WO2022195024A1 - Bande, feuille ou ébauche d'acier et procédé de production d'une pièce formée à chaud ou d'une pièce préformée traitée à chaud - Google Patents
Bande, feuille ou ébauche d'acier et procédé de production d'une pièce formée à chaud ou d'une pièce préformée traitée à chaud Download PDFInfo
- Publication number
- WO2022195024A1 WO2022195024A1 PCT/EP2022/057019 EP2022057019W WO2022195024A1 WO 2022195024 A1 WO2022195024 A1 WO 2022195024A1 EP 2022057019 W EP2022057019 W EP 2022057019W WO 2022195024 A1 WO2022195024 A1 WO 2022195024A1
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- WO
- WIPO (PCT)
- Prior art keywords
- steel
- hot
- formed part
- blank
- temperature
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 178
- 239000010959 steel Substances 0.000 title claims abstract description 178
- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000012535 impurity Substances 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 41
- 229910000859 α-Fe Inorganic materials 0.000 claims description 32
- 229910000734 martensite Inorganic materials 0.000 claims description 26
- 238000005452 bending Methods 0.000 claims description 23
- 229910001563 bainite Inorganic materials 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 239000011247 coating layer Substances 0.000 claims description 11
- 239000010410 layer Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 description 19
- 238000000137 annealing Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 18
- 229910001566 austenite Inorganic materials 0.000 description 15
- 238000003303 reheating Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000009466 transformation Effects 0.000 description 10
- 238000005275 alloying Methods 0.000 description 8
- 239000010955 niobium Substances 0.000 description 7
- 229910052796 boron Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 238000007571 dilatometry Methods 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000930 thermomechanical effect Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910000712 Boron steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 241001387976 Pera Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007656 fracture toughness test Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 2
- 235000010262 sodium metabisulphite Nutrition 0.000 description 2
- 239000004296 sodium metabisulphite Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 241000169624 Casearia sylvestris Species 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000009844 basic oxygen steelmaking Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000009845 electric arc furnace steelmaking Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000010297 mechanical methods and process 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
- 230000003287 optical effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—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
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—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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- 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
- C23C2/12—Aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- This invention relates to a steel strip, sheet or blank for producing a hot-formed part or a heat-treated pre-formed part, and to a method for hot-forming a steel blank or heat-treating a pre-formed part into an article and the use thereof.
- the steel In cold-stamping or cold-forming processes, the steel is shaped into a product at near-room temperature.
- Steel products produced in this way are for instance dual phase (DP) steels which have a ferritic-martensitic microstructure.
- DP steels display a high ultimate tensile strength, their bendability and yield strength are low which is undesirable since these reduce crash performance in service.
- Fracture toughness measurement is a useful tool to indicate the crash energy absorption of steels. When the fracture toughness parameters are high, generally a good crash behaviour is obtained. In view of the above, it will be clear that there is a need for steel parts that display an excellent ultimate tensile strength, and at the same time an excellent yield strength, bendability and fracture toughness, and in turn excellent crash energy absorption.
- Alloying elements are elements that are deliberately added or allowed in the steel to provide a desirable effect. Boron and niobium are deemed not to provide a desirable effect in the steel according to the invention. Any boron or niobium that is present in the steel is to be qualified as inevitable impurities resulting from the Basic Oxygen Steelmaking (BOS) or the Electric Arc Furnace (EAF) process.
- BOS Basic Oxygen Steelmaking
- EAF Electric Arc Furnace
- inevitable or unavoidable impurities mean that the low alloy steel does not contain any deliberately added elements other than those specified, and that the inevitable or unavoidable impurities are present only as a result of a technical or economical inability to remove them completely from the steel melt during the BOS- or EAF-process.
- Carbon is added as the main strengthening element and also to promote hardenability.
- C increases strength by distorting the cubic BCC lattice and converting it to a BCT lattice.
- In bainite which is a mixture of ferrite and carbides, C strengthens the ferrite by solid solution hardening. According to the invention the carbon content is 0.07 to 0.20 wt.%.
- Manganese and silicon are added also to increase the hardenability.
- Mn causes solid solution hardening as well.
- Mn below the limit will give insufficient hardenability and above the limit will make the steel difficult to process - as for example in terms of rolling, hot dip galvanising.
- Si also causes solid solution strengthening.
- the chromium content in the steel is at most 0.050 wt.%, and preferably it is present only as an inevitable impurity, i.e. it is not added as an alloying element.
- the chromium content in the steel is at most 0.040 wt.%, and preferably is at most 0.020 wt.%. in some embodiment the chromium content in the steel is at most 0.010 wt.%.
- the chromium content in the steel is lower than 0.0001 wt %, preferably there is no chromium present in the steel according to the invention.
- the carbon content is at least 0.10 wt.%, preferably at least 0.12 wt.%.
- the steel strip, sheet or blank is provided with a metallic coating layer such as a (commercially pure) aluminium layer or an aluminium alloy layer.
- a typical metal bath for a hot dip coating such an aluminium layer comprises of aluminium alloyed with silicon e.g. aluminium alloyed with 8 to 11 wt.% of silicon and at most 4 wt.% of iron, optionally at most 0.2 wt.% of one or more additional elements such as calcium, unavoidable impurities, the remainder being aluminium.
- Silicon is present in order to prevent the formation of a thick iron-intermetallic layer which reduces adherence and formability.
- Iron is preferably present in amounts between 1 and 4 wt.%, more preferably at least 2 wt.%.
- the hot-formed part or heat- treated pre-formed part produced from a steel strip, sheet or blank according to any one of the preceding claims, wherein the hot-formed part has a tensile strength of at least 700 MPa, preferably of at least 750 MPa.
- a method for hot-forming a steel blank or heat-treating a pre-formed part into an article comprising the steps of:
- Arl is the temperature at which the austenite to ferrite transformation completes during cooling of the steel and Mf is the martensite transformation finish temperature.
- thermo-mechanical routes A, B or C which all benefit from the specific chemical composition designed in this invention.
- the difference between the three different thermo-mechanical routes lies in the combination or separation of the mechanical and the thermal part of the thermo-mechanical route.
- Route A heating a steel blank to achieve the austenite or austenite + ferrite state, deform it to its final shape while it is in the defined state (> Arl) and cool it to transform the austenite into the desired microstructure (direct hot-forming of the article), or
- the method according to the invention includes a paint baking treatment, used after painting hot-formed component, for instance an additional ageing treatment at about 170-200°C for 20 minutes.
- Example 1 As substrates the materials according to table 1 were used.
- the inventive steel was cast and processed into cold-rolled strips with a gauge of 1.5 mm through reheating the cast steel to 1200°C, hot-rolling (Finish Rolling Temperature 900°C) to a final hot- rolled thickness of 4 mm. After finish rolling the steel was cooled on the run-out table at 25 °C/s to 700°C and simulated for coil cooling (i.e. coiling). After pickling the hot- rolled strips were cold-rolled to 1.5 mm.
- the comparative steels of DP1000 and DP800 which are two cold-formable commercial steels, were also processed to the same condition (cold-rolled 1.5 mm gauge) and continuously annealed to achieve their mechanical properties as specified in the well-known industry specifications such as in VDA 239-100.
- Table 1 Steel chemistry in wt.% (balance Fe and inevitable impurities).
- Blanks of dimensions 220 mm x 110 mm x 1.5 mm, were prepared from the cold- rolled material and were subjected to reheating to 900°C (10°C below Ac3) and 940°C (30°C above Ac3) and were soaked for 5 min. in a nitrogen atmosphere to minimize surface degradation, transferred resulting in a temperature drop of 120°C in 10s and then subjected to cooling to about 160°C in the following rates: 30, 40, 50, 60, 80, 200°C/s. From the heat-treated samples, A50 tensile specimens along the rolling direction were prepared and tested with quasi-static strain rate (EN10002 standard). Microstructures were characterized from the RD-ND planes (RD and ND stand for rolling direction and normal direction respectively).
- Table 3 shows that the ultimate tensile strength (UTS) greater than 700 MPa was achieved for all the cooling rates.
- the yield strength (YS) increases with increasing cooling rate for both reheating temperatures since the amount of martensite increased in the microstructure with cooling rate.
- Microstructures are either fully martensitic or a mixture of martensite, bainite and small amount of ferrite. High bending angles, greater than at least 115° at 1 mm thickness are also achieved as shown in Table 4 for both the specimen orientations.
- the high performance of the invented steel in comparison with the available steels of similar strength is due to the higher bending angle and higher fracture toughness properties.
- the component needs to fold, to be able to absorb energy without fracture, which is determined by its bendability.
- the energy absorption capability before failure is determined by its fracture toughness parameters.
- the improvements in these properties of the invented steel have been possible by virtue of the inventive steel chemistry design that provided the suitable microstructures, as defined in this invention, through the defined hot-forming processes.
- Table 5 Tensile properties and bendability. hot pressed (900°C reheating with 200°C/s cooling rate) and baked.
- Bending specimens (40 mm x 30 mm x 1.5 mm) from both parallel to rolling direction and perpendicular to rolling direction were prepared from each of the conditions and tested till fracture by three-point bending test according to the VDA 238-100 standard. These samples with bending axis parallel to the rolling direction are identified as longitudinal (L) bending specimens.
- FIG. 3 Experimental details of the direct hot-forming experiments. Same temperature schedule is used for indirect hot-forming at a different timescale. Some critical temperatures, cooling rates, durations and process stages are indicated.
- Figure 4 Graphical presentation of the mechanical property data in Table 3 after annealing at (a) 900 or (b) 940°C.
- Left Y-axis - Open square tensile strength (Rm), open circles: yield strength (Rp);
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280028300.3A CN117120636A (zh) | 2021-03-17 | 2022-03-17 | 钢带材、片材或坯料以及用于生产热成形零件或热处理的预成形零件的方法 |
EP22718071.8A EP4308736A1 (fr) | 2021-03-17 | 2022-03-17 | Bande, feuille ou ébauche d'acier et procédé de production d'une pièce formée à chaud ou d'une pièce préformée traitée à chaud |
KR1020237033887A KR20230157997A (ko) | 2021-03-17 | 2022-03-17 | 열간-성형 부품 또는 열처리 사전성형 부품을 제조하는 방법과 강철 스트립, 시트 또는 블랭크 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP21163271 | 2021-03-17 | ||
EP21163271.6 | 2021-03-17 |
Publications (1)
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WO2022195024A1 true WO2022195024A1 (fr) | 2022-09-22 |
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PCT/EP2022/057019 WO2022195024A1 (fr) | 2021-03-17 | 2022-03-17 | Bande, feuille ou ébauche d'acier et procédé de production d'une pièce formée à chaud ou d'une pièce préformée traitée à chaud |
Country Status (4)
Country | Link |
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EP (1) | EP4308736A1 (fr) |
KR (1) | KR20230157997A (fr) |
CN (1) | CN117120636A (fr) |
WO (1) | WO2022195024A1 (fr) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1490535A (en) | 1973-11-06 | 1977-11-02 | Norrbottens Jaernverk Ab | Manufacturing a hardened steel article |
EP2708613A1 (fr) * | 2011-05-13 | 2014-03-19 | Nippon Steel & Sumitomo Metal Corporation | Article moulé estampé à chaud et son procédé de production, élément d'absorption d'énergie et son procédé de production |
EP2719786A1 (fr) * | 2011-06-10 | 2014-04-16 | Kabushiki Kaisha Kobe Seiko Sho | Article moulé par pressage à chaud, procédé pour produire celui-ci, et tôle d'acier mince pour moulage à la presse à chaud |
EP2728027A1 (fr) * | 2011-06-30 | 2014-05-07 | Hyundai Steel Company | Acier thermodurci ayant une excellente résistance aux chocs et procédé de fabrication de pièces thermodurcissables au moyen dudit acier |
EP2886674A1 (fr) * | 2012-08-15 | 2015-06-24 | Nippon Steel & Sumitomo Metal Corporation | Tôle d'acier pour formage à chaud à la presse, son procédé de production, et élément de tôle d'acier pour formage à chaud à la presse |
EP3235923A1 (fr) * | 2014-12-19 | 2017-10-25 | Baoshan Iron & Steel Co., Ltd. | Acier à haute résistance, dont la limite d'élasticité est de 800 mpa et son procédé de production |
WO2019223854A1 (fr) * | 2018-05-22 | 2019-11-28 | Thyssenkrupp Steel Europe Ag | Pièce façonnée en tôle composée d'acier et présentant une résistance élevée à la traction, et procédé de fabrication de ladite pièce |
EP3611288A1 (fr) * | 2018-04-28 | 2020-02-19 | Ironovation Materials Technology Co., Ltd. | Composant estampé à chaud, plaque d'acier prérevêtue pour estampage à chaud et procédé d'estampage à chaud |
WO2020239891A1 (fr) * | 2019-05-28 | 2020-12-03 | Tata Steel Ijmuiden B.V. | Bande, tôle ou ébauche en acier pour la fabrication d'une pièce estampée à chaud, et procédé d'estampage à chaud d'une ébauche pour former une pièce |
-
2022
- 2022-03-17 KR KR1020237033887A patent/KR20230157997A/ko unknown
- 2022-03-17 WO PCT/EP2022/057019 patent/WO2022195024A1/fr active Application Filing
- 2022-03-17 CN CN202280028300.3A patent/CN117120636A/zh active Pending
- 2022-03-17 EP EP22718071.8A patent/EP4308736A1/fr active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1490535A (en) | 1973-11-06 | 1977-11-02 | Norrbottens Jaernverk Ab | Manufacturing a hardened steel article |
EP2708613A1 (fr) * | 2011-05-13 | 2014-03-19 | Nippon Steel & Sumitomo Metal Corporation | Article moulé estampé à chaud et son procédé de production, élément d'absorption d'énergie et son procédé de production |
EP2719786A1 (fr) * | 2011-06-10 | 2014-04-16 | Kabushiki Kaisha Kobe Seiko Sho | Article moulé par pressage à chaud, procédé pour produire celui-ci, et tôle d'acier mince pour moulage à la presse à chaud |
EP2728027A1 (fr) * | 2011-06-30 | 2014-05-07 | Hyundai Steel Company | Acier thermodurci ayant une excellente résistance aux chocs et procédé de fabrication de pièces thermodurcissables au moyen dudit acier |
EP2886674A1 (fr) * | 2012-08-15 | 2015-06-24 | Nippon Steel & Sumitomo Metal Corporation | Tôle d'acier pour formage à chaud à la presse, son procédé de production, et élément de tôle d'acier pour formage à chaud à la presse |
EP3235923A1 (fr) * | 2014-12-19 | 2017-10-25 | Baoshan Iron & Steel Co., Ltd. | Acier à haute résistance, dont la limite d'élasticité est de 800 mpa et son procédé de production |
EP3611288A1 (fr) * | 2018-04-28 | 2020-02-19 | Ironovation Materials Technology Co., Ltd. | Composant estampé à chaud, plaque d'acier prérevêtue pour estampage à chaud et procédé d'estampage à chaud |
WO2019223854A1 (fr) * | 2018-05-22 | 2019-11-28 | Thyssenkrupp Steel Europe Ag | Pièce façonnée en tôle composée d'acier et présentant une résistance élevée à la traction, et procédé de fabrication de ladite pièce |
WO2020239891A1 (fr) * | 2019-05-28 | 2020-12-03 | Tata Steel Ijmuiden B.V. | Bande, tôle ou ébauche en acier pour la fabrication d'une pièce estampée à chaud, et procédé d'estampage à chaud d'une ébauche pour former une pièce |
Also Published As
Publication number | Publication date |
---|---|
EP4308736A1 (fr) | 2024-01-24 |
KR20230157997A (ko) | 2023-11-17 |
CN117120636A (zh) | 2023-11-24 |
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