JP6830539B2 - 高強度高成形性の冷間圧延熱処理鋼板及び製造方法 - Google Patents
高強度高成形性の冷間圧延熱処理鋼板及び製造方法 Download PDFInfo
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- JP6830539B2 JP6830539B2 JP2019536660A JP2019536660A JP6830539B2 JP 6830539 B2 JP6830539 B2 JP 6830539B2 JP 2019536660 A JP2019536660 A JP 2019536660A JP 2019536660 A JP2019536660 A JP 2019536660A JP 6830539 B2 JP6830539 B2 JP 6830539B2
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- cold
- steel sheet
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- austenite
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- 229910000831 Steel Inorganic materials 0.000 title claims description 151
- 239000010959 steel Substances 0.000 title claims description 151
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 229910001566 austenite Inorganic materials 0.000 claims description 109
- 238000000137 annealing Methods 0.000 claims description 80
- 229910052799 carbon Inorganic materials 0.000 claims description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 55
- 229910000734 martensite Inorganic materials 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 36
- 239000010960 cold rolled steel Substances 0.000 claims description 34
- 238000010791 quenching Methods 0.000 claims description 26
- 230000000171 quenching effect Effects 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 21
- 150000001247 metal acetylides Chemical class 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 21
- 230000000717 retained effect Effects 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 238000002848 electrochemical method Methods 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 239000011572 manganese Substances 0.000 description 131
- 229910052748 manganese Inorganic materials 0.000 description 19
- 239000011651 chromium Substances 0.000 description 16
- 229910001567 cementite Inorganic materials 0.000 description 15
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 15
- 239000000047 product Substances 0.000 description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 9
- 230000009466 transformation Effects 0.000 description 9
- 239000010955 niobium Substances 0.000 description 8
- 239000010936 titanium Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 230000008719 thickening Effects 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- -1 zinc-nickel alloys Chemical compound 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000001627 detrimental effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 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
- 230000001934 delay Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001887 electron backscatter diffraction Methods 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000000691 measurement method 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
- 238000005096 rolling process Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 230000002747 voluntary effect Effects 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 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
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001540 jet deposition Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- 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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- 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
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- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
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- 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
- 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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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—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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- 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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- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C—ALLOYS
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
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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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Heat Treatment Of Steel (AREA)
Description
特に使用される試験片の幾何学的形状の違いにより、ISO規格による全伸びTEの値は、JIS Z2201−05規格に従った試験片を使用するJIS Z2241規格に従って測定された全伸びの値とは著しく異なり、特にJIS Z2241規格に従って測定された全伸びの値よりも低い。穴広げ率(HER)は、ISO規格16630:2009に従って測定される。測定方法の違いのために、ISO規格16630:2009による穴広げ率(HER)の値は、JFS T1001(日本鋼鉄連盟の規格)に従った穴広げ率λの値とは非常に異なり、JFS T1001に従った穴広げ率λの値に匹敵しない。
0.10%≦C≦0.40%
3.5%≦Mn≦8.0%
0.5%≦Si≦2.5%
0.003%≦Al≦3.0%
Si+Al≧0.8%
0.001%≦Mo≦0.5%
S≦0.010%
P≦0.020%
N≦0.008%
を含み、任意選択的にCr、Ti、Nb、V及びBの中から選択される1つ以上の元素を、
0.01%≦Cr≦2.0%
0.010%≦Ti≦0.080%
0.010%≦Nb≦0.080%
0.010%≦V≦0.30%
0.0005%≦B≦0.003%
となるように含み、
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し、
該冷間圧延鋼板は、表面分率で、10%〜50%の間の残留オーステナイト、最大8%のフレッシュマルテンサイト、及び焼戻しマルテンサイトからなる微細構造を有し、該残留オーステナイトは、
−Mn含有率が1.3*Mn%より高いMn富化オーステナイト、ここでMn%は鋼板のMn含有率を表し、
−Mn含有率が0.5*Mn%〜1.3*Mn%の間に含まれるMnが少ないオーステナイトを含み、
微細構造全体に対する該Mn富化オーステナイトの表面分率は、2%〜12%の間である、冷間圧延熱処理鋼板に関する。
C≧0.15%
C≦0.30%
−鋼を鋳造してスラブを得る工程、ここで鋼は重量パーセントで、
0.10%≦C≦0.40%
3.5%≦Mn≦8.0%
0.5%≦Si≦2.5%
0.003%≦Al≦3.0%
Si+Al≧0.8%
0.001%≦Mo≦0.5%
S≦0.010%
P≦0.020%
N≦0.008%
を含み、任意選択的にCr、Ti、Nb、V及びBの中から選択される1つ以上の元素を、
0.01%≦Cr≦2.0%
0.010%≦Ti≦0.080%
0.010%≦Nb≦0.080%
0.010%≦V≦0.30%
0.0005%≦B≦0.003%
となるように、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し、
−スラブを1150℃〜1300℃の間に含まれる温度Treheatで再加熱する工程、
−再加熱されたスラブをAr3より高い温度で熱間圧延して、熱間圧延鋼を得る工程、
−熱間圧延鋼を20℃〜600℃の間に含まれる温度で巻き取る工程、
−熱間圧延鋼をAc1−20℃より低い温度THBAで、以下のように定義される最小バッチ焼鈍時間tHBAmin以上である時間tHBAの間焼鈍する工程、
− 鋼を冷間圧延して冷間圧延鋼板を得る工程、
− 冷間圧延鋼板をAe3〜Ae3+150℃の間に含まれる焼鈍温度TAまで再加熱して、焼鈍時にオーステナイトからなる構造を得、冷間圧延鋼板をtAmin〜tAmaxの間に含まれる保持時間tAの間、焼鈍温度TAに維持する工程、ここでtAmin及びtAmaxは以下のように定義される、
−冷却時にフェライト及びパーライトの形成を回避するのに十分に速い冷却速度で、冷間圧延鋼板をMf+20℃〜Ms−50℃の間に含まれる焼き入れ温度QTまで焼き入れする工程、
−冷間圧延鋼板を350℃〜500℃の間に含まれる炭素濃化温度TPに再加熱し、冷間圧延鋼板を3秒〜1000秒の間に含まれる炭素濃化時間tPの間、該炭素濃化温度TPに維持する工程、
−冷間圧延鋼板を室温まで冷却し、冷間圧延熱処理鋼板を得る工程
を含む冷間圧延熱処理鋼板を製造するための方法に関する。
−1.3×Mn%より高いMn含有率を有するMn富化オーステナイト、ここでMn%は鋼板のMn含有率を表す、
−0.5×Mn%〜1.3×Mn%の間に含まれるMn含有率を有する、Mnが少ないオーステナイト
を含み、微細構造全体に対するMn富化オーステナイトの表面分率は、2%〜12%の間である。
C≧0.15%
C≦0.30%
−本発明による冷間圧延熱処理鋼板、又は本発明による方法によって製造された冷間圧延熱処理鋼板を提供する工程、
−第2の鋼板を提供する工程、
−冷間圧延熱処理鋼板を第2の鋼板に抵抗スポット溶接する工程
を含む少なくとも2枚の鋼板の抵抗スポット溶接継手を製造するための方法に関する。
−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改善するために、0.10%≦C≦0.40%。好ましくは、炭素含有率は0.10%以上、さらに好ましくは0.15%以上である。好ましくは、炭素含有率は0.30%以下である。炭素含有率が高すぎると、熱間圧延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0.10%未満であると、引張強度は目標値に達しない。さらに好ましくは、炭素含有率は0.20%以下である。
−十分な伸びを得るために、十分な強度を確保し、少なくとも一部のオーステナイトの安定化を達成するために、3.5%≦Mn≦8.0%。特に、最小値は、表面分率で、鋼のMn含有率を表すMn含有率が1.3×Mn%よりも高い、2%〜12%のMn富化オーステナイトを含む最終構造を得るために規定される。最大値は、延性にとって有害である偏析問題を避け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。第一の実施態様によれば、マンガン含有率は3.5%〜6.0%の間、好ましくは3.7%〜6.0%の間に含まれる。第2の実施形態によれば、マンガン含有量は6.0%〜8.0%の間に含まれる。他の実施形態によれば、マンガン含有量は3.5%〜4.0%の間に含まれる。
−0.5%≦Si≦2.5%及び0.003%≦Al≦3.0%のアルミニウム、ケイ素含有率及びアルミニウム含有率はさらに以下の関係、すなわちSi+Al≧0.8%を満たす。
−焼鈍時にオーステナイトからなる構造を得るために、冷間圧延鋼板をAe3〜Ae3+150℃の間に含まれる焼鈍温度TAまで再加熱し、冷間圧延鋼板を保持時間tAの間焼鈍温度TAに維持する工程を含む。
−10%〜50%の残留オーステナイト
−最大8%のフレッシュマルテンサイト及び
−焼戻しマルテンサイト
−1.3*Mn%より高いMn含有率を有するMn富化オーステナイト、微細構造全体に対するMn富化オーステナイトの表面分率は、2%〜12%である。
−0.5*Mn%〜1.3*Mn%の間に含まれるMn含有率を有するMnが少ないオーステナイト。Mnが少ないオーステナイトの表面分率は、好ましくは少なくとも5%である。
Claims (24)
- 冷間圧延熱処理鋼板であって、重量%で
0.10%≦C≦0.40%
3.5%≦Mn≦8.0%
0.5%≦Si≦2.5%
0.003%≦Al≦3.0%
Si+Al≧0.8%
0.001%≦Mo≦0.5%
S≦0.010%
P≦0.020%
N≦0.008%
を、
任意選択的にCr、Ti、Nb、V及びBの中から選択される1つ以上の元素を、
0.01%≦Cr≦2.0%
0.010%≦Ti≦0.080%
0.010%≦Nb≦0.080%
0.010%≦V≦0.30%
0.0005%≦B≦0.003%
であるように含み、
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し、
該冷間圧延鋼板は、面積分率で、10%〜50%の間の残留オーステナイト、最大8%のフレッシュマルテンサイト、及び焼戻しマルテンサイトからなる微細構造を有し、該残留オーステナイトは、
−Mn含有率が1.3*Mn%より高いMn富化オーステナイト、ここでMn%は鋼板のMn含有率を表し、
−Mn含有率が0.5*Mn%〜1.3*Mn%の間に含まれるMnが少ないオーステナイトを含み、
該微細構造全体に対する該Mn富化オーステナイトの面積分率は、2%〜12%の間である、冷間圧延熱処理鋼板。 - 前記Mnが少ないオーステナイト及び前記Mn富化オーステナイトが、0.4%〜1.0%の間に含まれる平均C含有率を有する、請求項1に記載の冷間圧延熱処理鋼板。
- 前記Mn富化オーステナイトが島の形状であり、前記Mn富化オーステナイトの島の平均サイズは500nm未満である、請求項1又は2に記載の冷間圧延熱処理鋼板。
- 前記フレッシュマルテンサイト及び前記焼戻しマルテンサイトが炭化物を含み、その最大寸法が60nmより大きい炭化物の面積密度は4×106/mm2以下である、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。
- 1100MPa〜1700MPaの間に含まれる降伏強度YS、1300MPa〜2000MPaの間に含まれる引張強度TS、少なくとも10%の一様伸びUE、ISO規格ISO6892−1に従って測定された少なくとも13%の全伸びTE、少なくとも19000MPa%の製品引張強度×全伸び(TS×TE)、少なくとも13000MPa%の製品降伏強度×一様伸び(YS×UE)、及びISO規格16630:2009に従って測定された少なくとも20%の穴広げ率HERを有する、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。
- Zn又はZn合金で被覆される、請求項1〜5のいずれか一項に記載の冷間圧延熱処理鋼板。
- Al又はAl合金で被覆される、請求項1〜5のいずれか一項に記載の冷間圧延熱処理鋼板。
- 前記組成が、以下の条件のうちの少なくとも1つを満たす、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。
C≧0.15%
C≦0.30% - Mn≧3.7%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。
- 少なくとも2枚の鋼板の抵抗スポット溶接継手であって、該2枚の鋼板のうちの少なくとも1枚は、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である抵抗スポット溶接継手。
- 溶接後熱処理の前に少なくとも30*10N/mm2のアルファ値を有する、請求項10に記載の抵抗スポット溶接継手。
- 溶接後熱処理の後に少なくとも50*10N/mm2のアルファ値を有する、請求項10又は11に記載の抵抗スポット溶接継手。
- 冷間圧延熱処理鋼板を製造するための方法であって、以下の連続する工程
−鋼を鋳造してスラブを得る工程、ここで鋼は重量パーセントで
0.10%≦C≦0.40%
3.5%≦Mn≦8.0%
0.5%≦Si≦2.5%
0.003%≦Al≦3.0%
Si+Al≧0.8%
0.001%≦Mo≦0.5%
S≦0.010%
P≦0.020%
N≦0.008%
を、
任意選択的にCr、Ti、Nb、V及びBの中から選択される1つ以上の元素を、
0.01%≦Cr≦2.0%
0.010%≦Ti≦0.080%
0.010%≦Nb≦0.080%
0.010%≦V≦0.30%
0.0005%≦B≦0.003%
であるように含み、
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し、
−該スラブを1150℃〜1300℃の間に含まれる温度Treheatで再加熱する工程、
−該再加熱されたスラブをAr3より高い温度で熱間圧延して、熱間圧延鋼を得る工程、
−該熱間圧延鋼を20℃〜600℃の間に含まれる温度で巻き取る工程、
−該熱間圧延鋼を500℃以上Ac1−20℃未満の温度THBAで、以下のように定義される最小バッチ焼鈍時間tHBAmin以上である時間tHBAの間焼鈍する工程、
−該熱間圧延鋼を冷間圧延して冷間圧延鋼板を得る工程、
−該冷間圧延鋼板をAe3〜Ae3+150℃の間に含まれる焼鈍温度TAまで再加熱して、焼鈍時にオーステナイトからなる構造を得、冷間圧延鋼板をtAmin〜tAmaxの間に含まれる保持時間tAの間、焼鈍温度TAに維持する工程、ここでtAmin及びtAmaxは以下のように定義される、
−冷却時にフェライト及びパーライトの形成を回避するのに十分に速い冷却速度で、冷間圧延鋼板をMf+20℃〜Ms−50℃の間に含まれる焼き入れ温度QTまで焼き入れする工程、
−該冷間圧延鋼板を350℃〜500℃の間に含まれる炭素濃化温度TPに再加熱し、該冷間圧延鋼板を3秒〜1000秒の間に含まれる炭素濃化時間tPの間、該炭素濃化温度TPに維持する工程、
−該冷間圧延鋼板を室温まで冷却し、冷間圧延熱処理鋼板を得る工程
を含み、
前記冷間圧延熱処理鋼板が、面積分率で、10%〜50%の残留オーステナイト、最大で8%のフレッシュマルテンサイト、及び焼き戻しマルテンサイトからなる微細構造を有し、
該残留オーステナイトは、
−Mn含有率が1.3*Mn%より高いMn富化オーステナイト、ここでMn%は鋼板のMn含有率を表し、
−Mn含有率が0.5*Mn%〜1.3*Mn%の間に含まれるMnが少ないオーステナイト
を含み、該微細構造全体に対する該Mn富化オーステナイトの面積分率は、2%〜12%の間である、
方法。 - 前記冷間圧延鋼板を前記焼き入れ温度QTに焼き入れした後かつ前記板を前記炭素濃化温度TPに加熱する前に、2秒〜200秒の間に含まれる保持時間の間、前記冷間圧延鋼板を前記焼き入れ温度QTに保持する、請求項13に記載の方法。
- 前記冷間圧延鋼板を前記焼き入れ温度QTに焼き入れした後かつ前記板を前記炭素濃化温度TPに加熱する前に、3秒〜7秒の間に含まれる保持時間の間、前記冷間圧延鋼板を前記焼き入れ温度QTに保持する、請求項14に記載の方法。
- 前記冷間圧延鋼板を前記炭素濃化温度TPに維持することから前記冷間圧延鋼板を室温まで冷却することの間に、前記鋼板を480℃以下の温度の浴中で溶融めっきする、請求項13〜15のいずれか一項に記載の方法。
- 前記冷間圧延板を前記炭素濃化温度TPに維持した後、前記冷間圧延板を直ちに室温まで冷却する、請求項13〜15のいずれか一項に記載の方法。
- 前記冷間圧延鋼板を室温まで冷却する工程の後、電気化学的方法又は真空めっき法によって、前記冷間圧延熱処理鋼板を被覆する、請求項17に記載の方法。
- 前記冷間圧延熱処理鋼板が、Zn又はZn合金で被覆される、請求項16又は18のいずれか一項に記載の方法。
- 前記冷間圧延熱処理鋼板が、Al又はAl合金で被覆される、請求項16又は18のいずれか一項に記載の方法。
- 前記組成が、以下の条件のうちの少なくとも1つを満たす、請求項13〜20のいずれか一項に記載の方法。
C≧0.15%
C≦0.30% - Mn≧3.7%である、請求項13〜21のいずれか一項に記載の方法。
- 請求項10〜12のいずれか一項に記載の抵抗スポット溶接継手を製造するための方法であって、以下の工程
−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を提供する工程、
−第2の鋼板を提供する工程、
−該冷間圧延熱処理鋼板を該第2の鋼板に抵抗スポット溶接する工程
を含む方法。 - 前記第2の鋼板が、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である、請求項23に記載の方法。
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PCT/EP2017/073337 WO2018054787A1 (en) | 2016-09-22 | 2017-09-15 | High strength and high formability cold-rolled and heat-treated steel sheet and manufacturing method |
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