CN115698346A - 经热处理的冷轧钢板及其制造方法 - Google Patents
经热处理的冷轧钢板及其制造方法 Download PDFInfo
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- CN115698346A CN115698346A CN202180039907.7A CN202180039907A CN115698346A CN 115698346 A CN115698346 A CN 115698346A CN 202180039907 A CN202180039907 A CN 202180039907A CN 115698346 A CN115698346 A CN 115698346A
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- steel sheet
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- equal
- temperature
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- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 106
- 239000010959 steel Substances 0.000 claims abstract description 106
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 10
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 239000010955 niobium Substances 0.000 claims abstract description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010936 titanium Substances 0.000 claims abstract description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011651 chromium Substances 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 239000011733 molybdenum Substances 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 230000001186 cumulative effect Effects 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000011574 phosphorus Substances 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 239000011593 sulfur Substances 0.000 claims abstract description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011575 calcium Substances 0.000 claims abstract description 5
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims abstract description 4
- 230000000717 retained effect Effects 0.000 claims abstract description 4
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 239000010949 copper Substances 0.000 claims abstract description 3
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 3
- 239000011777 magnesium Substances 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 20
- 238000000137 annealing Methods 0.000 claims description 16
- 239000011572 manganese Substances 0.000 claims description 14
- 229910052748 manganese Inorganic materials 0.000 claims description 13
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 2
- 239000011265 semifinished product Substances 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 230000001627 detrimental effect Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007571 dilatometry Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- -1 niobium Chemical compound 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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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
- C22C38/18—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless 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
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- 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
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- 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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
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- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
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- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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Abstract
一种冷轧钢板,其组成包含:0.05%≤碳≤0.15%、1.8%≤锰≤2.7%、0.1%≤硅≤1%、0.01%≤铝≤0.8%、0.1%≤铬≤0.9%、0%≤磷≤0.09%、0.0001%≤钛≤0.1%、0.0005%≤硼≤0.003%、0.01%≤铌≤0.1%、0%≤硫≤0.09%、0%≤氮≤0.09%、0%≤钒≤0.2%、0%≤钼≤0.2%、0%≤镍≤2%、0%≤铜≤2%、0%≤钙≤0.005%、0%≤铈≤0.1%、0%≤镁≦0.05%、0%≤锆≦0.05%,剩余部分由铁和因加工产生的不可避免的杂质构成,所述钢板的显微组织以面积分数计包含:40%至60%的马氏体、15%至40%的临界区铁素体、10%至35%累积量的转变铁素体和贝氏体、以及0%至5%的残余奥氏体。
Description
本发明涉及具有高强度和高可成形性的冷轧钢板,所述冷轧钢板具有980MPa或更大的抗拉强度和大于14%的总延伸率,其适合用作车辆用钢板。
汽车部件需要满足两个不一致的需求,即,易于成形和高强度,但是近年来,考虑到全球环境问题,还给予汽车以改善燃料消耗的第三个要求。因此,现在汽车部件必须由具有高可成形性的材料制成,以便符合复杂汽车组件的易于装配的标准,并且同时必须针对车辆耐撞性和耐久性而提高强度,同时减轻车辆的重量以改善燃料效率。
因此,进行了大量的研究和开发努力以通过增加材料的强度来减少汽车中使用的材料的量。相反地,钢板强度的增加降低了可成形性,并且因此必须开发具有高强度和高可成形性二者的材料。
在高强度和高可成形性钢板的领域中的早期研究和开发已经产生了数种用于生产高强度和高可成形性钢板的方法,本文列举了其中的一些方法以用于对本发明的明确理解:
US 9074 272描述了具有以下化学组成的钢:0.1%至0.28%的C、1.0%至2.0%的Si、1.0%至3.0%的Mn、以及由铁和不可避免的杂质组成的剩余部分。显微组织包含5%至20%的残余奥氏体、40%至65%的贝氏体铁素体、30%至50%的多边形铁素体、以及少于5%的马氏体。US 9074 272涉及具有优异延伸率的冷轧钢板,但US 9074 272中描述的该发明未能实现作为在保持复杂汽车部件坚固性的同时减轻重量的要求的900MPa的强度。
与高强度和高可成形性钢板的制造有关的已知现有技术具有一个或另一个缺陷:因此需要具有高强度和高可成形性的冷轧钢板及其制造方法。
本发明的目的是通过使得可获得同时具有以下的冷轧钢板来解决这些问题:
-大于或等于950MPa,并且优选地高于980MPa或者甚至高于1000MPa的极限抗拉强度,
-大于或等于14%,并且优选地大于或等于15%的总延伸率。
在一个优选的实施方案中,根据本发明的钢板的屈服强度值可以大于或高于540MPa或者甚至更好地高于550MPa。
优选地,这样的钢还可以具有对于成形,特别是对于轧制的良好适应性以及良好的可焊性和可涂覆性。
本发明的另一个目的还为使得可获得用于制造这些板的方法,所述方法与常规的工业应用相容同时对于制造参数变化是稳健的。
本发明的其他特征和优点将根据本发明的以下详细描述而变得明显。
碳以0.05%至0.15%存在于钢中。碳是通过产生低温转变相例如马氏体来提高钢板的强度所必需的元素。此外,碳也在奥氏体稳定中起关键作用。少于0.05%的含量将无法确保马氏体的形成,从而使强度降低。另一方面,在碳含量超过0.15%时,焊接区和热影响区显著硬化,并因此损害焊接区的机械特性。因此,优选的限制为0.07%至0.12%,并且更优选为0.08%至0.11%。
本发明的钢的锰含量为1.8%至2.7%。锰是通过固溶强化为钢赋予强度的元素。需要至少约1.8重量%的量的锰以提供钢板的强度和淬透性以及形成铁素体。因此,优选较高百分比的锰例如1.9%至2.5%,并且更优选地2.1%至2.5%。但是当锰多于2.7%时,这产生诸如使在退火之后的冷却期间奥氏体的转变减缓,从而导致延性降低的不利影响。此外,高于2.7%的锰含量也会降低本发明的钢的可焊性。
本发明的钢的硅含量为0.1%至1%。硅通过固溶强化为本发明的钢赋予强度。硅促进铁素体转变。然而,添加多于1%的硅无法改善所提及的效果并且导致诸如热轧脆化的问题。因此,将浓度控制在1%的上限内。将硅存在的优选限制保持为0.2%至0.9%,并且更优选地保持为0.3%至0.7%。
本发明的钢的铝含量为0.01%至0.8%。在这样的范围内,铝与钢中的氮结合以形成氮化铝,从而使晶粒的尺寸减小。但是,在本发明中每当铝的含量超过0.8%时,其将提高Ac3点,从而降低生产率。因此,将铝的优选范围保持为0.01%至0.7%,并且更优选地保持为0.01%至0.6%。
在一个优选的实施方案中,硅和铝的累积量为至少0.6%,因为两种元素均为铁素体相产生元素,从而参与形成有利于延伸率和延性二者的铁素体。
本发明的钢的铬含量为0.1%至0.9%。铬是为钢提供强度和硬化的必需元素,但在使用时高于0.9%损害钢的表面光洁度。因此,为了最佳地实现铬的效果,优选限制为0.2%至0.8%,并且更优选为0.2%至0.7%。
钛是可以以0.0001%至0.1%,并且优选地0.01%至0.08%添加到本发明的钢中的必需元素。与铌类似,钛参与到碳氮化物中,因此在硬化方面起作用。但是其也参与形成在铸造产品的凝固期间出现的TiN。将Ti的量因此限制为0.1%以避免对扩孔有害的粗TiN。在钛含量低于0.0001%的情况下,其对本发明的钢不产生任何影响。
硼为本发明的必需元素并且以非常少的量添加,以及以0.0005%至0.003%添加。硼为本发明的钢赋予淬透性和强度。然而,当硼添加多于0.003%时,发现钢板的可轧制性显著降低。此外,可能在晶界处发生硼偏析,这对可成形性有害。
铌为可以以0.01%至0.1%,优选地0.01%至0.06%添加到钢中的必需元素。铌适合于通过析出硬化来形成碳氮化物以向根据本发明的钢赋予强度。由于铌使加热期间的再结晶延迟,因此在保持温度结束时以及因此在完全退火之后所形成的显微组织更细,这导致产品的硬化。但是,当铌含量高于0.1%时,碳氮化物的量不利于本发明,因为大量的碳氮化物倾向于使钢的延性降低。
钒为可以以至多0.2%,优选地0.001%至0.01%添加到本发明的钢中的任选的元素。与铌一样,钒参与到碳氮化物中,因此在硬化中起作用。但是钒也参与形成在铸造产品的凝固期间出现的VN。将V的量因此限制为0.2%,以避免对扩孔有害的粗VN。在钒含量低于0.001%的情况下,钒对本发明的钢不产生任何影响。
将本发明的钢的磷含量限制为0.09%。磷为在固溶体中硬化并且还干扰形成碳化物的元素。因此,至少0.002%的少量的磷可以是有利的,但是磷还具有其不利的影响,例如可点焊性和热延性的降低,特别是因为其在晶界处偏析或者与锰共偏析的趋势。出于这些原因,优选地将其含量限制为最大0.02%。
硫不是必需元素,而是可以作为杂质包含在钢中。硫含量优选尽可能低,但是从制造成本的观点来看,为0.09%或更少,并且优选地少于0.03%。此外,如果更高的硫存在于钢中,则其尤其地与Mn和Ti结合以形成硫化物,并且降低Mn和Ti对本发明的有益影响。
将氮限制为0.09%以避免材料的老化并且使对钢的机械特性有害的在凝固期间氮化铝的析出最小化。
钼为构成本发明的钢的0%至0.2%的任选的元素;当以至少0.01%的量添加时,钼改善淬透性和硬度,使贝氏体的出现延迟,因此促进马氏体的形成。钼还促进铁素体的形成。然而,过量地添加钼增加了添加合金元素的成本,因此出于经济原因,将其含量限制为0.2%。钼的优选限制为0.01%至0.2%。
镍可以以0%至2%的量作为任选的元素添加以提高本发明的钢的强度并改善其韧性。优选最少0.01%以得到这样的效果。然而,当其含量高于2%时,镍导致延性劣化。
铜可以以0%至2%的量作为任选的元素添加以提高本发明的钢的强度并改善其耐腐蚀性。优选最少0.01%以得到这样的效果。然而,当其含量高于2%时,其可能使表面外观劣化。
钙为可以以至多0.005%,优选地0.0001%至0.005%添加到本发明的钢中的任选的元素。钙作为任选的元素尤其是在夹杂物处理期间添加到本发明的钢中。钙通过捕获在对钢进行球化处理中的有害硫内容物而有助于钢的精炼。
其他元素例如铈、镁或锆可以以以下比例单独或组合添加:Ce≤0.1%、Mg≤0.05%和Zr≤0.05%。最高至所指示的最大含量水平,这些元素使得可以使凝固期间的晶粒细化。
钢的组成的剩余部分由铁和因加工产生的不可避免的杂质组成。
根据本发明的钢板的显微组织以面积分数计包含:40%至60%的马氏体、5%至40%的临界区铁素体、10%至35%累积量的转变铁素体和贝氏体、以及0%至5%的残余奥氏体。
马氏体以面积分数计构成显微组织的40%至60%。在退火之后的冷却期间并且特别地在超过Ms温度之后以及特别地在Ms-10℃与20℃之间,或者在过时效之后的冷却期间,明显形成马氏体。马氏体为本发明赋予强度。马氏体的优选限制为42%至58%,并且更优选为43%至56%。
临界区铁素体以面积分数计构成本发明的钢的显微组织的15%至40%。该临界区铁素体赋予本发明的钢以至少14%的总延伸率。临界区铁素体由在低于Ac3的温度下退火而产生。临界区铁素体不同于将在以下描述的在下文中被称为“转变铁素体”的可以在退火之后产生的铁素体。与转变铁素体相反,临界区铁素体是多边形的。此外,转变铁素体富含碳和锰,即具有高于临界区铁素体的碳含量和锰含量的碳含量和锰含量。临界区铁素体和转变铁素体因此可以通过在用2%硝酸乙醇腐蚀液溶液蚀刻剂蚀刻之后,用使用二次电子的SEM显微镜观察显微照片来区分。在这样的显微照片上,临界区铁素体以中灰色呈现,而转变铁素体由于其较高的碳含量和锰含量而以深灰色呈现。优选的是具有20%至40%,并且更优选25%至38%的临界区铁素体。
转变铁素体和贝氏体的总量以面积分数计构成本发明的钢的显微组织的10%至35%。本发明的转变铁素体构成退火之后的冷却期间形成的铁素体以及根据本发明的钢总是包含转变铁素体,即,转变铁素体的存在总是多于0%。转变铁素体为本发明的钢赋予高的强度以及延伸率。本发明的钢的转变铁素体与临界区铁素体相比富含碳和锰并且在钢中具有转变铁素体是强制性的。在过时效保持期间,尤其是400℃至480℃的过时效保持期间形成贝氏体。为了确保14%的延伸率,必须具有10%的转变铁素体和贝氏体。但是每当总量在本发明的钢中存在高于35%时,不可能同时具有抗拉强度和总延伸率二者。本发明的转变铁素体和贝氏体的优选限制为15%至30%。
残余奥氏体为任选的显微组织并且可以以0%至5%存在于钢中。
除了上述显微组织之外,在不损害钢板的机械特性的情况下,经冷轧和热处理的钢板的显微组织不含显微组织组分例如珠光体、回火马氏体和渗碳体。
根据本发明的钢板可以通过任何合适的方法来生产。优选的方法包括提供具有根据本发明的化学组成的钢的半成品铸件。所述铸件可以制作为铸锭或者连续地制作成薄板坯或薄带的形式,即,厚度范围为约220mm(对于板坯)直至数十毫米(对于薄带)。
例如,具有上述化学组成的板坯通过连铸来制造,其中板坯在连铸过程期间任选地经历直接轻压下以避免中心偏析并且确保局部碳与标称碳的比率保持低于1.10。通过连铸过程提供的板坯可以在连铸之后直接在高温下使用,或者可以首先冷却至室温然后再加热以进行热轧。
经受热轧的板坯的温度为至少1000℃,并且必须低于1280℃。在板坯的温度低于1000℃的情况下,对轧机施加过大的负荷,此外,在精轧期间钢的温度可能降低至铁素体转变温度,由此钢将在组织中包含转变铁素体的状态下被轧制。必须避免在高于1280℃的温度下再加热,因为这在工业上是昂贵的。因此,板坯的精轧温度高于Ac3,并且优选足够高使得热轧可以在Ac3+150℃至Ac3+250℃的温度范围内完成。
为了具有有利于再结晶和轧制的组织,Ac3至Ac3+200℃的终轧温度范围是必须的。优选的是终轧道次在高于850℃,并且最好至少950℃的温度下进行。
然后将以这种方式获得的热轧钢以至少30℃/秒的冷却速率冷却至卷取温度。优选地,冷却速率将小于或等于200℃/秒。
然后将热轧钢在475℃至650℃的温度下卷取以避免椭圆化,并且优选地在475℃至625℃的温度下卷取以避免氧化皮形成。这样的卷取温度的更优选范围为500℃至625℃。然后将卷取的热轧钢冷却至室温,然后使其经受任选的热带退火。
可以使热轧钢经受任选的氧化皮去除步骤以除去任选的热带退火之前的热轧期间形成的氧化皮。然后可以使热轧板在例如400℃至750℃的温度下经受任选的热带退火持续优选地至少12小时且不超过96小时,温度保持低于750℃以避免使热轧显微组织部分转变并因此失去显微组织均匀性。此后,该热轧钢的任选的氧化皮去除步骤可以通过例如对这样的钢板的酸洗来进行。
以35%至90%的厚度压下率使该热轧钢经受冷轧以获得冷轧钢板。然后使从冷轧过程获得的冷轧钢板经受退火以赋予本发明的钢以显微组织和机械特性。
为了对所述冷轧钢板进行退火,优选地以至少3℃/秒的加热速率将其加热至Ac1+60℃至Ac3的均热温度,然后在该温度下进行退火5秒至500秒的时间,优选50秒至250秒的时间。在一个优选的实施方案中,所述加热以至少10℃/秒,并且更优选地以至少15℃/秒进行。在该退火期间,形成临界区铁素体。
优选的退火均热温度为Ac1+70℃至Ac3,并且更优选为Ac1+80℃至Ac3-30℃。
在一个优选的实施方案中,均热的时间和温度被选择成确保在均热结束时钢板的显微组织包含至少50%的奥氏体,并且更优选地至少60%的奥氏体。
然后将冷轧钢板以两步冷却过程冷却,其中第一步从均热温度开始以至少3℃/秒,优选至少5℃/秒,并且更优选至少10℃/秒的冷却速率CR1到550℃至650℃的温度T1。在该步骤期间,形成转变铁素体。然后将冷轧钢在T1下保持1秒至20秒,并且优选2秒至15秒,并且更优选5秒至12秒的时间。
此后,第二步从以至少3℃/秒,优选至少5℃/秒,并且更优选至少7℃/秒的冷却速率CR2将冷轧钢板从T1进一步冷却到400℃至480℃的过时效温度T2开始。
然后在T2下进行过时效5秒至100秒的时间。在过时效期间,形成一些贝氏体。优选的过时效温度T2为420℃至475℃。过时效温度的优选时间在15秒至75秒,并且更优选20秒至75℃期间。
然后可以将冷轧钢板冷却至室温,或者可以根据涂覆的性质使冷轧钢板达到420℃至680℃的热浸镀浴温度以促进冷轧钢板的热浸镀。
在任一情况下,最终冷却至室温以至少5℃/秒,并且优选至少9℃/秒的冷却速率完成以确保在本发明的钢中形成新鲜马氏体。
冷轧钢板也可以通过任何已知的工业过程例如电镀锌、JVD、PVD等进行涂覆,这些过程可以不需要使钢板在涂覆之前达到上述温度范围。
实施例
本文中提供的以下测试和实施例本质上是非限制性的并且必须被认为仅出于说明的目的,并且将显示本发明的有利特征并阐述本发明人在大量实验之后选择的参数的重要性,并进一步确定了可以由根据本发明的钢实现的特性。
用表1中汇总的组成和表2中汇总的工艺参数制备根据本发明的钢板样品和根据一些比较品级的钢板样品。这些钢板的相应的显微组织汇总在表3中并且特性汇总在表4中。
表1:试验的组成
表1描绘了具有以重量百分比表示的组成的钢。
样品 | C | Mn | Si | Al | Cr | Ti | B | Nb | P | S | N | Mo | Ca | Ac1 | Ac3 |
A | 0.10 | 2.29 | 0.60 | 0.04 | 0.53 | 0.028 | 0.0016 | 0.017 | 0.012 | 0.004 | 0.0069 | 0.003 | 0.0002 | 728 | 865 |
B | 0.09 | 2.23 | 0.59 | 0.19 | 0.52 | 0.012 | 0.0017 | 0.016 | 0.003 | 0.004 | 0.0069 | 0.003 | 0.0002 | 718 | 863 |
C | 0.10 | 2.31 | 0.60 | 0.19 | 0.53 | 0.001 | 0.0016 | 0.015 | 0.012 | 0.004 | 0.0056 | 0.003 | 0.0002 | 728 | 883 |
D | 0.09 | 2.30 | 0.62 | 0.31 | 0.53 | 0.001 | 0.0018 | 0.012 | 0.014 | 0.004 | 0.0056 | 0.003 | 0.0002 | 730 | 904 |
表1还示出了由膨胀测定法计算的Ac1温度点和Ac3温度点。
表2:工艺参数
表2汇总了对表1的钢样品实施的退火工艺参数,将所述钢样品全部在1230℃下再加热,以875℃的精轧温度热轧,在550℃下卷取,并且以50%压下率冷轧,然后经历退火和包括过时效的两步冷却方案:
加下划线的值:没有根据本发明。
表3汇总了根据标准在不同的显微镜例如扫描电子显微镜上进行的用于确定本发明的钢试验和参照试验二者的显微组织组成的测试的结果。
表3:试验的显微组织
加下划线的值:没有根据本发明。
表4汇总了本发明的钢和参照钢二者的机械特性。抗拉强度、屈服强度和总延伸率测试根据JIS Z2241标准进行。
表4:试验的机械特性
加下划线的值:没有根据本发明。
实施例表明,根据本发明的钢板由于其特定的组成和显微组织而为仅有的显示出所有目标特性的钢板。
Claims (18)
1.一种冷轧钢板,以重量百分比表示,所述冷轧钢板的组成包含以下元素:
0.05%≤碳≤0.15%
1.8%≤锰≤2.7%
0.1%≤硅≤1%
0.01%≤铝≤0.8%
0.1%≤铬≤0.9%
0%≤磷≤0.09%
0.0001%≤钛≤0.1%
0.0005%≤硼≤0.003%
0.01%≤铌≤0.1%
0%≤硫≤0.09%
0%≤氮≤0.09%
以及能够包含以下任选的元素中的一者或更多者:
0%≤钒≤0.2%
0%≤钼≤0.2%
0%≤镍≤2%
0%≤铜≤2%
0%≤钙≤0.005%
0%≤铈≤0.1%
0%≤镁≦0.05%
0%≤锆≦0.05%
剩余部分由铁和因加工产生的不可避免的杂质构成,所述钢板的显微组织以面积分数计包含:40%至60%的马氏体、15%至40%的临界区铁素体、10%至35%累积量的转变铁素体和贝氏体、以及0%至5%的残余奥氏体。
2.根据权利要求1所述的冷轧涂覆钢板,其中所述组成包含0.2%至0.9%的硅。
3.根据权利要求1或2所述的冷轧涂覆钢板,其中所述组成包含0.07%至0.12%的碳。
4.根据权利要求1至3中任一项所述的冷轧涂覆钢板,其中所述组成包含0.01%至0.7%的铝。
5.根据权利要求1至4中任一项所述的冷轧涂覆钢板,其中所述组成包含1.9%至2.5%的锰。
6.根据权利要求1至5中任一项所述的冷轧涂覆钢板,其中所述组成包含0.2%至0.8%的铬。
7.根据权利要求1至6中任一项所述的冷轧涂覆钢板,其中硅和铝的累积量多于0.6%。
8.根据权利要求1至7所述的冷轧涂覆钢板,其中转变铁素体和贝氏体的累积量为15%至30%。
9.根据权利要求1至8中任一项所述的冷轧涂覆钢板,其中所述马氏体的量为42%至58%。
10.根据权利要求1至9中任一项所述的冷轧涂覆钢板,其中所述钢板具有950MPa或更大的极限抗拉强度和14%或更大的总延伸率。
11.根据权利要求10所述的冷轧涂覆钢板,其中所述钢板的屈服强度为540MPa或更大。
12.一种生产冷轧涂覆钢板的方法,包括以下顺序步骤:
-提供根据权利要求1至7中任一项中的钢组成;
-将所述半成品再加热到1000℃至1280℃的温度;
-对所述半成品进行轧制,其中热轧精轧温度应高于Ac3以获得热轧钢;
-将所述热轧钢以至少30℃/秒的冷却速率冷却至为475℃至650℃的卷取温度;以及将所述热轧钢卷取;
-将所述热轧钢冷却至室温;
-任选地对所述热轧钢板进行氧化皮去除过程;
-任选地对热轧钢板进行退火;
-任选地对所述热轧钢板进行氧化皮去除过程;
-以35%至90%的压下率对所述热轧钢板进行冷轧以获得冷轧钢板;
-将所述冷轧钢板从室温加热到Ac1+60℃至Ac3的均热温度,
-然后在均热温度下进行退火5秒至500秒的时间,
-然后将所述冷轧钢以两步冷却过程冷却,其中:
○第一步从所述均热温度开始以至少3℃/秒的冷却速率CR1冷却到550℃至650℃的温度T1,
○然后将所述冷轧钢在T1下保持1秒至20秒的时间,
○然后第二步从以至少3℃/秒的冷却速率CR2将所述冷轧钢板从T1进一步冷却到400℃至480℃的过时效温度T2开始,
-然后在T2下进行过时效5秒至100秒的时间,
-然后任选地使所述冷轧钢板达到420℃至680℃的温度范围以便于涂覆以及任选地对所述冷轧钢板进行涂覆,
-此后,以至少5℃/秒的冷却速率将所述冷轧钢板冷却至室温以获得冷轧涂覆钢板。
13.根据权利要求12所述的方法,其中所述卷取温度为475℃至625℃。
14.根据权利要求12或13中任一项所述的方法,其中所述均热温度被选择成确保在均热结束时存在至少50%的奥氏体。
15.根据权利要求12至14中任一项所述的方法,其中所述过时效温度为420℃至475℃。
16.根据权利要求12至15中任一项所述的方法,其中涂覆之后的冷却速率为至少9℃/秒。
17.根据权利要求1至11中任一项所述的钢板或者根据权利要求12至16所述的方法生产的钢板用于制造车辆的结构部件或***件的用途。
18.一种包括根据权利要求17获得的部件的车辆。
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