JP2020522614A - 改善された延性を備えた高強度鋼製部品の製造方法、及び前記方法により得られた部品 - Google Patents
改善された延性を備えた高強度鋼製部品の製造方法、及び前記方法により得られた部品 Download PDFInfo
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- JP2020522614A JP2020522614A JP2019566188A JP2019566188A JP2020522614A JP 2020522614 A JP2020522614 A JP 2020522614A JP 2019566188 A JP2019566188 A JP 2019566188A JP 2019566188 A JP2019566188 A JP 2019566188A JP 2020522614 A JP2020522614 A JP 2020522614A
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- steel sheet
- steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 196
- 239000010959 steel Substances 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims description 37
- 238000004519 manufacturing process Methods 0.000 title claims description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000002245 particle Substances 0.000 claims abstract description 51
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 44
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000011572 manganese Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011651 chromium Substances 0.000 claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 30
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010703 silicon Substances 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 24
- 239000010936 titanium Substances 0.000 claims abstract description 23
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 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 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 14
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 150000004767 nitrides Chemical group 0.000 claims abstract description 6
- 239000011159 matrix material Substances 0.000 claims abstract description 5
- 150000004763 sulfides Chemical group 0.000 claims abstract description 5
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002131 composite material Chemical group 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 29
- 229910052782 aluminium Inorganic materials 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 27
- 229910000838 Al alloy Inorganic materials 0.000 claims description 15
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- 230000009466 transformation Effects 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 13
- 239000010955 niobium Substances 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
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- 239000011701 zinc Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 9
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 8
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
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- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
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- 238000012360 testing method Methods 0.000 description 53
- 230000007797 corrosion Effects 0.000 description 26
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- 229910052748 manganese Inorganic materials 0.000 description 22
- 239000010410 layer Substances 0.000 description 21
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 20
- 229910001566 austenite Inorganic materials 0.000 description 13
- 230000003111 delayed effect Effects 0.000 description 13
- 238000005336 cracking Methods 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 8
- 238000007792 addition Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
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- 238000005259 measurement Methods 0.000 description 5
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- 230000008569 process Effects 0.000 description 4
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
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- 238000003466 welding Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 230000002787 reinforcement Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- KJNJCRABCUHOJK-UHFFFAOYSA-N [Pb].[P] Chemical compound [Pb].[P] KJNJCRABCUHOJK-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical group [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
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- 230000002939 deleterious effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 238000005496 tempering Methods 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- C22C—ALLOYS
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- 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
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
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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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- 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
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- 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
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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
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- C21D1/673—Quenching devices for die 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
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- C21D6/001—Heat treatment of ferrous alloys containing 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
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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
- C21D6/008—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
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- C21D6/02—Hardening by precipitation
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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
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- 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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- 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
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- 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
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
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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
- 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
- C21D8/0273—Final recrystallisation annealing
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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
- C21D8/0421—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
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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
- C21D8/0421—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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Abstract
Description
0.24%≦C≦0.38%及び0.40%≦Mn≦3%、
又は0.38%<C≦0.43%及び0.05%≦Mn<0.4%
0.10%≦Si≦1.70%
0.015%≦Al≦0.070%
0%≦Cr≦2%
0.25%≦Ni≦2%
0.015%≦Ti≦0.10%
0%≦Nb≦0.060%
0.0005%≦B≦0.0040%
0.003%≦N≦0.010%
0.0001%≦S≦0.005%
0.0001%≦P≦0.025%
を含むことを特徴とし、
前記チタン及び窒素含量が:
Ti/N>3.42
を満たし、且つ
前記炭素、マンガン、クロム及びケイ素含量が
前記化学組成は、任意選択的に、次の元素:
0.05%≦Mo≦0.65%
0.001%≦W≦0.30%
0.0005%≦Ca≦0.005%
の内の1種又は複数を含み、残部は、鉄及び処理により生じた不可避的不純物であり、
前記鋼板は、前記鋼板の表面近傍の深さΔまで前記鋼の任意の位置でニッケル含量Nisurfを有し、ただし:
Nisurf>Ninom
であり、Ninomは前記鋼の公称ニッケル含量を意味し、
且つ、Nimaxは、Δ内の最大ニッケル含量を意味し:
前記深さΔは、マイクロメートルで表され、
前記Nimax及びNinom含量は、重量%で表され、
並びに全ての粒子の表面密度Di及び2μmより大きい粒子の表面密度D(>2μm)は、前記鋼板の表面の近傍の少なくとも100マイクロメートルの深さまで、
Di+6.75D(>2μm)<270
を満たし、Di及びD(>2μm)は、1平方ミリメートル当たりの粒子の数として表され、前記粒子は、鋼マトリックス中に存在する全ての純粋な酸化物、硫化物、窒化物、又はオキシ硫化物及び炭窒化物などの複合型を意味する。
・組成は、重量で:
0.39%≦C≦0.43%
0.09%≦Mn≦0.11%
を含む
・組成は、重量で:
0.95%≦Cr≦1.05%
を含む
・組成は、重量で:
0.48%≦Ni≦0.52%
を含む
・組成は、重量で:
1.4%≦Si≦1.70%
を含む
・鋼板のミクロ組織は、フェライト−パーライトである。
Di+6.75D(>2μm)<270
を満たすことが前提であり、ここで、
Di及びD(>2μm)は1mm2当たりの粒子の数で表される。
・部品は、圧延方向で、50°を超える曲げ角度を有する。
を満たし、降伏強度σγは1300MPa〜1600Mpaの間であり、
Csccは非コート鋼板では1に等しく、コート鋼板では0.7に等しい。
を満たす。
・マンガン、ケイ素、ニオブ及びクロムが添加される液体状鋼を製造するステップであって、添加が真空チャンバー中で行われるステップ、次に、
・液体状金属をその窒素含量を増やすことなく脱硫するステップ、次に、
・チタンを添加するステップであって、前記添加が以前に定義した化学組成の液体状金属が得られるように行われるステップ、次に、
・半製品を鋳造するステップ、次に、
・前記半製品を1250℃〜1300℃の間の温度で、20分〜45分の間の保持時間加熱するステップ、次に、
・前記半製品を825℃〜950℃の間の圧延終了温度TFLに熱間圧延し、熱間圧廷鋼板を得るステップ、次に
・前記熱間圧廷鋼板を500℃〜750℃の間の温度で巻き取って、熱間圧廷したコイル状鋼板を得るステップ、次に、
・前のステップで形成された酸化物層を酸洗いするステップ。
・上記方法で製造された、熱間圧廷したコイル状の酸洗鋼板を供給するステップ、次に
・前記熱間圧廷したコイル状の酸洗熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得るステップ、次に
・740℃〜820℃の間の温度で、前記冷間圧延鋼板を焼鈍し、冷間圧延焼鈍鋼板を得るステップ。
・前に定義した2つの工程のいずれかによる圧延鋼板が供給され、その後、焼戻されたアルミニウム合金又はアルミニウム系合金で連続的プレコーティングが実施され、次に
・プレコートが遊離アルミニウム、τ5相Fe3Si2Al12及びτ6相Fe2Si2Al9を含まないように、前記プレコート鋼板の熱前処理が実施される。
・前に定義したものなどの方法により製造された鋼板を供給するステップ、次に、
・前記鋼板を切断して、ブランクを得るステップ、次に、
・任意選択的に、前記ブランクをコールドスタンピングすることによる成型ステップを実施するステップ、次に、
・前記ブランクを810℃〜950℃の間の温度に加熱し、鋼中で完全オーステナイト組織を得るステップ、次に
・ブランクをプレスに移すステップ、次に、
・前記ブランクをホットスタンピングし、部品を得るステップ、次に、
・前記部品をプレス内で保持し、前記オーステナイト組織のマルテンサイト変態により硬化させるステップ。
・マンガン含量が0.4%〜3%の間である場合、0.24%〜0.38%の間の炭素含量。炭素は、オーステナイト化処理後の冷却後に得られる焼入れ性及び機械的強度において主要な役割を果たす。0.24重量%の含量未満では、プレスハードニングによる硬化後に、高価な元素の添加をしないで、1800MPaの機械的強度を実現することはできない。マンガン含量0.4%〜3%の間の場合に、0.38重量%の含量を超えると、遅延亀裂のリスクが増大し、シャルピー型ノッチ付曲げ試験を用いて測定して、延性/脆性遷移温度が−40℃を超える可能性があり、これは、靱性の極端な低下を表す。炭素含量0.32重量%〜0.36重量%の間は、安定的に、満足できるレベルの溶接性を維持し、製造コストを抑えながら、目標特性が得られる。炭素含量が0.24%〜0.38%の間である場合、スポット溶接性が特に良好である。
・0.40%〜0.80%の間のMn含量及び0.05%〜1.20%の間のクロム含量と併せて、炭素含量が0.32重量%〜0.36重量%の間の場合、これにより、特に効果的なニッケル富化表面層の存在に起因して優れた遅延亀裂に対する耐性、及び非常に良好な鋼板の機械的切断特性が同時に得られる。高い機械的強度と遅延亀裂に対する耐性を組み合わせるためには、Mn含量は、0.50%〜0.70%の間が理想的である。
・引き続く圧延ステップにより付与される圧延比による厚さの減少、
・引き続く製造段階中に高温に鋼板を曝露することによる厚さの増加、
を同時に受ける。しかし、この増加は、スラブ加熱段階中よりも少ない程度で発生する。
・1250℃〜825℃の範囲の温度での熱間圧延ステップ(荒加工、仕上げ)、
・500℃〜750℃の範囲の温度での巻き取りステップ、を含む。
Y=−6.75(X−40)
に基づいて得られる。
Di+6.75D(>2μm)<270
Di及びD(>2μm)の両方は、1mm2当たりの粒子の数で表される。
本発明者らはまた、炭素含量の大きな増加に付随して起こるマンガン含量の低減は、鋼部品の耐応力腐食性を実質的に高め、同時に、1800MPaを超える高い機械的強度を維持することを可能とすることを発見した。
・この方法により応力を加えられた鋼部品の室温での30日間の食塩水中への浸漬、又は
・応力を加えられた鋼部品上への35℃で4時間の食塩水の噴霧で、この操作を20日間にわたる反復、
による4点定荷重曲げ試験を用いる方法により実施されることは既知である。
・30分間の1275℃の温度までの加熱
・900℃の圧延終了温度TFLまでの熱間圧延
・巻き取り温度:参照試験Hは540℃、参照試験I及びJは550℃、参照試験Kは580℃での巻き取り、
・圧延比58%での冷間圧延、
・硬化金属の再結晶化が得られるように、760℃の温度での焼鈍、及び
・冷却。
P1=455Exp(−0.5[Mn+25P])+[390Cr+50Mo]+7Exp(1.3Si)、
含量は重量%として表される。
P2=[6−1.22x10−9σγ 3]
式中、σγは、MPaで表される降伏強度を意味し、1300MPa〜1600MPaの間である。
Claims (23)
- プレスハードニング用圧延鋼板であって、化学組成が、重量で含量を表して、
0.24%≦C≦0.38%及び0.40%≦Mn≦3%、
又は0.38%<C≦0.43%及び0.05%≦Mn<0.4%
0.10%≦Si≦1.70%
0.015%≦Al≦0.070%
0%≦Cr≦2%
0.25%≦Ni≦2%
0.015%≦Ti≦0.10%
0%≦Nb≦0.060%
0.0005%≦B≦0.0040%
0.003%≦N≦0.010%
0.0001%≦S≦0.005%
0.0001%≦P≦0.025%
を含み、
前記チタン及び窒素含量が
Ti/N>3.42
を満たし、且つ
前記炭素、マンガン、クロム及びケイ素含量が
前記化学組成が、任意選択的に、次の元素:
0.05%≦Mo≦0.65%、
0.001%≦W≦0.30%
0.0005%≦Ca≦0.005%
の内の1種又は複数を含み、
残部は、鉄及び処理により生じた不可避的不純物であり、
前記鋼板が、前記鋼板の表面近傍の深さΔまでの前記鋼の任意の位置でニッケル含量Nisurfを有し、ただし:
Nisurf>Ninom
であり、
Ninomは前記鋼の公称ニッケル含量を意味し、
且つ、Nimaxは、Δ内の最大ニッケル含量を意味し
前記深さΔは、マイクロメートルで表され、
前記Nimax及びNinom含量は、重量%で表され、
並びに全ての粒子の表面密度Di及び2μmより大きい粒子の表面密度D(>2μm)が、前記鋼板の表面の近傍の少なくとも100マイクロメートルの深さまで、
Di+6.75D(>2μm)<270
を満たし、
Di及びD(>2μm)は、1平方ミリメートル当たりの粒子の数として表され、前記粒子は、鋼マトリックス中に存在する全ての純粋な酸化物、硫化物、窒化物、又はオキシ硫化物及び炭窒化物などの複合型を意味する、鋼板。 - 組成が、重量で
0.39%≦C≦0.43%
0.09%≦Mn≦0.11%
を含むことを特徴とする、請求項1に記載の鋼板。 - 組成が、重量で
0.95%≦Cr≦1.05%
を含むことを特徴とする、請求項1及び2のいずれかに記載の鋼板。 - 組成が、重量で
0.48%≦Ni≦0.52%
を含むことを特徴とする、請求項2及び3のいずれかに記載の鋼板。 - 組成が、重量で
1.4%≦Si≦1.70%
を含むことを特徴とする、請求項2〜4のいずれかに記載の鋼板。 - ミクロ組織が、フェライト−パーライトであることを特徴とする、請求項1〜5のいずれかに記載の鋼板。
- 前記鋼板が、熱間圧廷鋼板であることを特徴とする、請求項1〜6のいずれかに記載の鋼板。
- 前記鋼板が、冷間圧延され、且つ焼鈍された鋼板であることを特徴とする、請求項1〜7のいずれかに記載の鋼板。
- アルミニウム又はアルミニウム合金又はアルミニウム系金属層でプレコートされていることを特徴とする、請求項1〜8のいずれかに記載の鋼板。
- 亜鉛又は亜鉛合金又は亜鉛系金属層でプレコートされていることを特徴とする、請求項1〜9のいずれかに記載の鋼板。
- アルミニウム及び鉄、並びに任意選択的にケイ素を含む金属間化合物合金の1つ又は複数の層でプレコートされ、前記プレコーティングが、遊離アルミニウム、τ5相Fe3Si2Al12及びτ6相Fe2Si2Al9を含まないことを特徴とする、請求項1〜10のいずれかに記載の鋼板。
- 請求項1〜5のいずれかに記載の組成の鋼板をプレスハードニングすることにより得られる部品であって、マルテンサイト又はマルテンサイト−ベイナイト組織を有すること、機械的強度Rmが1800MPa以上であること、及び全ての粒子の表面密度Di及び2マイクロメートルより大きい粒子の表面密度D(>2μm)が、前記鋼板の表面の近傍の少なくとも100マイクロメートルの深さまで
Di+6.75D(>2μm)<270
を満たし、
Di及びD(>2μm)が、1mm2当たりの粒子の数として表されることを特徴とする、部品。 - 圧延方向で、50°を超える曲げ角度を少なくとも有することを特徴とする、請求項12に記載のプレスハードニングされた部品。
- マンガン、リン、クロム、モリブデン及びケイ素含量が、
[455Exp(−0.5[Mn+25P])+[390Cr+50Mo]+7Exp(1.3Si)][6−1.22x10−9σγ 3][Cscc]≧750
を満たし、
σγは1300MPa〜1600Mpaの間である降伏強度であり、
Csccは非コート鋼板では1に等しく、コート鋼板では0.7に等しいことを特徴とする、請求項12及び13のいずれかに記載のプレスハードニングされた部品。 - マンガン、リン、クロム、モリブデン及びケイ素含量が:
[455Exp(−0.5[Mn+25P])+[390Cr+50Mo]+7Exp(1.3Si)][6−1.22x10−9σγ 3][Cscc]≧1100
を満たすことを特徴とする、請求項14に記載のプレスハードニングされた部品。 - プレスハードニングの熱処理中の鋼基材と前記プレコートとの間の拡散により生じたアルミニウム合金若しくはアルミニウム系合金、又は亜鉛合金若しくは亜鉛系合金でコートされていることを特徴とする、請求項12〜16のいずれかに記載のプレスハードニングされた部品。
- 熱間圧廷鋼板の製造方法であって、以下の連続ステップ:
・マンガン、ケイ素、ニオブ及びクロムが添加される液体状鋼を製造するステップであって、前記添加が真空チャンバー中で行われるステップ、次に、
・液体状金属をその窒素含量を増やすことなく脱硫するステップ、次に、
・チタンを添加するステップであって、前記添加が請求項1〜5のいずれかに記載の化学組成を有する液体状金属が得られるように行われるステップ、次に、
・半製品を鋳造するステップ、次に、
・前記半製品を1250℃〜1300℃の間の温度で、20分〜45分の間の保持時間加熱するステップ、次に、
・前記半製品を825℃〜950℃の間の圧延終了温度TFLに熱間圧延し、熱間圧廷鋼板を得るステップ、次に
・前記熱間圧廷鋼板を500℃〜750℃の間の温度で巻き取って、熱間圧廷したコイル状鋼板を得るステップ、次に、
・前のステップで形成された酸化物層を酸洗いするステップ、
を含む、方法。 - 冷間圧延及び焼鈍した鋼板の製造方法であって、以下の連続ステップ:
・請求項18に記載の方法で製造された、熱間圧廷したコイル状の酸洗鋼板を供給するステップ、次に
・前記熱間圧廷したコイル状の酸洗熱間圧延鋼板を冷間圧延し、冷間圧延鋼板を得るステップ、次に
・740℃〜820℃の間の温度で、前記冷間圧延鋼板を焼鈍し、冷間圧延焼鈍鋼板を得るステップ、
を含むことを特徴とする、方法。 - プレコート鋼板の製造方法であって、請求項18又は19に記載の方法により製造された圧延鋼板が供給され、次に、浸漬により連続的プレコーティングが実施され、前記プレコーティングが、アルミニウム若しくはアルミニウム合金若しくはアルミニウム系合金、又は亜鉛若しくは亜鉛合金若しくは亜鉛系合金である、方法。
- プレコート及びプレアロイ化された鋼板の製造方法であって:
・請求項19又は20に記載の方法により圧延鋼板が供給され、次に、焼戻されたアルミニウム合金又はアルミニウム系合金で連続的プレコーティングが実施され、次に
・前記プレコートが遊離アルミニウム、τ5相Fe3Si2Al12及びτ6相Fe2Si2Al9を含まないように、前記プレコート鋼板の熱前処理が実施される、方法。 - 請求項12〜17のいずれかに記載のプレスハードニングされた部品の製造方法であって、以下の連続ステップ:
・請求項18〜21のいずれかに記載の方法により製造された鋼板を供給するステップ、次に、
・前記鋼板を切断して、ブランクを得るステップ、次に、
・任意選択的に、前記ブランクをコールドスタンピングすることによる成形ステップを実施するステップ、次に、
・前記ブランクを810℃〜950℃の間の温度に加熱し、前記鋼中で完全オーステナイト組織を得るステップ、次に
・前記ブランクをプレスに移すステップ、次に、
・前記ブランクをホットスタンピングし、部品を得るステップ、次に、
・前記部品をプレス内で保持し、前記オーステナイト組織のマルテンサイト変態により硬化させるステップ、
を含む、方法。 - 請求項12〜17のいずれかに記載された又は請求項22に記載の方法に従って製造された、プレスハードニングされた部品の、自動車用の構造又は強化部品の製造のための使用。
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