均升温速度加热。如果平均升温速度低于3℃/秒,则旧奥氏体的平均粒径变大,弯曲性、扩孔性的加工性以及耐延迟断裂特性降低。平均升温速度的下限优选为4℃/秒以上,更优选为5℃/秒以上。平均升温速度的上限并不特别限定,但考虑到基底钢板温度的控制容易性、设备成本等,优选为20℃/秒以下,更优选为18℃/秒以下。
在本发明中,重要的是至少将所述温度范围以3℃/秒以上的平均升温速度加热,偏离所述温度范围的温度区域(低于500℃的温度区域或超过Ac3点的温度区域)的平均升温速度并不特别限定,与所述同样,可为3℃/秒以上的平均升温速度,或者也可为低于3℃/秒的平均升温速度。例如,所述“500℃起至Ac3点的温度范围”优选相当于氧化带的温度区域,但是也可以在氧化带以3℃/秒以上的平均升温速度加热后,直接以3℃/秒以上的平均升温速度在还原带加热。
另外,在本发明中,Ac3点基于下述式(i)计算。式中[]表示各元素的含量(质量%)。该式在《莱斯利钢铁材料学》(丸善株式会社发行,William C.Leslie著,p273)中有记载。
Ac3(℃)=910-203×[C]1/2-15.2×[Ni]+44.7×[Si]+104×[V]+31.5×[Mo]+13.1×[W]-{30×[Mn]+11×[Cr]+20×[Cu]-700×[P]-400×[Al]-120×[As]-400×[Ti]} (i)
在所述还原炉中,均热温度的控制特别重要,除此以外的条件可以采用通常所使用的条件。例如,优选:还原带的气氛包含氢和氮,并且将氢浓度控制为约5体积%至25体积%的范围。另外,优选将露点控制为-30℃至-60℃。
此外,如果均热处理时的保持时间短,则还原不充分而镀覆性降低,如果时间长,则旧奥氏体粒有可能变得粗大。考虑到这些,优选的保持时间例如为10秒以上且100秒以下,更优选为30秒以上且80秒以下。
接着进行冷却。冷却时的平均冷却速度控制为5℃/秒以上,以便能够抑制铁素体的生成。优选为8℃/秒以上,更优选为10℃/秒以上。平均冷却速度的上限并不特别限定,但是考虑到基底钢板温度的控制容易性及设备成本等,优选大致控制为100℃/秒以下。更优选的平均冷却速度为50℃/秒以下,进一步优选为30℃/秒以下。
冷却停止温度为不生成铁素体的温度区域为止即可,例如优选冷却至550℃以下。冷却停止温度的优选的下限例如为450℃以上,更优选为460℃以上,进一步优选为470℃以上。
在本发明中,重要的是适当控制至少所述冷却停止温度为止的平均冷却速度,之后的冷却方法并不限定于所述方法。例如,在冷却后加热至热浸镀锌时的镀浴温度的情况下,也可低于所述优选的冷却停止温度而冷却(例如,参照后述的表1的No.11)。或者,也可以冷却至规定温度后进行水冷。
然后,依照常用方法进行热浸镀锌。热浸镀锌的方法并不特别限定,例如,所述镀浴温度的下限优选为400℃以上,更优选为440℃以上。另外,所述镀浴温度的上限优选为500℃以下,更优选为470℃以下。镀浴的组成并不特别限定,采用公知的热浸镀锌浴即可。此外,热浸镀锌后的冷却条件也不特别限定,例如,优选将常温为止的平均冷却速度控制为约1℃/秒以上,更优选为5℃/秒以上。所述平均冷却速度的上限并无特别规定,但考虑到基底钢板温度的控制的容易性及设备成本等,优选控制为约50℃/秒以下。所述平均冷却速度优选为40℃/秒以下,更优选为30℃/秒以下。
而且,根据需要,也可以通过常用方法实施合金化处理。据此,获得合金化热浸镀锌钢板。合金化处理的条件也并不特别限定,例如在所述条件下进行热浸镀锌后,优选在500℃至600℃左右下,尤其优选在530℃至580℃左右下,保持5秒至30秒左右,尤其优选保持10秒至25秒左右。如果低于所述范围,则合金化变得不充分,另一方面,如果超过所述范围,则合金化过度进展,在镀覆钢板的冲压成型时有可能发生镀覆层剥离。而且,铁素体也容易生成。合金化处理例如可以使用加热炉、直接烘烤或红外线加热炉等来进行。加热方法也并不特别限定,例如可以采用气体加热、感应加热器加热(即,利用高频感应加热装置的加热)等惯用的方法。
在合金化处理后,依照常用方法进行冷却,从而获得合金化热浸镀锌钢板。优选将常温为止的平均冷却速度控制为约1℃/秒以上。
[第二制造方法(有保温)]
本发明所涉及的第二制造方法依次包括如下步骤:在500℃以上的温度下将满足所述钢成分的热轧钢板卷取的热轧步骤;在500℃以上的温度下保温80分钟以上的步骤;以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;在氧化带中,以0.9至1.4的空气比进行氧化的步骤;在还原带中,在Ac3点至Ac3点+100℃的范围内进行均热的步骤;以及均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。与所述的第一制造方法相比,所述第二制造方法与所述第一制造方法的不同点仅在于:将热轧后的卷取温度的下限设为500℃以上;在热轧步骤后设置保温步骤。因此,以下仅对该不同点加以说明。关于与所述第一制造方法一致的步骤,参照所述第一制造方法即可。
如上所述地设置保温步骤的理由在于:通过保温,能够在可氧化的温度区域保持长时间,能够扩大可获得所期望的内部氧化层和软质层的卷取温度范围的下限。此外,还具有通过减少基底钢板的表层与内部的温度差而提高基底钢板的均一性的优点。
首先,在所述第二制造方法中,将热轧后的卷取温度控制为500℃以上。在所述第二制造方法中,如后详述,在其后设置保温步骤,因此能够将卷取温度设定得低于所述的第一制造方法中的卷取温度的下限600℃。优选的卷取温度为540℃以上,更优选为570℃以上。另外,卷取温度的优选的上限与所述的第一制造方法相同,优选为750℃以下。
然后,在500℃以上的温度下将如上所述地获得的热轧钢板保温80分钟以上。据此,能够获得所期望的内部氧化层。为了有效地发挥保温带来的所述效果,优选将所述热轧钢板例如放入具有隔热性的装置中进行保温。本发明中所使用的所述装置只要由隔热性材料制成就无特别限定,作为此种材料,优选使用例如陶瓷纤维等。
为了有效地发挥所述效果,需要在500℃以上的温度下保温80分钟以上。优选的温度为540℃以上,更优选为560℃以上。此外,优选的时间为100分钟以上,更优选为120分钟以上。另外,考虑到酸洗性、生产效率等,优选将所述温度及时间的上限大概控制为700℃以下、500分钟以下。
以上,对本发明所涉及的第一及第二制造方法进行了说明。
对于通过所述制造方法获得的本发明的镀覆钢板,也可以进一步进行:各种涂装和涂装基层处理,例如进行磷酸盐处理等的化学转化处理;以及有机涂层处理,例如进行薄膜层叠之类的有机涂层的形成等。
对于各种涂装中所使用的涂料,可以使用公知的树脂,例如环氧树脂、氟树脂、硅丙烯酸树脂(silicone acrylic resin)、聚氨酯树脂、丙烯酸树脂、聚酯树脂、酚树脂、醇酸树脂、三聚氰胺树脂等。从耐蚀性的观点考虑,优选为环氧树脂、氟树脂、硅丙烯酸树脂。还可以与所述树脂一同使用硬化剂。而且,涂料还可以含有公知的添加剂,例如着色用颜料、偶联剂、均化剂、增效剂(intensifier)、抗氧化剂、紫外线稳定剂、阻燃剂等。
在本发明中,涂料的形态并不特别限定,可以使用任意形态的涂料,例如溶剂系涂料、水系涂料、水分散型涂料、粉体涂料、电泳涂料等。此外,涂装方法也并不特别限定,可以采用浸渍法、辊涂法、喷雾法、幕式淋涂法、电泳涂装法等。镀覆层、有机涂层、化学转化处理涂层、涂膜等包覆层的厚度可根据用途适宜设定。
本发明的高强度镀覆钢板的强度超高,且加工性(弯曲性及扩孔性)、耐延迟断裂特性优异,因此可以用于汽车用强度部件,例如前部或后部的纵梁、碰撞吸能盒等碰撞部件、以及中柱加强件等支柱类、车顶边梁加强件、侧梁、地板部件、脚踩部等车体构成部件。
本申请基于2015年1月9日申请的日本国专利申请第2015-003469号要求优先权的利益。将2015年1月9日申请的日本国专利申请第2015-003469号的说明书的全部内容引入本申请作为参考。
实施例
以下,列举实施例更具体地说明本发明,但本发明不受下述实施例的限制,当然还可以在可符合所述及后述的主旨的范围内加以变更来实施,这些也都包含在本发明的技术范围内。
将具有下述表1所示的成分组成且余量是铁和不可避免的杂质的板坯加热至1250℃,在终轧温度900℃下热轧为2.4mm后,在表2所示的温度下进行了卷取。
对于一部分的例No.25~27、32,之后放入到陶瓷纤维隔热装置中以表2所示的条件进行了保温。500℃以上的保温时间使用安装在线圈外周部的热电偶来测定。
接着,在以下条件下对如上所述地获得的热轧钢板进行了酸洗,然后以50%的冷轧率进行了冷轧。冷轧后的板厚为1.2mm。
酸洗液:10%盐酸、温度:82℃、酸洗时间:如表2所示。
接着,在连续热浸镀锌生产线中,以下述表2所示的条件下进行了退火(氧化、还原)及冷却。在此,连续热浸镀锌生产线中设置的氧化炉的温度被设为800℃,还原炉中的氢浓度设为20体积%,余量是氮和不可避免的杂质,并且露点控制为-45℃。此外,在表2所示的均热温度下的保持时间均设为50秒。
然后,除了下述的No.10、11以外,浸渍于460℃的镀锌浴后,以10℃/秒的平均冷却速度冷却至室温,获得了热浸镀锌钢板(GI)(No.23)。关于合金化热浸镀锌钢板(GA),在浸渍于所述镀锌浴中而实施热浸镀锌后,加热至500℃,在该温度下保持20秒而进行了合金化处理,然后以10℃/秒的平均冷却速度冷却至室温(No.1~9、12~22、24~33)。
另外,在No.10,冷却至表2中所记载的冷却停止温度200℃后,加热至460℃,然后浸渍于镀锌浴中,通过与上述同样的方法获得了GA钢板。此外,在No.11,如表2所示,以10℃/秒的平均冷却速度冷却至600℃后,进行水冷(WQ(Water-Quenching)),其后加热至460℃,然后浸渍于镀锌浴中,通过与所述同样的方法获得了GA钢板。
对于如上所述地获得的镀覆钢板即GI或GA评价了以下特性。另外,内部氧化层的平均深度如下所述地不仅对镀覆钢板进行了测定,而且对酸洗、冷轧后的基底钢板也同样地进行了测定,以供参考。这是为了确认通过控制热轧后的卷取温度、酸洗条件等,在退火前的冷轧钢板中已经获得所期望的内部氧化层的平均深度。
(1)镀覆钢板中的内部氧化层的平均深度d的测定
设镀覆钢板的板宽为W,从W/4的部位采集了尺寸为50mm×50mm的试片,然后,利用辉光放电发光分析法(GD-OES(Glow Discharge-Optical Emission Spectroscopy)),针对从镀覆层表面起的O含量、Fe含量及Zn含量分别进行了分析,并进行了定量。详细而言,利用堀场制作所制造的GD-PROFILER2型GDA750的GD-OES装置,在Ar辉光放电区域内对所述试片的表面进行了高频溅射,对所溅射的O、Fe、Zn各元素在Ar等离子体内的发光线连续地进行分光,从而测定了基底钢板的深度方向的各元素量的分布。溅射条件如下所述,并将测定区域设为自镀覆层表面起直至深度50μm为止。
(溅射条件)
脉冲溅射频率:50Hz
阳极直径(分析面积):直径6mm
放电功率:30W
Ar气压:2.5hPa
将分析结果表示于图2中。如图2所示,将从镀覆层表面起Zn量与Fe量相等的位置设为镀覆层与基底钢板之间的界面。另外,将自镀覆层表面起深度40μm至50μm的各测定位置处的O量的平均值设为试片内部的O量平均值,并将比其高0.02%的范围、即O量≥(试片内部的O量平均值+0.02%)定义为内部氧化层,将其最大深度设为内部氧化层深度。利用3个试片实施了同样的试验,将其平均设为内部氧化层的平均深度d。
(2)酸洗、冷轧后的内部氧化层深度的测定(参考)
除了使用酸洗、冷轧后的基底钢板这一点以外,通过与所述(1)同样的方式计算了内部氧化层的平均深度。
(3)软质层的平均深度D的测定
使垂直于镀覆钢板的板宽W方向的截面即W/4部位露出,采集尺寸为20mm×20mm的试片后,将其埋入树脂中,并从镀覆层与基底钢板之间的界面起,朝向基底钢板的板厚t内部测定了维氏硬度。利用维氏硬度计,在负载为3gf下进行了测定。详细而言,如图3所示,自镀覆层与基底钢板的界面起的板厚内部深度为10μm的测定位置开始,朝向板厚内部每隔5μm的间距进行了维氏硬度的测定,直至深度100μm的位置。测定点之间的间隔、即在图3中的×与×之间的距离最小也有15μm以上。在各深度位置以n=1的个数测定了维氏硬度,调查了板厚内部方向的硬度分布。进一步,利用维氏硬度计,在负载为1kgf下测定了基底钢板的t/4部位的维氏硬度(n=1)。将与基底钢板的t/4部位的维氏硬度相比维氏硬度为90%以下的区域设为软质层,并计算了其深度。在同一试片中的10个部位实施了同样的试验,将其平均设为软质层的平均深度D。
(4)镀覆钢板的组织分率的测定方法
使镀覆钢板的垂直于板宽W方向的截面W/4部位露出,并对该截面进行抛光,进而进行电解抛光后,进行硝酸乙醇腐蚀,用SEM(Scanning Electron Microscope)进行了观察。观察位置是将基底钢板的板厚设为t时的t/4位置,观察倍率为2000倍,观察区域为40μm×40μm。对用SEM拍摄的金属组织相片进行了图像分析,分别测定了马氏体和贝氏体(不区分两者)以及铁素体的面积率。表3中,α=铁素体,(B+M)=(贝氏体及马氏体)。此外,表3中,“其它”的组织的面积分率是从100面积%减去马氏体和贝氏体以及铁素体的各面积率而计算出的。任意地以3个视野进行观察并计算出了平均值。
(5)镀覆钢板的旧奥氏体的平均粒径的测定方法
使镀覆钢板的垂直于板宽W方向的截面W/4部位露出,并对该截面进行抛光,在苦味酸饱和水溶液和0.5%的烷基磺酸钠的混合液中浸蚀而使旧奥氏体晶粒边界出现。接着,通过JIS G 0551的切断法求出了t/4部位的组织的平均粒度号G。详细而言,以所述t/4部位的组织的1个视野试验线至少与50个晶粒交叉的方式决定光学显微镜的倍率,以任意选择的至少5个视野,并使用与试验线交叉的至少250个晶粒数求出了平均粒度号G。根据该平均粒度号G计算出每1mm2的截面积的平均晶粒数m,并基于的式求出了旧奥氏体的平均粒径d(mm)。表3中“-”是由于贝氏体和马氏体的合计面积率小而未能观察到旧奥氏体的例子。
(6)拉伸试验的测定方法
以使垂直于镀覆钢板的轧制方向的方向和试片的长边方向相互平行的方式采集了JIS13号B拉伸试片,依照JIS Z2241测定了C方向的抗拉强度(TS)及降伏应力(YS)。根据TS及YS计算了降伏比YR(YS/TS)。
在本实施例中,将980MPa以上的抗拉强度TS评价为高强度(合格)。另外,将60%以上的YR评价为耐冲击吸收性优异(合格)。
(7)弯曲加工试验
准备了以使垂直于镀覆钢板的轧制方向的方向和试片的长边方向相互平行的方式从镀覆钢板切出的20mm×70mm的试片,以使弯曲棱线沿着长边方向的方式进行了90°V型弯曲试验。通过适宜地改变弯曲半径R来实施了试验,求出了可以在不让试片上产生断裂的状态下进行弯曲加工的最小弯曲半径Rmin。
基于Rmin除以基底钢板的板厚t而所得的Rmin/t,按各抗拉强度TS分别评价了弯曲性。详细内容如下所述。另外,对于TS不满足合格基准980MPa以上的试片,没有评价弯曲性(在表3中记为“-”)。
在TS为980MPa以上且小于1080MPa的情况下,将Rmin/t<1.0作为合格。
在TS为1080MPa以上且小于1180MPa的情况下,将Rmin/t<1.5作为合格。
在TS为1180MPa以上的情况下,将Rmin/t<2.50作为合格。
(8)耐延迟断裂特性试验
使垂直于镀覆钢板的板宽W方向的截面即W/4部位露出,切出了150mm(W)×30mm(L)的试片,以最小弯曲半径进行U型弯曲加工后,用螺钉紧固,对U型弯曲加工试片的外侧表面施加了1000MPa的拉伸应力。将应变计贴在U型弯曲加工试片的外侧,并将应变换算为拉伸应力来测定了拉伸应力。然后,遮蔽U型弯曲加工试片的边缘部,以电化学方式进行了充氢。充氢是将试片浸渍在0.1M-H2SO4(pH=3)与0.01M-KSCN的混合溶液中,在室温且100μA/mm2的恒流的条件下进行。
所述充氢试验的结果,将24小时未断裂的评价为合格,即耐延迟断裂特性优异。
(9)扩孔试验
依据日本钢铁联盟规格JFST1001实施扩孔试验,测定了λ。详细而言,在镀覆钢板上冲了直径为10mm的孔,然后,在固定周围的状态下将60°圆锥冲头压入孔中,测定了裂纹产生临界的孔的直径。根据下式求出了临界扩孔率λ(%),在λ为25%以上时评价为合格,即扩孔性优异。
临界扩孔率λ(%)={(Df-D0)/D0}×100
式中,Df是裂纹产生临界的孔的直径(mm),D0是初始孔直径(mm)。
(10)镀覆外观
通过肉眼观察了镀覆钢板的外观,基于有无发生未镀覆来评价了镀覆性。
将这些结果示于表2及表3中。
表1
表2
(*)以10℃/秒冷却至600℃后进行水冷
表3
可根据表如下地考察。
首先,No.1~11、18、20、23、24、26、30、31、33是满足本发明的要件的例子,强度、加工性[弯曲性及扩孔性(λ)]、耐延迟断裂特性、冲击特性、镀覆性均良好。特别是内部氧化层的平均深度d与软质层的平均深度D满足D>2d(即、表2中“D/2d”的值超过1)的关系的No.1(D/2d=1.09)与不满足所述关系的No.20(D/2d=0.91)相比,弯曲性提高。而且λ也增加。
相对于此,No.12是C量多的例子,弯曲性、λ以及耐延迟断裂特性降低。
No.13是Si量少的例子,内部氧化层未充分生成,弯曲性、λ及耐延迟断裂特性降低。
No.14是Mn量少的例子,由于淬火性差而铁素体过量生成,且(B+M)的合计量也变少。其结果,TS和YR降低,λ也降低。
No.15是均热后的平均冷却速度慢的例子,由于在冷却过程中铁素体过量生成,且(B+M)的合计量也变少,未能获得所期望的硬质层。其结果,TS和YR变低,λ降低。
No.22也是均热后的平均冷却速度慢的例子,由于在冷却过程中铁素体过量生成,因此,YR变低,λ、弯曲性、耐延迟断裂特性降低。
No.16及17是热轧时的卷取温度低的例子,酸洗、冷轧后的内部氧化层的平均深度浅,因此镀覆后的内部氧化层的平均深度d、软质层的平均深度D也变浅。其结果,弯曲性、耐延迟断裂特性及镀覆性降低。
No.19是氧化炉中的空气比低而铁氧化膜未充分生成,镀覆性降低。而且,软质层也未充分生成,因此,弯曲性、耐延迟断裂特性也降低。
No.21是均热温度低的例子,变为二相区退火,铁素体过量生成,(B+M)的合计量也变少,未能获得所期望的硬质层。因此,YR变低,λ、弯曲性、耐延迟断裂特性降低。
No.25是热轧时的卷取温度低的例子,酸洗、冷轧后的内部氧化层的平均深度浅,因此镀覆后的内部氧化层的平均深度d、软质层的平均深度D也变浅。其结果,弯曲性、耐延迟断裂特性及镀覆性降低。
No.27是保温时间不充分的例子,由于酸洗、冷轧后的内部氧化层的平均深度浅,因此镀覆后的内部氧化层的平均深度d、软质层的平均深度D也变浅。其结果,弯曲性、耐延迟断裂特性及镀覆性降低。
No.28是平均升温速度慢的例子,由于旧奥氏体的平均粒径变大,因此弯曲性、λ及耐延迟断裂特性降低。
No.29是平均升温速度慢的例子,由于旧奥氏体的平均粒径变大,因此弯曲性、λ及耐延迟断裂特性降低。
No.32是平均升温速度慢的例子,由于旧奥氏体的平均粒径变大,因此弯曲性、λ及耐延迟断裂特性降低。
符号说明
1 镀覆层
2 基底钢板
3 内部氧化层
4 软质层
5 硬质层
Claims (6)
1.一种高强度镀覆钢板,在基底钢板的表面具有热浸镀锌层或合金化热浸镀锌层,其特征在于,
(1)所述基底钢板以质量%计含有C:0.05%至0.25%、Si:0.5%至2.5%、Mn:2.0%至4%、P:超过0%且0.1%以下、S:超过0%且0.05%以下、Al:0.01%至0.1%、N:超过0%且0.01%以下,余量是铁和不可避免的杂质,
(2)自所述基底钢板与所述镀覆层之间的界面起,向基底钢板侧依次包含:
内部氧化层,包含选自由Si和Mn构成的组中的至少一种的氧化物;
软质层,包含所述内部氧化层,并且,在将所述基底钢板的板厚设为t时,具有所述基底钢板的t/4部位的维氏硬度的90%以下的维氏硬度;以及
硬质层,包括以马氏体和贝氏体为主体的组织,并且,旧奥氏体的平均粒径为20μm以下,其中,
所述软质层的平均深度D为20μm以上,
所述内部氧化层的平均深度d为4μm以上且小于所述D,
所述高强度镀覆钢板的抗拉强度为980MPa以上。
2.根据权利要求1所述的高强度镀覆钢板,其特征在于,所述基底钢板以质量%计还含有以下的(a)~(c)中的至少其中之一:
(a)从由Cr:超过0%且1%以下、Mo:超过0%且1%以下和B:超过0%且0.01%以下所构成的组中选择的至少一种;
(b)从由Ti:超过0%且0.2%以下、Nb:超过0%且0.2%以下和V:超过0%且0.2%以下所构成的组中选择的至少一种;
(c)从由Cu:超过0%且1%以下和Ni:超过0%且1%以下所构成的组中选择的至少一种。
3.根据权利要求1所述的高强度镀覆钢板,其特征在于,
所述内部氧化层的平均深度d与所述软质层的平均深度D满足D>2d的关系。
4.根据权利要求2所述的高强度镀覆钢板,其特征在于,
所述内部氧化层的平均深度d与所述软质层的平均深度D满足D>2d的关系。
5.一种高强度镀覆钢板的制造方法,其特征在于,用于制造权利要求1至4中任一项所述的高强度镀覆钢板,所述制造方法依次包括:
在600℃以上的温度下将满足所述基底钢板的钢成分的钢板卷取的热轧步骤;
以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;
在氧化带中,以0.9至1.4的空气比进行氧化的步骤;
在还原带中,在Ac3点至Ac3点+100℃的范围进行均热的步骤;以及
均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,
从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。
6.一种高强度镀覆钢板的制造方法,其特征在于,用于制造权利要求1至4中任一项所述的高强度镀覆钢板,所述制造方法依次包括:
在500℃以上的温度下将满足所述基底钢板的钢成分的钢板卷取的热轧步骤;
在500℃以上的温度下保温80分钟以上的步骤;
以使内部氧化层的平均深度d保留4μm以上的方式进行酸洗和冷轧的步骤;
在氧化带中,以0.9至1.4的空气比进行氧化的步骤;
在还原带中,在Ac3点至Ac3点+100℃的范围进行均热的步骤;以及
均热后,将冷却停止温度为止的范围以5℃/秒以上的平均冷却速度进行冷却的步骤,其中,
从500℃起至Ac3点为止以3℃/秒以上的平均速度升温。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015003469A JP6010144B2 (ja) | 2015-01-09 | 2015-01-09 | めっき性、加工性、および耐遅れ破壊特性に優れた高強度めっき鋼板、並びにその製造方法 |
JP2015-003469 | 2015-01-09 | ||
PCT/JP2016/050066 WO2016111271A1 (ja) | 2015-01-09 | 2016-01-05 | めっき性、加工性、および耐遅れ破壊特性に優れた高強度めっき鋼板、並びにその製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN107109575A true CN107109575A (zh) | 2017-08-29 |
CN107109575B CN107109575B (zh) | 2019-01-18 |
Family
ID=56355959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201680005032.8A Active CN107109575B (zh) | 2015-01-09 | 2016-01-05 | 镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US10604829B2 (zh) |
JP (1) | JP6010144B2 (zh) |
KR (1) | KR101843703B1 (zh) |
CN (1) | CN107109575B (zh) |
MX (1) | MX2017009015A (zh) |
WO (1) | WO2016111271A1 (zh) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI656037B (zh) * | 2017-02-20 | 2019-04-11 | 日商新日鐵住金股份有限公司 | High strength steel plate |
CN111971408A (zh) * | 2018-03-30 | 2020-11-20 | 日本制铁株式会社 | 钢板及其制造方法 |
CN114990445A (zh) * | 2022-06-20 | 2022-09-02 | 武汉钢铁有限公司 | 一种采用短流程生产的550MPa级高耐蚀涂镀薄钢板及方法 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3489382B1 (en) * | 2016-09-28 | 2020-05-13 | JFE Steel Corporation | Steel sheet and method for producing same |
JP6443593B1 (ja) | 2017-02-20 | 2018-12-26 | 新日鐵住金株式会社 | 高強度鋼板 |
CN110199045B (zh) * | 2017-04-28 | 2021-12-24 | 日本制铁株式会社 | 高强度钢板及其制造方法 |
KR102266855B1 (ko) * | 2017-12-18 | 2021-06-18 | 주식회사 포스코 | 용접성이 우수한 고강도 냉연강판 및 도금강판과 그 제조 방법 |
EP3715493A4 (en) * | 2017-12-27 | 2020-11-25 | JFE Steel Corporation | HIGH STRENGTH STEEL SHEET AND METHOD OF MANUFACTURING ITEM |
TW201945559A (zh) * | 2018-05-01 | 2019-12-01 | 日商日本製鐵股份有限公司 | 鋅系鍍敷鋼板及其製造方法 |
US11939642B2 (en) | 2018-10-10 | 2024-03-26 | Jfe Steel Corporation | High-strength steel sheet and method for manufacturing same |
MX2022015468A (es) * | 2020-06-08 | 2023-01-16 | Nippon Steel Corp | Lamina de acero y metodo para producir la misma. |
CN111549287B (zh) * | 2020-06-28 | 2021-08-03 | 宝钢特钢韶关有限公司 | 中碳钢及其生产工艺 |
KR102502605B1 (ko) * | 2020-12-18 | 2023-02-24 | 주식회사 포스코 | 표면품질과 전기저항 점용접성이 우수한 고강도 용융아연도금 강판 및 그 제조방법 |
WO2022153927A1 (ja) * | 2021-01-15 | 2022-07-21 | 日本製鉄株式会社 | 熱延鋼板 |
MX2023012626A (es) * | 2021-04-27 | 2023-11-09 | Nippon Steel Corp | Lamina de acero y lamina de acero enchapada. |
CN117677726A (zh) | 2021-08-02 | 2024-03-08 | 日本制铁株式会社 | 高强度钢板 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103114257A (zh) * | 2013-02-25 | 2013-05-22 | 武汉钢铁(集团)公司 | 具有稳定氧化层免酸洗高强大梁用钢及其制造方法 |
CN103842542A (zh) * | 2011-09-30 | 2014-06-04 | 新日铁住金株式会社 | 耐冲击特性优良的高强度热浸镀锌钢板及其制造方法、和高强度合金化热浸镀锌钢板及其制造方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4781836B2 (ja) * | 2006-02-08 | 2011-09-28 | 新日本製鐵株式会社 | 耐水素脆性に優れた超高強度鋼板とその製造方法及び超高強度溶融亜鉛めっき鋼板の製造方法並びに超高強度合金化溶融亜鉛めっき鋼板の製造方法 |
JP5194878B2 (ja) * | 2007-04-13 | 2013-05-08 | Jfeスチール株式会社 | 加工性および溶接性に優れる高強度溶融亜鉛めっき鋼板およびその製造方法 |
ES2730891T3 (es) | 2009-08-31 | 2019-11-13 | Nippon Steel Corp | Lámina de acero recocido y galvanizado de alta resistencia |
JP5636727B2 (ja) * | 2010-04-27 | 2014-12-10 | 新日鐵住金株式会社 | 溶融亜鉛めっき鋼板およびその製造方法 |
CN103717773B (zh) * | 2011-07-29 | 2016-05-04 | 新日铁住金株式会社 | 弯曲性优异的高强度镀锌钢板及其制造方法 |
JP6023612B2 (ja) * | 2012-04-20 | 2016-11-09 | 株式会社神戸製鋼所 | 化成処理性に優れた高強度冷延鋼板の製造方法 |
JP2015034334A (ja) * | 2013-07-12 | 2015-02-19 | 株式会社神戸製鋼所 | めっき性、加工性、および耐遅れ破壊特性に優れた高強度めっき鋼板、並びにその製造方法 |
JP2015193907A (ja) * | 2014-03-28 | 2015-11-05 | 株式会社神戸製鋼所 | 加工性、および耐遅れ破壊特性に優れた高強度合金化溶融亜鉛めっき鋼板、並びにその製造方法 |
-
2015
- 2015-01-09 JP JP2015003469A patent/JP6010144B2/ja not_active Expired - Fee Related
-
2016
- 2016-01-05 WO PCT/JP2016/050066 patent/WO2016111271A1/ja active Application Filing
- 2016-01-05 MX MX2017009015A patent/MX2017009015A/es active IP Right Grant
- 2016-01-05 CN CN201680005032.8A patent/CN107109575B/zh active Active
- 2016-01-05 KR KR1020177022026A patent/KR101843703B1/ko active IP Right Grant
- 2016-01-05 US US15/541,901 patent/US10604829B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103842542A (zh) * | 2011-09-30 | 2014-06-04 | 新日铁住金株式会社 | 耐冲击特性优良的高强度热浸镀锌钢板及其制造方法、和高强度合金化热浸镀锌钢板及其制造方法 |
CN103114257A (zh) * | 2013-02-25 | 2013-05-22 | 武汉钢铁(集团)公司 | 具有稳定氧化层免酸洗高强大梁用钢及其制造方法 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI656037B (zh) * | 2017-02-20 | 2019-04-11 | 日商新日鐵住金股份有限公司 | High strength steel plate |
CN111971408A (zh) * | 2018-03-30 | 2020-11-20 | 日本制铁株式会社 | 钢板及其制造方法 |
CN111971408B (zh) * | 2018-03-30 | 2021-10-29 | 日本制铁株式会社 | 钢板及其制造方法 |
CN114990445A (zh) * | 2022-06-20 | 2022-09-02 | 武汉钢铁有限公司 | 一种采用短流程生产的550MPa级高耐蚀涂镀薄钢板及方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20170096205A (ko) | 2017-08-23 |
JP6010144B2 (ja) | 2016-10-19 |
CN107109575B (zh) | 2019-01-18 |
WO2016111271A1 (ja) | 2016-07-14 |
US10604829B2 (en) | 2020-03-31 |
KR101843703B1 (ko) | 2018-03-29 |
JP2016128598A (ja) | 2016-07-14 |
US20180010227A1 (en) | 2018-01-11 |
MX2017009015A (es) | 2018-03-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105324506B (zh) | 镀覆性、加工性及耐延迟断裂特性优异的高强度镀覆钢板、以及其制造方法 | |
CN107109575B (zh) | 镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 | |
CN106133164B (zh) | 加工性和耐延迟断裂特性优异的高强度合金化热浸镀锌钢板及其制造方法 | |
CN107109576B (zh) | 高强度镀覆钢板以及其制造方法 | |
JP6085347B2 (ja) | 高強度めっき鋼板、並びにその製造方法 | |
CN105518173B (zh) | 热冲压成型体以及其制造方法 | |
CN106103768B (zh) | 延性和弯曲性优异的高强度冷轧钢板和高强度热浸镀锌钢板、以及它们的制造方法 | |
CN107109574A (zh) | 镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 | |
KR101618477B1 (ko) | 고강도 강판 및 그 제조 방법 | |
CN101903556B (zh) | 高强度熔融镀锌钢板和高强度合金化熔融镀锌钢板的制造方法 | |
CN102884218B (zh) | 高强度钢板及其制造方法 | |
CN103987868B (zh) | 具有980MPa以上的最大拉伸强度、材质各向异性少且成形性优异的高强度热浸镀锌钢板、高强度合金化热浸镀锌钢板及它们的制造方法 | |
CN107109573A (zh) | 镀覆性、加工性及耐延迟断裂特性优异的高强度钢板及其制造方法 | |
CN106661654B (zh) | 制造高强度钢板的方法和通过该方法获得的板 | |
CN107429371A (zh) | 加工性和碰撞特性优异且抗拉强度为980MPa以上的高强度冷轧钢板及其制造方法 | |
CN109023051A (zh) | 热压用钢板、其制造方法以及热压钢板构件 | |
EP2757169A1 (en) | High-strength steel sheet having excellent workability and method for producing same | |
CN103857821A (zh) | 高强度热浸镀锌钢板 | |
CN102471849A (zh) | 高强度钢板及其制造方法 | |
KR20160121599A (ko) | 합금화 용융 아연 도금 열연 강판 및 그 제조 방법 | |
CN107148492A (zh) | 热浸镀锌钢板 | |
JP2018193614A (ja) | めっき性、加工性、および耐遅れ破壊特性に優れた高強度めっき鋼板、並びにその製造方法 | |
WO2016111272A1 (ja) | 高強度めっき鋼板、並びにその製造方法 | |
CN103732777B (zh) | 热镀锌钢板及其制造方法 | |
CN107849667A (zh) | 钢板、热浸镀锌钢板和合金化热浸镀锌钢板、以及它们的制造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |