CN118056030A - 经冷轧和热处理的钢板及其制造方法 - Google Patents
经冷轧和热处理的钢板及其制造方法 Download PDFInfo
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- CN118056030A CN118056030A CN202180103057.2A CN202180103057A CN118056030A CN 118056030 A CN118056030 A CN 118056030A CN 202180103057 A CN202180103057 A CN 202180103057A CN 118056030 A CN118056030 A CN 118056030A
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- steel sheet
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- temperature
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 30
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 22
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 19
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 10
- 230000000717 retained effect Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 19
- 238000000137 annealing Methods 0.000 claims description 17
- 239000010960 cold rolled steel Substances 0.000 claims description 15
- 239000011572 manganese Substances 0.000 claims description 15
- 229910052748 manganese Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 238000003303 reheating Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- 229910052796 boron Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 230000001627 detrimental effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000000979 retarding effect Effects 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction 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
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- B32B15/012—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 aluminium or an aluminium alloy
-
- 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
-
- 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
- C21D1/22—Martempering
-
- 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
- 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
- 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
- C22C38/02—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
- C22C38/06—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
- C22C38/12—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- 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)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
本发明涉及经冷轧和热处理的钢板,其以重量百分比计包含:0.2%≦C≦0.35%;0.5%≦Mn≦1.5%;0.1%≦Si≦0.6%;0%≦Al≦0.1%;0.01%≦Ti≦0.1%;0.0001%≦B≦0.010%;0%≦P≦0.02%;0%≦S≦0.03%;0%≦N≦0.09%,并且可以包含任选的元素,所述钢的显微组织按面积百分比计包含至少80%的回火马氏体、3%至15%的贝氏体、1%至7%的马氏体、0%至12%的铁素体和0%至2%的残余奥氏体。
Description
技术领域
本发明涉及适合用作车辆用钢板的冷轧钢板。
背景技术
汽车部件需要满足两个不一致的需求,即易于成形和强度,但近年来,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,以便符合在复杂的汽车组件中易于装配的标准,同时必须针对车辆耐撞性和耐久性而提高强度,同时减轻车辆重量以改善燃料效率,更进一步地,钢部件必须是可焊接的,同时不会遭受液态金属脆化。
因此,投入了大量的研究和开发努力,以通过提高材料的强度来减少汽车中使用的材料的量。相反,钢板强度的增加降低了可成形性,并因此需要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领域的早期研究和开发已经得到了数种用于生产高强度和高可成形性钢板的方法,本文中列举其中的一些以用于对本发明的明确理解:
EP3561119提供了具有低屈服比和优异的均匀延伸率的回火马氏体钢,所述回火马氏体钢按重量%计包含:0.2%至0.6%的C、0.01%至2.2%的Si、0.5%至3.0%的Mn、0.015%或更少的P、0.005%或更少的S、0.01%至0.1%的Al、0.01%至0.1%的Ti、0.05%至0.5%的Cr、0.0005%至0.005%的B、0.05%至0.5%的Mo、0.01%或更少的N、以及余量的Fe和不可避免的杂质;具有0.4至0.6的屈服比;具有10,000MPa%或更大的抗拉强度和均匀延伸率的产物(TS*U-El);并且具有按面积分数计包含90%或更多的回火马氏体、5%或更少的铁素体以及余量的贝氏体的显微组织。然而,YS/TS比并未实现。
与制造高强度和高成形性钢板相关的已知现有技术受到一个或另一个缺陷的影响:因此需要具有大于1440MPa的强度的冷轧钢板及其制造方法。
发明内容
本发明的目的是通过制造可获得的经冷轧和热处理的钢板来解决这些问题,所述经冷轧和热处理的钢板同时具有:
-大于或等于1440MPa、优选高于1470MPa的极限抗拉强度,
-大于或高于1120MPa、优选高于1130MPa的屈服强度。
在一个优选实施方案中,经冷轧和热处理的钢板显示出6.5%或更大的总延伸率。
在一个优选实施方案中,经冷轧和热处理的钢板显示出大于0.70的YS/TS比。
优选地,这样的钢还可以具有对于成形,特别是对于具有良好的可焊性和可涂覆性的轧制的良好适应性。
本发明的另一个目的还在于提供用于制造这些板的方法,所述方法与常规的工业应用兼容,同时对制造参数变化是稳健的。
本发明的经冷轧和热处理的钢板可以任选地涂覆有锌或锌合金或者铝或铝合金以改善其耐腐蚀性。
本发明的其他特征和优点将从本发明的以下详细描述中变得明显。
碳以0.2%至0.35%存在于钢中。碳是通过延缓退火之后的冷却期间铁素体和贝氏体的形成来提高钢板强度所必需的元素。小于0.2%的含量将不允许本发明的钢具有足够的抗拉强度以及延性。另一方面,在超过0.35%的碳含量下,焊接区和热影响区显著硬化,并因此焊接区的机械特性受到损害。碳的优选限度为0.22%至0.33%,并且更优选的限度为0.22%至0.3%。
本发明的钢的锰含量为0.5%至1.5%。锰是赋予强度的元素,并且至少0.5%的量的锰对于通过延缓铁素体的形成来提供钢板的强度和淬透性是必需的。因此,优选较高百分比的锰,例如0.55%至1.4%,并且更优选0.6%至1.3%。但是当锰多于1.5%时,这会产生不利影响,例如减慢在用于贝氏体转变的等温保持期间奥氏体向贝氏体的转变,从而导致延性降低。此外,当锰高于1.5%时,马氏体的形成超过目标限度,因此延伸率降低。此外,锰含量高于1.5%将会引起中心偏析,并且还降低本发明钢的可焊性。此外,就氢致延迟断裂(其是钢铁制造商和汽车工业的重要标准)而言,高锰含量是不利的。
本发明的钢的硅含量为0.1%至0.6%。硅是有助于通过固溶强化来提高强度的元素。硅是可以减缓退火之后的冷却期间碳化物析出的成分,因此硅促进马氏体的形成。但是硅也是铁素体形成剂,并且还提高Ac3转变点,这会将退火温度推至更高的温度范围,这是将硅的含量保持在最大0.6%的原因。高于0.6%的硅含量也可能回火脆化,此外硅还会损害可涂覆性。硅存在的优选限度为0.1%至0.5%,并且更优选为0.15%至0.4%。
本发明的钢的铝含量为0%至0.1%。在炼钢期间可以添加铝来对钢进行脱氧以捕获氧。高于0.1%将提高Ac3点,从而降低生产率。此外,在这样的范围内,铝结合钢中的氮以形成氮化铝,从而减小晶粒尺寸,并且铝还延缓渗碳体的析出,然而铝在本发明中,当铝含量超过0.1%时,氮化铝的量和尺寸对扩孔和弯曲不利,并且还将Ac3推至更高的温度范围(在工业上达到其是非常昂贵的),并且还导致退火均热期间的晶粒粗化。铝的优选限度为0%至0.06%,并且更优选为0%至0.05%。
钛是以0.01%至0.1%、优选0.01%至0.09%添加至本发明的钢中的元素。其适用于形成碳化物、氮化物和碳氮化物,以通过在退火均热温度范围期间的析出硬化来赋予根据本发明的钢强度,因此在完全退火之后更精细,这引起产品的硬化。然而,当钛含量高于0.1%时,钛通过形成大量析出物来消耗碳,这对于本发明是不利的,因为大量析出物倾向于降低钢的延性。
硼是可以以0.0001%至0.010%、优选0.001%至0.004%添加从而使钢硬化的必需元素。硼捕获氮化物以形成氮化硼,这赋予本发明的钢强度。硼还赋予本发明的钢淬透性。然而,当添加多于0.010%的硼时,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,这对可成形性是不利的。
本发明的钢的磷含量被限制为0.02%。磷是在固溶体中硬化的元素。因此,至少0.002%的少量磷可以是有利的,但是磷也具有其不利影响,例如降低可点焊性和热延性,特别是由于其在晶界处偏析或与锰共偏析的趋势。出于这些原因,优选将其含量限制为最大0.015%。
硫不是必需元素,但可以作为杂质包含在钢中。从制造成本的角度来看,硫含量优选尽可能低,但为0.03%或更低,并且优选至多0.005%。此外,如果钢中存在较高的硫,则其尤其与Mn和Ti结合而形成硫化物,这对本发明的钢的弯曲、扩孔和延伸率是不利的。
氮被限制为0.09%,以避免材料老化并使固化期间氮化物的析出(其对钢的机械特性是不利的)最小化。
钼是以0%至0.9%存在于本发明的钢中的任选元素;当以至少0.01%的量添加时,钼在改善淬透性和硬度方面发挥有效作用,延缓退火之后的冷却期间铁素体和贝氏体的形成。Mo还有益于热轧产品的韧性,从而使其更容易制造。然而,钼的过度添加增加了合金元素的添加成本,因此出于经济原因,将其含量限制为0.9%。钼的优选限度为0%至0.7%,并且更优选为0%至0.6%。
铬是本发明的钢的任选元素,为0%至0.6%。铬为钢提供强度和硬化,但当以高于0.5%使用时,损害钢的表面光洁度。铬的优选限度为0.01%至0.5%,并且更优选为0.01%至0.4%。
铌是任选元素,并且可以以0%至0.09%、优选0.001%至0.08%、更优选0.01%至0.07%存在。其适用于形成碳氮化物以通过在退火均热温度范围期间的析出硬化来赋予根据本发明的钢强度,因此在完全退火之后更精细,这引起产品的硬化。然而,当铌含量高于0.09%时,铌通过形成大量碳氮化物来消耗碳,这对于本发明是不利的,因为大量碳氮化物倾向于降低钢的延性。
钒是可以以0%至0.1%、优选0.001%至0.1%添加至本发明的钢中的任选元素。与铌一样,其参与碳氮化物,因此在硬化中发挥作用。但是其也参与形成在铸造产品的固化期间出现的VN。因此将V的量限制为0.1%,以避免粗VN对扩孔不利。在钒含量低于0.001%的情况下,其不对本发明的钢产生任何影响。
铜可以作为任选元素以0%至2%的量添加,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%来获得这样的效果。然而,当其含量高于2%时,其可能使表面外观劣化。
镍可以作为任选元素以0%至2%的量添加,以提高本发明的钢的强度并改善其韧性。优选最少0.01%来获得这样的效果。然而,当其含量高于2%时,镍导致延性劣化。
钙是可以以0%至0.005%、优选0.001%至0.005%添加至本发明的钢中的任选元素。钙作为任选元素添加至本发明的钢中,尤其是在夹杂物处理期间。钙通过在对钢进行球化处理中捕获有害硫含量而有助于钢的精炼。
其他元素例如铈、镁或锆可以按以下比例单独或组合添加:Ce≤0.1%,Mg≤0.05%以及Zr≤0.05%。最高至所示的最大含量水平,这些元素使得可以在固化期间细化夹杂物晶粒。
钢组成的剩余部分由铁和加工所引起的不可避免的杂质组成。
根据本发明的钢板的显微组织按面积百分比计包含至少80%的回火马氏体、3%至15%的贝氏体、1%至7%的马氏体、0%至12%的铁素体和0%至2%的残余奥氏体。
显微组织中的相的表面分数通过以下方法确定:从钢板上切割试样,抛光并用本身已知的试剂蚀刻,以露出显微组织。之后通过扫描电子显微镜例如用具有场发射枪的扫描电子显微镜(“FEG-SEM”)以二次电子模式在大于5000×的放大倍率下检查断面。
铁素体分数的确定在硝酸酒精溶液(Nital)或苦醇/硝酸酒精溶液(Picral/Nital)试剂蚀刻之后借助于SEM观察来进行。残余奥氏体的确定通过XRD来进行,而对于配分马氏体,根据S.M.C.Van Bohemen和J.Sietsma在Metallurgical and materialstransactions第40A卷,2009年5月-1059的出版物来进行膨胀测定法研究。
回火马氏体按面积分数计占显微组织的至少80%。回火马氏体由马氏体形成,所述马氏体在退火之后的冷却期间形成,特别地在低于Ms温度并且更特别地低于Ms-10℃之后形成。然后这样的马氏体在200℃至Ms-10℃的回火温度T回火下保持期间回火。本发明的回火马氏体赋予这样的钢延性和强度。优选地,马氏体的含量为80%至95%,并且更优选为80%至90%。
贝氏体以3%至15%的量包含在内,在本发明的框架中,贝氏体可以包含不含碳化物的贝氏体和/或板条贝氏体和粒状贝氏体。当存在时,板条贝氏体呈厚度为1微米至5微米的板条形式。当存在时,不含碳化物的贝氏体为具有非常低的碳化物密度的贝氏体,每100μm2面积单位低于100个碳化物,并且可能包含奥氏体岛。当存在时,粒状贝氏体呈晶粒形式,其中碳化物存在于晶粒内部。贝氏体提供了改善的延伸率。贝氏体的存在优选为3%至12%,并且更优选为3%至11%。
对于本发明的钢来说,铁素体按面积分数计占显微组织的0%至12%。铁素体赋予本发明的钢强度和延伸率。本发明钢的铁素体可以包含多边形铁素体、板条铁素体、针状铁素体、板状铁素体或外延铁素体。本发明的铁素体在退火之后的冷却完成期间形成。但是,每当铁素体含量以高于10%存在于本发明的钢中时,由于以下事实而不可能同时具有屈服强度和总延伸率二者:铁素体增加与硬相(例如回火马氏体、马氏体和贝氏体)的硬度差距并降低局部延性,从而导致总延伸率和屈服强度劣化。对于本发明来说,铁素体存在的优选限度为0%至11%,并且更优选为0%至10%。
马氏体按面积分数计占显微组织的1%至7%。本发明由于冷轧钢板过时效保持之后的冷却而形成新鲜马氏体。马氏体赋予本发明的钢延性和强度。然而,当新鲜马氏体以高于10%存在时,由于新鲜马氏体具有与残余奥氏体相同量的碳含量,因而新鲜马氏体是脆而硬的原因,其赋予过剩的强度,但降低延伸率而超出本发明钢的可接受的限度。本发明的钢的马氏体的优选限度为1%至6%,并且更优选为1%至5%。
残余奥氏体是任选的显微组织,其可以以0%至2%存在于钢中。
根据本发明的冷轧钢和热处理板可以通过任何合适的方法生产。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。铸件可以制成铸锭或者连续地制成呈薄板坯或薄带的形式,即具有范围为约220mm(对于板坯)直至几十毫米(对于薄带)的厚度。
例如,板坯将被视为半成品。具有上述化学组成的板坯通过连铸而制造,其中板坯优选在铸造期间经历直接轻压下以确保消除中心偏析和孔隙率减少。由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,然后再加热用于热轧。
经受热轧的板坯的温度优选为至少1000℃,优选高于1150℃,并且必须低于1300℃。在板坯的温度低于1150℃的情况下,对轧机施加了过度的负荷,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。此外,温度必须不高于1300℃,因为在工业上是昂贵的。
板坯的温度足够高,使得热轧可以完全在奥氏体范围内完成,精热轧温度保持高于850℃。最终轧制必须在高于850℃下进行,因为低于该温度,钢板表现出可轧制性的显著下降。
然后以至少5℃/秒的冷却速率将以该方式获得的板冷却至低于或等于680℃的温度。优选地,冷却速率将小于或等于100℃/秒且高于10℃/秒。此后,将热轧钢板在低于680℃并且优选为500℃至680℃、更优选为520℃至670℃的卷取温度下卷取。此后,使经卷取的热轧钢板冷却,优选冷却至室温。然后可以使热轧板经受任选的氧化皮去除过程例如酸洗,以除去热轧期间形成的氧化皮,并确保在使热轧钢板经受任选的热带退火之前其表面上没有氧化皮。
可以使热轧板经受任选的在350℃至750℃的温度下的热带退火1小时至96小时。选择这样的热带退火的温度和时间以确保热轧板的软化,从而有利于热轧板的冷轧。然后可以使热轧板经受任选的氧化皮去除过程例如酸洗,以除去在热带退火期间形成的氧化皮。
然后将热轧钢板冷却至室温,此后,然后将热轧板以35%至90%的厚度压下率冷轧以获得冷轧钢板。
然后使冷轧钢板经受退火,以赋予本发明的钢目标显微组织和机械特性。
在退火时,使冷轧钢板经受加热,其中以1℃/秒至30℃/秒的加热速率HR1将冷轧钢板从室温加热至达到Ac3+10℃至Ac3+150℃的均热温度TA。优选具有1℃/秒至20℃/秒,并且更优选1℃/秒至10℃/秒的HR1速率。优选的TA温度为800℃至900℃。
然后将冷轧钢板在退火均热温度TA下保持100秒至1000秒,以确保充分转变以在均热结束时形成100%的奥氏体。然后以5℃/秒至200℃/秒、优选8℃/秒至100℃/秒并且更优选10℃/秒至70℃/秒的平均冷却速率CR1将冷轧钢板冷却至Ms至Ms-150℃、优选200℃至350℃、更优选220℃至330℃的冷却停止温度范围CS1。将钢在CS1温度下保持1秒至500秒的时间。在该冷却步骤期间,形成本发明的马氏体。如果CS1温度高于Ms-40℃,则本发明的钢具有太多的奥氏体,这对总延伸率是不利的,而如果CS1低于Ms-150℃,则新鲜马氏体的量太高,并且总延伸率目标无法实现。
然后以至少1℃/秒的冷却速率将冷轧钢板冷却至室温,以获得经冷轧和热处理的钢板。
然后,可以任选地通过任何已知方法对所获得的经冷轧和热处理的钢板进行涂覆。涂层可以由锌或基于锌的合金或者铝或基于的铝合金制成。
在涂覆产品之后,可以进行任选的后分批退火,优选在170℃至210℃下进行12小时至30小时,以确保经涂覆产品的脱气。然后冷却至室温以获得经冷轧和涂覆的钢板。
实施例
本文提供的以下测试和实施例本质上是非限制性的,并且必须被视为仅用于举例说明的目的,并且将显示本发明的有利特征,并阐述发明人在大量实验之后选择的参数的重要性,并进一步确定根据本发明的钢可以实现的特性。
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一些比较等级的钢板样品。这些钢板的相应显微组织汇总在表3中,以及特性汇总在表4中。
表1描述了具有以重量百分比表示的组成的钢,并且还示出了每种钢的Ac3和Ms,并且Ac3和Ms温度由Andrews发表在Journal of the Iron and Steel Institute,203,721-727,1965中的公式计算:
Ac3(℃)=910-203x(%C)^(1/2)-15,2x(%Ni)+44,7x(%Si)+104x(%V)+31,5x
(%Mo)+13,1x(%W)-30x(%Mn)-11x(%Cr)-20x(%Cu)+700x(%P)+400x(%A1)+
120x(%As)+400x(%Ti).
Ms(℃)=539-423x(%C)-30.4x(%Mn)-12.1x(%Cr)-17.7x(%Ni)-7.5x(%Mo)
表1:试验的组成
试验 | C | Mn | Si | Al | Ti | B | P | S | N | Ni | Mo | Nb | Cr | Ms(℃) | Ac3(℃) |
1 | 0.23 | 1.2 | 0.24 | 0.048 | 0.031 | 0.0031 | 0.015 | 0.0015 | 0.0038 | 0 | 0.002 | 0 | 0.19 | 380 | 810 |
2 | 0.33 | 0.64 | 0.49 | 0.027 | 0.022 | 0.0024 | 0.0049 | 0.0017 | 0.0025 | 0.41 | 0.187 | 0.047 | 0.33 | 350 | 832 |
3 | 0.28 | 0.78 | 0.21 | 0.033 | 0.015 | 0.0013 | 0.011 | 0.005 | 0.003 | 0 | 0.40 | 0.029 | 0 | 380 | 820 |
4 | 0.21 | 1.82 | 0.25 | 0.025 | 0.029 | 0.0040 | 0.014 | 0.0011 | 0.0028 | 0 | 0 | 0 | 0.18 | 390 | 810 |
带下划线的值:未根据本发明
表2汇总了对表1的钢实施的退火工艺参数。
此外,在对本发明钢以及参照钢进行退火处理之前,将样品加热至1150℃至1300℃的温度并热轧。以55%的冷轧压下率对所有试验进行冷轧。
表2:试验的工艺参数
I=根据本发明;R=参照;带下划线的值:未根据本发明。
表3汇总了根据标准在不同显微镜例如扫描电子显微镜上进行的用于确定本发明钢和参照试验二者的显微组织组成(以面积分数计)的测试结果。
表3:
I=根据本发明;R=参照;带下划线的值:未根据本发明。
从上表可以看出,根据本发明的试验全部满足显微组织目标,而参照例的情况并非如此。
表4汇总了本发明钢和参照钢二者的机械特性和表面特性。
表4:试验的机械特性
屈服强度YS、抗拉强度TS和总延伸率TE根据于2009年10月公布的ISO标准ISO6892-1来测量。
试验 | TS(MPa) | YS(MPa) | 总延伸率(%) | YS/TS |
I1 | 1492 | 1144 | 7.8 | 0.76 |
I2 | 1504 | 1136 | 7.8 | 0.75 |
I3 | 1523 | 1276 | 6.9 | 0.84 |
I4 | 1560 | 1168 | 7.5 | 0.75 |
I5 | 1491 | 1218 | 7.4 | 0.82 |
I6 | 1479 | 1297 | 6.5 | 0.87 |
R1 | 1513 | 1032 | 8.4 | 0.68 |
R2 | 1392 | 1130 | 6.4 | 0.81 |
I=根据本发明;R=参照;带下划线的值:未根据本发明。
从上表可以看出,根据本发明的试验全部满足目标特性,而参照例的情况并非如此。
Claims (14)
1.一种经冷轧和热处理的钢板,以重量百分比表示,包含以下元素:
0.2%≦C≦0.35%;
0.5%≦Mn≦1.5%;
0.1%≦Si≦0.6%;
0%≦Al≦0.1%;
0.01%≦Ti≦0.1%;
0.0001%≦B≦0.010%;
0%≦P≦0.02%;
0%≦S≦0.03%;
0%≦N≦0.09%;
并且能够包含以下任选的元素中的一者或更多者:
0%≦Cr≦0.6%;
0%≦Nb≦0.09%;
0%≦Mo≦0.9%;
0%≦V≦0.1%;
0%≦Ni≦2%;
0%≦Cu≦2%;
0%≦Ca≦0.005%;
0%≦Ce≦0.1%;
0%≦Mg≦0.05%;
0%≦Zr≦0.05%;
剩余部分组成由铁和加工所引起的不可避免的杂质构成,所述钢的显微组织按面积百分比计包含至少80%的回火马氏体、3%至15%的贝氏体、1%至7%的马氏体、0%至12%的铁素体和0%至2%的残余奥氏体。
2.根据权利要求1所述的经冷轧和热处理的钢板,其中所述组成包含0.22%至0.33%的碳。
3.根据权利要求1或2所述的经冷轧和热处理的钢板,其中所述组成包含0.55%至1.4%的锰。
4.根据权利要求1至权利要求3中任一项所述的经冷轧和热处理的钢板,其中所述组成包含0%至0.06%的铝。
5.根据权利要求1至4中任一项所述的经冷轧和热处理的钢板,其中所述组成包含0.1%至0.5%的硅。
6.根据权利要求1至5中任一项所述的经冷轧和热处理的钢板,其中所述马氏体为1%至6%。
7.根据权利要求1至7中任一项所述的经冷轧和热处理的钢板,其中所述回火马氏体为80%至95%。
8.根据权利要求1至8中任一项所述的经冷轧和热处理的钢板,其中所述钢板具有1440MPa或更高的极限抗拉强度和1120MPa或更高的屈服强度。
9.一种生产经冷轧和热处理的钢板的方法,包括以下顺序步骤:
-提供根据权利要求1至5中任一项的钢组成;
-将所述半成品再加热至1000℃至1300℃的温度;
-在奥氏体范围内对所述半成品进行轧制以获得热轧钢板,其中热轧终轧温度高于850℃;
-以至少5℃/秒的冷却速率将所述板冷却至小于或等于680℃的卷取温度;以及将所述热轧板卷取;
-将所述热轧板冷却至室温;
-任选地对所述热轧钢板进行氧化皮去除过程;
-任选地能够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;
-将所述热轧钢板以35%至90%的压下率冷轧以获得冷轧钢板;
-然后以1℃/秒至30℃/秒的加热速率HR1将所述冷轧钢板从室温开始加热到Ac3+10℃至Ac3+150℃的温度TA,将所述冷轧钢板在所述温度TA下保持100秒至1000秒;
-然后以5℃/秒至200℃/秒的冷却速率CR1将所述冷轧钢板从TA开始冷却到Ms至Ms-150℃的温度CS1;
-然后将所述冷轧钢板在CS1温度下保持1秒至500秒;
-然后以至少1℃/秒的冷却速率冷却至室温以获得经冷轧和热处理的钢板。
10.根据权利要求9所述的方法,其中所述卷取温度为680℃至500℃。
11.根据权利要求9至10中任一项所述的方法,其中CS1为200℃至350℃。
12.根据权利要求9至11中任一项所述的方法,其中HR1为1℃/秒至20℃/秒。
13.根据权利要求9至12中任一项所述的方法,其中TA为800℃至900℃。
14.能够根据权利要求1至8中任一项获得的钢板或根据权利要求9至13中任一项所述的方法制造的钢板用于制造车辆的结构部件的用途。
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