CN116917506A - 扁钢产品、其制造方法和这种扁钢产品的用途 - Google Patents
扁钢产品、其制造方法和这种扁钢产品的用途 Download PDFInfo
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- CN116917506A CN116917506A CN202280018709.7A CN202280018709A CN116917506A CN 116917506 A CN116917506 A CN 116917506A CN 202280018709 A CN202280018709 A CN 202280018709A CN 116917506 A CN116917506 A CN 116917506A
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- flat steel
- steel product
- temperature
- cooling
- cold rolled
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 165
- 239000010959 steel Substances 0.000 title claims abstract description 165
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 229910052796 boron Inorganic materials 0.000 claims abstract description 12
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011574 phosphorus Substances 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 62
- 238000000137 annealing Methods 0.000 claims description 34
- 239000010936 titanium Substances 0.000 claims description 23
- 229910052719 titanium Inorganic materials 0.000 claims description 15
- 239000011701 zinc Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 238000005097 cold rolling Methods 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000003618 dip coating Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000000161 steel melt Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims 1
- 239000000047 product Substances 0.000 description 112
- 230000000694 effects Effects 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000011572 manganese Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- 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
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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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0442—Flattening; Dressing; Flexing
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0463—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment following hot rolling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0473—Final recrystallisation annealing
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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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- 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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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
本发明涉及一种冷轧扁钢产品,其钢基材具有750‑940MPa的抗拉强度、高强度、改善的可焊性和优化的成型性能,并且同时可以低成本生产。为此,根据本发明的冷轧扁钢产品由以下钢材组成,其以质量%计算的组成为C:0.040‑0.100%,Mn:2.10‑2.50%,Si:0.10‑0.40%,Cr:0.30‑0.90%,Ti:0.020‑0.080%,B:0.0005‑0.0020%,N:0.003‑0.010%,Al:最高0.10%,Ca:最高0.005%,P:最高0.025%,S:最高0.010%,选择性一种或多种下列元素:Mo:最高0.20%,Nb:0.050%,Cu:最高0.10%,V:最高0.020%,Ni:最高0.10%,其余为铁和不可避免的杂质,其中杂质的总含量限制在最多0.5质量%,并且杂质包括磷(“P”)和硫(“S”)的含量,并具有双相组织结构,其由10‑40体积%的马氏体、30‑90体积%的铁素体,包括贝氏体铁素体、不超过5体积%的残余奥氏体组成,其余为生产过程中不可避免的其他组织结构成分。
Description
技术领域
本发明涉及一种冷轧扁钢产品、其生产方法以及根据本发明的扁钢产品的用途。
背景技术
这里的“扁钢产品”是指长度和宽度均明显大于厚度的轧制产品。这些产品尤其包括钢带、钢板和由其制成的裁剪件,如板坯等。
在本文中,除非另有明确说明,否则有关合金成分的数据均以质量%表示。
如果在文中提到的公式或条件中根据某些合金元素的含量计算或形成数值,除非另有说明,否则这些公式或条件中合金元素的含量均以质量%为单位给出。
尤其是在汽车车身制造领域,对高强度钢存在需求,同时这种钢还应具有良好的成型性。尤其是在制造形状复杂的部件时,对局部变形能力和边缘裂纹不敏感性的要求很高,这可以例如通过孔扩展试验中的良好数值来量化。
由EP 2 031 081 B1已知一种冷轧扁钢产品,其可热镀锌基防腐涂层,并且其组织结构中20-70%由马氏体组成、最多8%由残余奥氏体组成和剩余由铁素体和/或贝氏体组成。扁钢产品的抗拉强度至少为950MPa,并且由一种钢组成,该钢按重量%计由C:0.050-0.105%,Si:0.10-0.60%,Mn:2.10-2.80%,Cr:0.20-0.80%,Ti:0.02-0.10%,B:<0.0020%,Mo:<0.25%,Al:<0.10%,Cu:最高0.20%,Ni:最高0.10%,Ca:最高0.005%,P:最高0.2%,S:最高0.01%,N:最高0.012%,其余为铁和不可避免的杂质组成。
这类钢材的特点是屈服强度比低,这是由于组织结构成分的强度存在显著差异。
在实践中,上述类型的扁钢产品虽然强度特别高,但容易形成边缘裂纹,影响其加工性能。此外,对这类扁钢产品有着进一步改善焊接性能的要求。
发明内容
在此背景下,本发明的目的在于开发一种扁钢产品,这种扁钢产品的钢基材强度高、可焊性好、成型性能优化,而且生产成本低廉。
此外,还涉及制造这种扁钢产品的方法以及根据本发明的扁钢产品特别适用的用途。
为解决这一目的而提出的产品至少具有权利要求1所述的特征。
权利要求9中给出一种能以成本有效的方式制造根据本发明的产品的方法。在此,按照权利要求8所述的方式,可以为这种产品设置一种防腐涂层,尤其以锌(“Zn”)为基础的防腐蚀涂层。
不言而喻,本领域技术人员在实施根据本发明的方法及其变体和扩展可能性时,会补充在此未明确提及的工作步骤,这些步骤是其根据实践经验知道在实施此类方法时经常使用的。
因此,根据本发明的扁钢产品的钢基材由一种钢材制成,其质量%为单位的组成为C:0.040-0.100%,Mn:2.10-2.50%,Si:0.10-0.40%,Cr:0.30-0.90%,Ti:0.020-0.080%,B:0.0005-0.0020%,N:0.003-0.010%,Al:最高0.10%,Ca:最高0.005%,P:最高0.025%,S:最高0.010%,Mo:最高0.20%,Nb:最高0.050%,Cu:最高0.10%,V:最高0.020%,Ni:最高0.10%,其余为铁和不可避免的杂质。
根据本发明的扁钢产品的钢基材具有双相结构,其由10-40体积%的马氏体、30-90体积%的铁素体,包括贝氏体铁素体、不超过5%的残余奥氏体以及剩余由于生产工艺而不可避免的其他组织结构成分组成,其中只有当其余组织结构成分的含量总和小于100%时,才会出现所述其他组织结构成分。
根据本发明设定的单独合金成分的含量如下述进行确定,其中以下解释分别基于根据本发明的扁钢产品的钢基材组成,即使只提及根据本发明的扁钢产品:
根据本发明的扁钢产品含有0.040-0.100质量%的碳(“C”)。当碳含量低于0.040重量%时,强度会下降太多。本发明中规定的最高0.100重量%的含碳量是考虑到钢材良好的可焊性选择的。此外,碳含量超过0.100重量%会导致形成硬度更高的富碳马氏体相,从而显著增加马氏体和铁素体之间的硬度差。这将对根据本发明的扁钢产品的扩孔性能和可焊性产生负面影响。当C含量至少为0.05质量%并且最多为0.08质量%时,根据本发明扁钢产品中C的存在所带来的积极影响就会得到充分发挥。
硅(“Si”)在根据本发明的扁钢产品中的含量为0.10-0.40质量%,以便通过硅对铁素体的硬化作用来提高强度。硅含量的上限为0.40质量%,以避免晶界氧化,通过晶界氧化会对钢的可涂层性和表面特性产生负面影响。
锰(“Mn”)的含量为2.10-2.50质量%,能有效防止本发明扁钢产品在退火线冷却过程中形成珠光体。同时,根据本发明确定的锰含量可促进结构中马氏体的形成,从而显著提高强度。此外,根据本发明设置的锰含量可弥补因根据本发明将C含量设定为相对较低值而导致的强度损失。优选Mn含量至少为2.20质量%并且最高为2.40质量%。
最多为0.10质量%的铝(“Al”)的含量为钢生产中的脱氧所必需。
钙(“Ca”)也可以以最多0.005质量%的含量添加到根据本发明的扁钢产品的钢材中,以便在钢材生产过程中对钢材进行脱氧处理。加入至少0.0005质量%的Ca能运行可靠地达到这一效果。
铬(“Cr”)在根据本发明的扁钢产品的钢中也用于提高强度。为此需要至少0.30质量%,尤其是至少0.40质量%的铬含量。为了降低明显的晶界氧化风险,根据本发明规定的铬含量范围的上限被限制在最多0.90质量%,尤其是最多0.80质量%。在铬含量超过0.80质量%的情况下,用于生产根据本发明的扁钢产品的方法应这样实施,即,设置至少840℃的退火温度GT,以便以运行可靠的方式获得所需的双相组织结构和根据本发明的扁钢产品所期望的机械性能。
钛(“Ti”)在根据本发明的扁钢产品的钢中的含量为0.020-0.080质量%,以便通过形成细小的Ti析出物,如TiC或Ti(C,N)析出物来提高强度,并获得细晶粒组织结构。为了特别可靠地达到这一效果,钛含量应设置为至少0.030质量%。通过根据本发明设置的钛含量所实现的析出量,有助于实现机械性能的最佳组合等,这也是根据本发明的钢材的特点。根据本发明的扁钢产品的钢中钛的存在的积极影响在钛含量最高0.07质量%时可尤其有效地利用。
根据本发明的扁钢产品的钢中Ti的作用还可以通过以下事实得到支持,即,Ti以最多相当于根据本发明的扁钢产品的钢中各个相应的N和B含量的11倍的量合金化。在该设计情况下对于钛含量%Ti适用的是:
%Ti≤11x(%N+%B)
其中,%N=相应的N含量,%B=相应的B含量。以这种方式限制钛含量,能得到最佳的钛析出量,同时又能防止形成硼氮化物,硼氮化物会对成形性产生负面影响。
硼(“B”)在根据本发明的扁钢产品的钢中的含量为0.0005-0.0020质量%,一方面是为了提高强度,另一方面也是为了不降低根据本发明的扁钢产品的变形性。
氮(“N”)在本发明的扁钢产品的钢中的含量限制在最高0.010质量%,由此Ti作为组织结构中的合金元素,而不会完全与N结合。在此设置至少为0.003质量%的N含量,以确保组织结构中有足够量的Ti(C,N)析出物。
在根据本发明的扁钢产品的钢中,允许含有在根据本发明生产的扁钢产品的实际经济生产中在技术上不可避免的杂质,但这些杂质应保持在较低水平,以便不会对根据本发明的扁钢产品的期望性能产生负面影响。
杂质包括磷(“P”)和硫(“S”)的含量。磷的含量限制在最多0.025质量%,尤其是低于0.015质量%,以避免焊接性劣化。S的含量限制在最多0.010质量%,以避免形成MnS或(Mn,Fe)S,其会对根据本发明的钢材的延展性产生负面影响。
在根据本发明的扁钢产品的钢中,杂质的总含量限制在最多0.5质量%,其中杂质总和最多为0.3质量%时,可特别可靠地避免扁钢产品的性能受损。
最高为0.20质量%的钼(“Mo”),最高为0.050质量%的铌(“Nb”),最高为0.10质量%的铜(“Cu”),最高为0.020质量%的钒(“V”),最高为0.10质量%的镍(“Ni”)可以选择性地合金化至根据本发明的钢中。这些元素的含量限制到其对于根据本发明的扁钢产品的特性仅有微不足道的影响的程度。因此,在技术意义上,它们也可以是“0%”,即含量低到被视为杂质,并且在根据本发明的扁钢产品中不起作用。
通过对根据本发明的扁钢产品的钢材的组成进行如上所述的根据本发明的调整,可以提供一种由双相钢组成的扁钢产品,其抗拉强度Rm为750-940MPa,屈服极限为440-650MPa,断裂伸长率A80超过13%,并且特征在于特别好的成型性能,同时边缘开裂倾向最小,焊接性同样良好。抗拉强度Rm、屈服极限Rp0.2和断裂伸长率A80均按照DIN ISO 6892标准测定(纵向拉伸方向,试样形状2)。
本发明与例如开头提到的由EP 2 031 081 B1中已知的现有技术的本质区别在于马氏体相和铁素体相中硬度值的分布以及根据本发明的扁钢产品组织结构的析出状态,该析出状态以大量细小析出物为特征。这种组织结构状态主要可以通过根据本发明限制的碳含量以及一定量的钛和硼的添加来实现。以这种方式,在扩孔试验中,随着变形梯度的增加,可获得高于平均水平的坚固性能。
根据本发明的扁钢产品的组织结构中的马氏体和铁素体,包括贝氏体铁素体通过图像分析进行定量。
在此,由于根据本发明的合金选择,根据本发明的扁钢产品组织结构中的马氏体含量限制在最多40体积%,其中至少有10体积%的马氏体存在,以确保所需的强度。
根据本发明的扁钢产品的组织结构的剩余部分除了不超过5体积%的残余奥氏体外,主要由铁素体,包括贝氏体铁素体占据,其不得超过90体积%,且至少为30体积%。
根据本发明的扁钢产品显示出特别好的成型性能,表现为超过20%的高扩孔率HER值(根据DIN ISO 16630标准测定),最大拉拔深度超过33mm(用100mm半圆冲头进行极限穹顶高度(LDH)试验测定)。这些都是通过早期局部强化实现的,该强化程度高于该强度等级的同类产品,并且表现为至少为0.22%的硬化指数n,根据DIN EN ISO 10275:2014在0.2%至2.2%的延伸区间内测量。
由于其特殊特性,根据本发明的扁钢产品尤其适用于生产轴向受力部件,如纵梁和横梁,或生产受弯曲应力的部件,如汽车车身的B柱、B柱加强件或门槛。
根据本发明,至少可以通过进行以下工作步骤生产根据本发明获得的冷轧扁钢产品:
a)熔化钢熔体,其以质量%计算的组成为C:0.040-0.100%,Mn:2.10-2.50%,Si:0.10-0.40%,Al:最高0.10%,Cr:0.30-0.90%,Ti:0.020-0.080%,B:0.0005-0.0020%,Ca:最高0.005%,P:最高0.025%,S:最高0.010%,N:0.003-0.010%,选择性最高0.20%的Mo,最高0.050%的Nb,最高0.10%的Cu,最高0.020%的V和最高0.10%的Ni,其余为铁和不可避免的杂质;
b)将熔体浇铸成预产品,如板坯或薄板坯;
c)将预产品进行热轧,热轧结束温度为850-980℃,制成热轧带材;
d)在480-650℃的卷取温度下卷取热轧带材;
e)对热轧带材进行酸洗;
f)将热轧带材以25-70%的总冷轧度冷轧成冷轧扁钢产品;
g)在连续炉中在780-920℃的退火温度GT下对冷轧扁钢产品进行退火处理;
h)将加热至退火温度GT的冷轧扁钢产品冷却至冷却结束温度KET 380-500℃,
其中,将加热至退火温度GT的冷轧扁钢产品冷却至冷却结束温度KET分两个阶段进行,其中冷轧扁钢产品在其冷却的第一阶段以大于1.5K/s的冷却速率AR1从各个相应的退火温度GT冷却至位于750-620℃范围内的中间温度ZT,在第二阶段以冷却速率AR2从中间温度ZT冷却至各个相应的冷却结束温度KET,对其成立:AR2>4x AR1
或
其中将加热到退火温度GT的冷轧扁钢产品冷却到冷却结束温度KET分两个阶段进行,其中冷轧扁钢产品在其冷却的第一阶段以大于5K/s的冷却速率AR1从各个相应的退火温度GT冷却到位于700-450℃范围内的中间温度ZT,并在第二阶段以冷却速率AR2从中间温度ZT冷却到各个相应的冷却结束温度KET,对其成立:AR2<(AR1)/3;
i)选择性地:将冷轧的扁钢产品从冷却结束温度KET冷却或加热至450-490℃的熔池进入温度BT,并使其通过由锌或锌合金组成的熔池,其中锌含量至少为75重量%;
j)将移出的冷轧扁钢产品冷却至室温,或将冷轧的扁钢产品从冷却结束温度KET冷却至室温;
k)选择性地:对冷轧的扁钢产品进行平整轧制,平整度为最大2%,优选为0.2-0.7%。
根据本发明进行合金化的熔体的熔化可采用与将熔体浇铸成预产品相同的常规方式进行,该预产品通常为板坯或薄板坯(步骤a)和b))。在这里,板坯的厚度通常为180mm至260mm,而薄板坯的厚度通常为40mm至60mm。
预产品的热轧也可以以常规方式在现有技术中已知的设备上进行。热轧结束温度设定为850-980℃,优选为880-950℃。
热轧后,得到的热轧带材冷却到480-650℃的卷取温度,并在此温度下卷绕成卷材。能够特别运行可靠地进行的卷取温度范围限制在最低500℃,最高600℃。在高于600℃的卷绕温度下,晶界氧化的风险会增加,从而导致扁钢产品的表面质量下降。卷取温度低于500℃时,热轧带材的强度会急剧增加,从而给后续变形带来困难。分别卷取的热轧扁钢产品均在卷材中冷却到室温。
之后,可选择对扁钢产品进行去氧化皮处理。例如,可以通过酸洗装置去除附着在扁钢产品上的氧化皮。
然后将经过选择性去氧化皮处理的热轧带材冷轧成冷轧扁钢产品,其中冷轧过程中达到的总冷轧度为KG=([冷轧前扁钢产品厚度-冷轧后扁钢产品厚度]/冷轧前扁钢产品厚度]x 100%)25-70%。
如果根据本发明的扁钢产品要通过热浸镀层涂上锌基防腐蚀层,则可根据a)-f)工作步骤生产冷轧扁钢产品,然后一次连续完成以下工作步骤:
g)在连续炉中在780-920℃的退火温度GT下对冷轧扁钢产品进行退火,以便在冷成型后达到足够的再结晶程度。在此,如果将退火温度设定为810-890℃,则可获得最佳退火效果。扁钢产品在退火炉中保持退火温度GT的典型退火时间Gt为10至1000s。
h)将加热至退火温度GT的冷轧扁钢产品冷却至380-500℃的冷却结束温度KET。
冷却分两个阶段进行:
根据第一种方法变体,冷轧扁钢产品在其冷却的第一阶段以大于1.5K/s的冷却速率AR1从各个相应的退火温度GT冷却到位于750-620℃范围内的中间温度ZT,并在第二阶段以冷却速率AR2从中间温度ZT冷却到冷却结束温度KET,对其成立:AR2>4x AR1。
另一方面,根据第二种方法变体,冷轧扁钢产品在其冷却的第一阶段以大于5K/s的冷却速率AR1从各个相应的退火温度GT冷却到位于700-450℃范围内的中间温度ZT,并在第二阶段以冷却速率AR2从中间温度ZT冷却到各个相应的冷却结束温度KET,对其成立:AR2<(AR1)/3。
通过选择第一和第二阶段中各个相应的冷却速率,可实现根据本发明的扁钢产品的所需的组织结构。
i)将冷轧扁钢产品从冷却结束温度KET冷却或加热至450-490℃的熔池进入温度BT,并将冷轧扁钢产品通过由锌或锌合金组成的熔池,其中对扁钢产品在离开熔池时形成的镀层厚度进行调整。熔池的组成可以按常规方式选择,其中熔池可以是纯锌熔液,或者由至少75重量%的锌组成。
j)将从熔池中移出的冷轧扁钢产品冷却至室温。
如果根据本发明的冷轧扁钢产品要保持无涂层或进行电解涂层,则在连续炉中在780-920℃之间的退火温度下进行退火处理,退火时间Gt在10-1000s之间。随后,将加热后的冷轧扁钢产品冷却至380-500℃范围内的冷却结束温度KET,冷却方式为将加热至退火温度GT的冷轧扁钢产品分两阶段冷却至冷却结束温度KET,其中,冷轧扁钢产品在其冷却的第一阶段以大于5K/s的冷却速率AR1从各个相应的退火温度GT冷却到位于700-450℃范围内的中间温度ZT,并在第二阶段以冷却速率AR2从中间温度ZT冷却到各个相应的冷却结束温度KET,对其成立:AR2<(AR1)/3。随后,冷轧扁钢产品冷却至室温。
可以选择性地对获得的、涂有防腐涂层或没有涂层的冷轧扁钢产品进行平整轧制,以优化其机械特性、表面性能和尺寸稳定性。为此,最大2%,特别是0.2-0.7%的成型度(“平整度”)已被证明是成功的。
具体实施方式
下面将通过实施例对本发明进行更详细的解释。
为了测试本发明,熔化了十种熔体A-J,其组成如表1所示。熔体A-J在传统的连铸设备中浇铸成板坯,然后热轧成热轧带材,分别卷绕成卷材,并冷却至室温。热轧带材随后进行酸洗并以总轧制度KG按传统方式冷轧成冷轧带材形式的冷轧扁钢产品。
为了给这样得到的冷轧扁钢产品涂覆锌基防腐蚀涂层,冷轧扁钢产品在各个相应的退火温度GT下退火相应的退火时间Gt。从退火温度GT开始,冷轧扁钢产品冷却至冷却结束温度KET。为此,扁钢产品分一步或两步冷却,其中第一阶段以冷却速率AR1冷却到中间温度ZT,然后在第二阶段从中间温度ZT开始,以冷却速率AR2冷却到冷却结束温度KET(表2)。
然后将冷却后的冷轧扁钢产品加热或冷却至熔池进入温度BT,并引导通过由至少75%的Zn组成的熔池。以这种方式通过热浸镀层涂覆在冷轧扁钢产品上的防腐蚀涂层的厚度以传统方式通过在扁钢产品离开熔池时吹掉多余的覆层材料进行调整。
在通过水或空气进行常规冷却至室温后,设置有防腐蚀涂层的扁钢产品将进行平整轧制,其中将其以0.2-0.7%的平整度进行平整轧制(平整度=[(平整轧制前的扁钢产品厚度-平整轧制后的扁钢产品厚度)/平整轧制前的扁钢产品厚度]x 100%)。
根据DIN ISO 6892标准(纵向拉伸方向,试样形状2),确定了由此获得的冷轧扁钢产品的抗拉强度Rm、屈服极限Rp0.2、伸长率A80并根据DIN ISO 16630标准确定扩孔率HER。根据DIN 50601:1985-08用光学显微镜测定了铁素体F和马氏体M的组织结构比例。如果存在的话,其余的组织结构由少量贝氏体和残余奥氏体组成,后者是根据DIN EN 13925(2003.07)标准通过无标准定量相分析法并借助里特维尔德细化法(Rietveldverfeinerung)确定的。相关特性见表3。
为了证明本发明在变形能力和扩孔性能方面的特殊效果,除了按照DIN ISO16630进行扩孔率HER试验外,还进行了以下研究:
用根据本发明的合金配方生产的钢带的抗拉强度Rm至少为750MPa,其特点是,如果以在180°至50°范围内变化的锥角进行试验,以目的性影响冲孔近边缘0mm至5mm宽的区域内的变形分布,则在锥角减小的扩孔试验中,实现了所测扩孔率的高于平均值的增加。
在这些试验中,冲孔是通过机械剪切产生的。为所有样品设置完全相同的切割参数。切割间隙的宽度位于被研究的扁钢产品的厚度的9-15%的范围内。通过使用相同冲裁的冲孔,可以排除切割过程的影响,并且所有冲头几何形状的条件都完全相同。
材料失效的特征是切边区域的整个钢板厚度出现缩颈或裂纹。由于使用了与DINISO 16630标准规定相比大得多的冲孔直径,这里为20mm,因此在1.0至2.0mm的典型板材厚度范围内,板材厚度的影响相对较小。通过几何换算到板材中心平面,不同冲头的扩孔值可以更好地进行比较。根据边缘处的“单轴拉伸”假设和测得的扩孔值,可按照表4中给出的关系计算板材厚度的减少。
边缘板材厚度[mm]=初始板材厚度xe(-0.5*LN((HER/100)+1)),
φ中心平面[mm]=φ失效时的钢板厚度+2x COS(锥角/2)x边缘钢板厚度/2,
中心平面HER[%]=[(φ中心平面HER-φ初始)/φ初始]x100%。
(另见图1)。
按照上述方式进行的扩孔试验所产生的影响可以通过有限元(FE)分析进行验证。失效时间点或可能的最大扩张量通过视频分析确定。为此使用摄像机从上方居中观察这一过程。通过使用远心镜头,可以在失效时间点之前测量出扩孔率或围绕各个相应孔的内边缘的直径,并作为相对于初始直径的百分比计算出扩孔率。视频胶片的帧频至少为每mm冲头行程10帧,冲头速度为1mm/s。
此外,为了评估拉伸区域中的整体成形能力,还在极限圆顶高度试验(LDH试验)中进行了冲制深度。如图2示意性所示,在该试验中,成形过程中完全抑制来自凸缘区域的材料流动,并且使用φ100mm的半圆冲头(Nakazima工具)对材料进行成形,直至材料失效(见图1)。压紧力设定为400kN,冲制速度设定为1.0mm/秒(+/-0.2)。
图3示出了图表,其中作为所使用的成形冲头相对于中心平面的开口角度的函数、根据上述换算示出了分别实现的扩孔率。经研究的板材的厚度分别为1.5mm。一方面,它们由根据表1中的熔体分析A按本发明制成的钢材组成(图2中相应的数值用圆圈表示,这些圆圈通过虚线彼此连接),另一方面,由名称为“DP800-DH”的传统钢材制成,其以质量%为单位的组成为0.157%C、1.98%Mn、0.114%Si、0.324%Al、0.106%Cr、0.004%Ti、0.0002%B、0.012%P、0.001%S、0.0038%N、0.02%Mo、0.022%Nb、0.01%Cu、0.001%V、0.02%Ni,其余为铁和不可避免的杂质。很明显,用根据本发明的材料制成的钢板样品的扩孔率明显优于用传统钢材制成的钢板样品。
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Claims (12)
1.抗拉强度为750-940MPa的冷轧扁钢平材,其钢基材
-由以下钢材组成,所述钢材以质量%计算的组成为C:0.040-0.100%,
Mn:2.10-2.50%,
Si:0.10-0.40%,
Cr:0.30-0.90%,
Ti:0.020-0.080%,
B:0.0005-0.0020%,
N:0.003-0.010%,
Al:最高0.10%,
Ca:最高0.005%,
P:最高0.025%,
S:最高0.010%,
选择性一种或多种下列元素:
Mo:最高0.20%,
Nb:最高0.050%,
Cu:最高0.10%,
V:最高0.020%,
Ni:最高0.10%,
其余为铁和不可避免的杂质,其中杂质的总含量限制在最多0.5质量%,并且杂质包括磷(“P”)和硫(“S”)的含量,并且
-具有双相组织结构,其由10-40体积%的马氏体、30-90体积%的铁素体,包括贝氏体铁素体、不超过5体积%的残余奥氏体组成,其余为生产过程中不可避免的其他组织结构成分。
2.根据权利要求1所述的扁钢产品,其特征在于,所述扁钢产品在0.2至2.2%的延伸区间内测得的硬化指数n至少为0.22%。
3.根据前述权利要求中任一项所述的扁钢产品,其特征在于,对于钛含量%Ti成立:
%Ti≤11x(%N+%B)
%N=各个相应的N含量,%B=各个相应的B含量。
4.根据前述权利要求中任一项所述的扁钢产品,其特征在于,其抗拉强度Rm为780-900MPa,屈服极限Rp0.2为440-650MPa,断裂伸长率A80超过13%(分别根据DIN ISO 6892(纵向拉伸方向,试样形状2)测定)。
5.根据前述权利要求中任一项所述的扁钢产品,其特征在于,根据DIN ISO 16630标准测定,其扩孔率HER超过20%。
6.根据权利要求5所述的扁钢产品,其特征在于,使用180°锥形冲头的扩孔率HER至少为15%,并且使用50°锥形冲头的扩孔率HER至少为25%。
7.根据前述权利要求中任一项所述的扁钢产品,其特征在于,在LDH试验中确定的冲制深度大于33mm。
8.根据前述权利要求中任一项所述的扁钢产品,其特征在于,所述扁钢产品涂有热浸镀层或电解施加的防腐蚀层。
9.用于生产根据前述权利要求中任一项所述的冷轧扁钢产品的方法,所述方法包括以下工作步骤:
a)熔化钢熔体,其以质量%计算的组成为C:0.040-0.100%,Mn:2.10-2.50%,Si:0.10-0.40%,Cr:0.30-0.90%,Ti:0.020-0.080%,B:0.0005-0.0020%,N:0.003-0.010%,Al:最高0.10%,Ca:最高0.005%,P:最高0.025%,S:最高0.010%,Mo:最高0.20%,Nb:最高0.050%,Cu:最高0.10%,V:最高0.020%,Ni:最高0.10%,其余为铁和不可避免的杂质;
b)将熔体浇铸成预产品,如板坯或薄板坯;
c)将预产品进行热轧,热轧结束温度为850-980℃,制成热轧带材;
d)在480-650℃的卷取温度下卷取热轧带材;
e)对热轧带材进行酸洗;
f)将热轧带材以25-70%的总冷轧度冷轧成冷轧扁钢产品;
g)在连续炉中在780-920℃的退火温度GT下对冷轧扁钢产品进行退火处理;
h)将加热至退火温度GT的冷轧扁钢产品冷却至冷却结束温度KET 380-500℃,
其中,将加热至退火温度GT的冷轧扁钢产品冷却至冷却结束温度KET分两个阶段进行,其中冷轧扁钢产品在其冷却的第一阶段以大于1.5K/s的冷却速率AR1从各个相应的退火温度GT冷却至位于750-620℃范围内的中间温度ZT,在第二阶段以冷却速率AR2从中间温度ZT冷却至各个相应的冷却结束温度KET,对其成立:AR2>4x AR1
或
其中将加热到退火温度GT的冷轧扁钢产品冷却到冷却结束温度KET分两个阶段进行,其中冷轧扁钢产品在其冷却的第一阶段以大于5K/s的冷却速率AR1从各个相应的退火温度GT冷却到位于700-450℃范围内的中间温度ZT,并在第二阶段以冷却速率AR2从中间温度ZT冷却到各个相应的冷却结束温度KET,对其成立:AR2<(AR1)/3;
i)选择性地:将冷轧的扁钢产品从冷却结束温度KET冷却或加热至450-490℃的熔池进入温度BT,并使其通过由锌或锌合金组成的熔池,其中锌含量至少为75重量%;
j)将移出的冷轧扁钢产品冷却至室温,或将冷轧的扁钢产品从冷却结束温度KET冷却至室温;
k)选择性地:对冷轧的扁钢产品进行平整轧制,平整度为最大2%,优选为0.2-0.7%。
10.根据权利要求9所述的方法,其特征在于,卷取温度为500-600℃。
11.根据权利要求9或10所述的方法,其特征在于,退火温度GT为810-890℃。
12.根据权利要求1至8中任一项所述的冷轧扁钢产品用于制造轴向受力部件,如纵梁和横梁,或用于制造弯曲受力部件,如汽车车身的B柱、B柱加强件或门槛的应用。
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