JP2021505765A - 冷間圧延焼鈍鋼板及びその製造方法 - Google Patents
冷間圧延焼鈍鋼板及びその製造方法 Download PDFInfo
- Publication number
- JP2021505765A JP2021505765A JP2020530691A JP2020530691A JP2021505765A JP 2021505765 A JP2021505765 A JP 2021505765A JP 2020530691 A JP2020530691 A JP 2020530691A JP 2020530691 A JP2020530691 A JP 2020530691A JP 2021505765 A JP2021505765 A JP 2021505765A
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- Prior art keywords
- steel sheet
- cold
- rolled
- treated steel
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 54
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 51
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 22
- 230000000717 retained effect Effects 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000010955 niobium Substances 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 28
- 238000000137 annealing Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 239000002244 precipitate Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910001567 cementite Inorganic materials 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- 238000001556 precipitation Methods 0.000 abstract description 6
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 9
- 230000009466 transformation Effects 0.000 description 6
- 239000011651 chromium Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- -1 zinc-nickel alloys Chemical compound 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000001887 electron backscatter diffraction Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000001540 jet deposition Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
- B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/163—Welding of coated materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/16—Resistance welding; Severing by resistance heating taking account of the properties of the material to be welded
- B23K11/163—Welding of coated materials
- B23K11/166—Welding of coated materials of galvanized or tinned materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- B32B15/013—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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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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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
- C21D6/00—Heat treatment 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/0436—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
- C21D8/04—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
-
- 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
- C21D8/0447—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- 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
- C22C38/002—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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Abstract
Description
−十分な強度を確保し、十分な伸びを得るために必要な残留オーステナイトの安定性を向上させるためには、0.03%≦C≦0.25%。好ましくは、炭素含有率は、0.1%以上である。炭素含有率が高すぎる場合、熱間圧延された鋼板を冷間圧延することが極めて困難となり、溶接性が不十分になる。炭素含有率が0.03%未満である場合、引張強さは目標値に達しない。
−十分な強度を確保し、オーステナイトの少なくとも一部を安定化させて、十分な伸びを得るためには、3.5%≦Mn≦8%。3.5%未満では、最終組織は不十分な残留オーステナイトの割合及び残留オーステナイト中の不十分なMn含有率を含み、延性及び強度の望ましい組み合わせは達成されない。最大値は、延性に有害な偏析の問題を回避するために規定される。好ましくは、マンガン含有率は、3.7%以上である。
−0.5%≦Si≦2.0%及び0.03%≦Al≦2.0%。本発明によれば、Si及びAlは共に重要な役割を果たす:ケイ素は平衡変態温度Ae3未満に冷却するとセメンタイトの析出を遅らせる。したがって、少なくとも0.5%のSi添加は、十分な量の残留オーステナイトを安定化させるのに役立つ。Siはさらに固溶体強化をもたらし、部分的なマルテンサイト変態の後に行われる即時の再加熱及び保持工程から生じる、マルテンサイトからオーステナイトへの炭素の再分配の間、炭化物の形成を遅らせる。含有率が高すぎると、表面に酸化ケイ素が形成され、鋼の被覆性が損なわれる。したがって、Si含有率は2.0%以下である。
−熱間圧延中にオーステナイト粒を微細化し、析出強化を付与するために、Nb≦0.080%を添加することができる。好ましい実施形態では、添加されるニオブの最小量は、0.010%である。添加量が0.080%を超えると、降伏強さ、伸び及び穴広げ率が所望のレベルに確保されない。
−析出強化を付与するために、Ti≦0.080%を添加することができる。好ましい実施形態では、添加されるチタンの最小量は、0.010%である。しかしながら、チタンの添加量が0.080%以上の場合、降伏強さ、伸び及び穴広げ率が所望のレベルに確保されない。
−析出強化を付与するために、V≦0.2%を添加することができる。好ましい実施形態では、添加されるバナジウムの最小量は、0.010%である。しかしながら、バナジウムの添加量が0.2%以上の場合、降伏強さ、伸び及び穴広げ率が所望のレベルに確保されない。
−0.1%≦Mo≦0.5%。モリブデンは、焼入れ性を高め、残留オーステナイトを安定化させて、分配中のオーステナイト分解を低減させ、高マンガン含有率に起因する可能性があり、穴広げ率に有害な中心偏析を低減する。さらに、Moは組織の微細化に役立つ。0.5%を超えると、Moの添加はコストがかかり、求められている特性を考慮すると非効果的である。
−炭化物の溶解を遅らせ、残留オーステナイトを安定化させるために、0.01%≦Cr≦1%。最大1%のクロムが許容され、それを超えると、飽和効果が顕著となり、クロムの添加は役に立たず、費用もかかる。
−0.0005%≦B≦0.004%。鋼の焼入れ性を高めるため。
−10%〜30%の残留オーステナイトにおいて、前記残留オーステナイトは、アスペクト比が少なくとも3のフィルムとして存在し、及び島状マルテンサイト・オーステナイト(いわゆる島状MA)として存在し、そのような島状MAの8%未満が0.5μmを超えるサイズを有し、
−最大で1%のフレッシュマルテンサイト、
−最大で50%の焼戻しマルテンサイト、
−ニオブ、チタン及びバナジウムから選択される少なくとも1つの元素の析出物を含む回復したマルテンサイトからなる組織を有する。
−焼鈍によって完全オーステナイト組織を得るために、冷間圧延鋼板をAe3〜Ae3+100℃の第1の焼鈍温度に再加熱し、30秒〜600秒に含まれる保持時間にわたって、この冷間圧延鋼板を前記焼鈍温度に維持する工程。
−冷間圧延鋼板を0.5℃/秒〜200℃/秒に含まれる冷却速度で、20℃〜Ms−50℃に含まれる焼入れ温度まで焼入れ、1〜200秒に含まれる保持時間にわたって、この冷間圧延鋼板を前記焼入れ温度に維持する工程。
−マルテンサイト中で鋼の伸びの減少をもたらすであろうイプシロン炭化物が形成されないように、2秒〜200秒、好ましくは3秒〜7秒に含まれる保持時間にわたって、焼入れした鋼板を焼入れ温度に任意選択的に保持する工程。
−冷間圧延鋼板をTΘ〜Ae3−30℃に含まれる第2の焼鈍温度に再加熱し、100秒〜2000秒に含まれる時間にわたって、この冷間圧延鋼板を前記焼鈍温度に維持する工程。
−任意選択的に、鋼板を480℃以下の温度の浴中で溶融めっきする工程。任意の種類のコーティング、特に、亜鉛、又は亜鉛−ニッケル合金、亜鉛−マグネシウム合金若しくは亜鉛−マグネシウム−アルミニウム合金のような亜鉛合金、アルミニウム、又はアルミニウム−ケイ素のようなアルミニウム合金を使用することができる。
−第2の焼鈍工程の直後、又は溶融めっき工程を行った場合には溶融めっき工程の直後に、冷間圧延熱処理鋼板を得るために、冷間圧延鋼板を室温まで冷却する工程。冷却速度は、好ましくは1℃/秒より速く、例えば、2℃/秒〜20℃/秒に含まれる。
−室温まで冷却し、任意のコーティングを行った後、170℃〜500℃に含まれる温度で、3〜1200秒に含まれる保持時間にわたって、鋼板に焼戻し処理を施す(温度が高いほど、保持時間は短くなる)。この焼戻し処理は、アスペクト比が少なくとも3のオーステナイトフィルム又は0.5μm未満のサイズの小さな島状オーステナイトを有する焼戻しマルテンサイトに変わる大きな島状MA(0.5μmを超えるサイズ)の割合を減少させることを目的としている。
−任意選択的に、室温まで冷却した後に、溶融めっき工程が行われていない場合には、鋼板は、電気化学的方法、例えば、電気亜鉛めっきによって、又はPVD若しくはジェット蒸着のような任意の真空めっき法によって、コーティングすることができる。任意の種類のコーティング、特に、亜鉛、又は亜鉛−ニッケル合金、亜鉛−マグネシウム合金若しくは亜鉛−マグネシウム−アルミニウム合金のような亜鉛合金を使用することができる。任意選択的に、電気亜鉛めっきによるコーティングの後、鋼板は脱気を施されてもよい。
試験した組成を次の表にまとめ、元素含有率を重量パーセントで表す。
鋳放しの鋼半製品を1250℃で再加熱し、熱間圧延し、次に、550℃で巻き取り、酸洗いし、5時間にわたって600℃で焼鈍し、酸洗いし、50%の圧下率で冷間圧延した。その後、次の条件で加工した。
得られた鋼板のミクロ組織の相の割合を測定した。
γアスペクト比:オーステナイトフィルムのアスペクト比を表す
MA:0.5μmを超えるサイズの島状MAの表面の割合を表す
FM:フレッシュマルテンサイトの表面の割合を表す
TM:焼戻しマルテンサイトを表す
RM:回復したマルテンサイト又は再結晶フェライトの表面の割合を表す
RF:再結晶フェライトの表面の割合を表す
RM中の析出物:回復したマルテンサイト中のNb析出物の存在を表す
試験した試料の機械的特性を測定し、次の表にまとめた。
Claims (17)
- 冷間圧延熱処理鋼板であって、前記冷間圧延熱処理鋼板が、重量パーセントで
C:0.03−0.25%
Mn:3.5−8%
Si:0.5−2.0%
Al:0.03−2.0%
Ti≦0.080%
Nb≦0.080%
V≦0.2%
V+Ti+Nb>0.01%
S≦0.010%
P≦0.020%
N≦0.008%
を含み、
任意選択的に、重量パーセントで以下の元素の1つ以上
Mo:0.1−0.5%
Cr:0.01−1%
B:0.0005−0.004%
を含み、
組成の残部は、鉄及び製錬から生じる不可避の不純物である組成を有する鋼から製造される、冷間圧延熱処理鋼板において、
前記冷間圧延鋼板は、表面の割合により、
−10%〜30%の残留オーステナイトにおいて、前記残留オーステナイトは、アスペクト比が少なくとも3のフィルムとして存在し、及び島状マルテンサイト・オーステナイトとして存在し、そのような島状マルテンサイト・オーステナイトの8%未満が0.5μmを超えるサイズを有し、
−最大で1%のフレッシュマルテンサイト、
−最大で50%の焼戻しマルテンサイト、
−ニオブ、チタン及びバナジウムから選択される少なくとも1つの元素の析出物を含む回復したマルテンサイト
からなるミクロ組織を有する、冷間圧延熱処理鋼板。 - アルミニウム含有率が、最大で1.2%である、請求項1に記載の冷間圧延熱処理鋼板。
- ニオブ含有率が、少なくとも0.010%である、請求項1又は2に記載の冷間圧延熱処理鋼板。
- 炭素含有率が、少なくとも0.10%である、請求項1〜3のいずれか一項に記載の冷間圧延熱処理鋼板。
- 0.5μmを超えるサイズを有する島状マルテンサイト・オーステナイトと前記オーステナイトフィルムとの割合の比率が、1.0未満である、請求項1〜4のいずれか一項に記載の冷間圧延熱処理鋼板。
- 0.5μmを超えるサイズを有する島状マルテンサイト・オーステナイトと前記オーステナイトフィルムとの割合の比率が、0.5未満である、請求項5に記載の冷間圧延熱処理鋼板。
- フレッシュマルテンサイトの表面の割合が、1%未満である、請求項1〜6のいずれか一項に記載の冷間圧延熱処理鋼板。
- 島状マルテンサイト・オーステナイトの5%未満が、0.5μmを超えるサイズを有する、請求項1〜7のいずれか一項に記載の冷間圧延熱処理鋼板。
- アスペクト比が3を超えるオーステナイトフィルムの表面の割合が、少なくとも5%である、請求項1〜8のいずれか一項に記載の冷間圧延熱処理鋼板。
- 冷間圧延熱処理鋼板が、Zn又はZn合金でコーティングされる、請求項1〜9のいずれか一項に記載の冷間圧延熱処理鋼板。
- 冷間圧延熱処理鋼板が、Al又はAl合金でコーティングされる、請求項1〜9のいずれか一項に記載の冷間圧延熱処理鋼板。
- 冷間圧延熱処理鋼板が、少なくとも750MPaの降伏強さYS、少なくとも1000MPaの引張強さTS、少なくとも12%の一様伸びUE及び少なくとも20%の穴広げ率HERを有する、請求項1〜11のいずれか一項に記載の冷間圧延熱処理鋼板。
- 冷間圧延熱処理鋼板の製造方法であって、前記製造方法が、以下の連続する
−スラブを得るために鋼を鋳造する工程において、前記鋼は、請求項1〜4のいずれか一項に記載の組成を有する工程と、
−前記スラブを1150℃〜1300℃に含まれる温度Treheatで再加熱する工程と、
−前記再加熱したスラブをAr3よりも高い温度で熱間圧延して、熱間圧延鋼板を得る工程と、
−前記熱間圧延鋼板を20℃〜600℃に含まれる巻き取り温度Tcoilで巻き取る工程と、
−前記熱間圧延鋼板を焼鈍して、熱間圧延焼鈍鋼板を得る工程と、
−前記熱間圧延焼鈍鋼板を冷間圧延して、冷間圧延鋼板を得る工程と、
−焼鈍によって完全オーステナイト組織を得るために、前記冷間圧延鋼板をAe3〜Ae3+100℃の第1の焼鈍温度に再加熱し、30秒〜600秒に含まれる保持時間にわたって、前記冷間圧延鋼板を前記焼鈍温度に維持する工程と、
−前記冷間圧延鋼板を0.5℃/秒〜200℃/秒に含まれる冷却速度で、20℃〜Ms−50℃に含まれる焼入れ温度まで焼入れ、1〜200秒に含まれる保持時間にわたって、前記冷間圧延鋼板を前記焼入れ温度に維持する工程と、
−前記冷間圧延鋼板をTΘ〜Ae3−30℃に含まれる第2の焼鈍温度に再加熱し、TΘは、それを超えるとセメンタイトが加熱により溶解する温度を示し、100秒〜2000秒に含まれる時間にわたって、前記冷間圧延鋼板を前記焼鈍温度に維持する工程と、
−前記冷間圧延鋼板を室温まで冷却する工程と、
−前記冷間圧延鋼板を170℃〜500℃に含まれる温度で、3〜1200秒に含まれる保持時間にわたって焼戻し、冷間圧延熱処理鋼板を得る工程と
を含む、製造方法。 - 熱間圧延鋼板に対して行われる焼鈍が、500℃〜680℃に含まれる温度で、1000秒〜50000秒の間に行われるバッチ焼鈍である、請求項13に記載の方法。
- 前記冷間圧延鋼板の加熱速度が、1〜200℃/秒に含まれる、請求項13又は14のいずれか一項に記載の方法。
- 少なくとも2枚の鋼板のスポット溶接継手の製造方法であって、以下の
−請求項1〜12のいずれか一項に記載の冷間圧延熱処理鋼板、又は請求項13〜15のいずれか一項に記載の方法により製造された冷間圧延熱処理鋼板を提供する工程と、
−第2の鋼板を提供する工程と、
−前記冷間圧延熱処理鋼板を前記第2の鋼板にスポット溶接する工程と
を含む、製造方法。 - 第2の鋼板が、請求項1〜12のいずれか一項に記載の冷間圧延熱処理鋼板、又は請求項13〜15のいずれか一項に記載の方法により製造された冷間圧延熱処理鋼板である、請求項16に記載の方法。
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