JP2021503040A - 平鋼製品およびその製造方法 - Google Patents
平鋼製品およびその製造方法 Download PDFInfo
- Publication number
- JP2021503040A JP2021503040A JP2020517460A JP2020517460A JP2021503040A JP 2021503040 A JP2021503040 A JP 2021503040A JP 2020517460 A JP2020517460 A JP 2020517460A JP 2020517460 A JP2020517460 A JP 2020517460A JP 2021503040 A JP2021503040 A JP 2021503040A
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- JP
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- Prior art keywords
- flat steel
- steel product
- temperature
- weight
- martensite
- 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 185
- 239000010959 steel Substances 0.000 title claims abstract description 185
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 87
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 51
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000005097 cold rolling Methods 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 27
- 230000000717 retained effect Effects 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 19
- 230000009466 transformation Effects 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 3
- 238000005536 corrosion prevention Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 102
- 238000000137 annealing Methods 0.000 description 24
- 238000010791 quenching Methods 0.000 description 23
- 230000000171 quenching effect Effects 0.000 description 23
- 230000000694 effects Effects 0.000 description 20
- 239000011572 manganese Substances 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 16
- 238000005192 partition Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 239000002244 precipitate Substances 0.000 description 11
- 230000006641 stabilisation Effects 0.000 description 11
- 238000011105 stabilization Methods 0.000 description 11
- 229910001567 cementite Inorganic materials 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 238000009826 distribution Methods 0.000 description 8
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010562 histological examination Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910021398 atomic carbon Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- -1 silicon Chemical compound 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000036962 time dependent Effects 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/22—Martempering
-
- 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
-
- 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
- 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
- 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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- 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
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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
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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
- C22C38/06—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
-
- 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
- C23C2/29—Cooling or quenching
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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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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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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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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Abstract
Description
0.1〜0.5%のC、
1.0〜3.0%のMn、
0.5〜2.0%のSi、
0.01〜1.5%のAl、
0.001〜0.008%のN、
最大0.02%のP、
最大0.005%のS
ならびに任意に次の元素の1つまたは複数:
0.01〜1.0%のCr、
0.01〜0.2%のMo、
0.001〜0.01%のB
ならびに任意に合計で0.005〜0.2%のV、TiおよびNb(ここで、Ti割合は0.10%以下である)、および残部として鉄と不可避的不純物からなる鋼からなり、ここで、平鋼製品は、
15面積%以下のフェライト、
5面積%以下のベイナイト、
少なくとも5体積%の残留オーステナイトおよび
少なくとも80面積%のマルテンサイトであって、そのうち少なくとも75面積%が焼戻しマルテンサイトであるマルテンサイト
からなる組織を有する。
%Si+0.5*%Al≧0.9重量%
式中
%Si:重量%での鋼のそれぞれのSi含有量
%Al:重量%での鋼のそれぞれのAl含有量。
a)鉄と不可避的不純物の他に、(重量%で)0.1〜0.5%のC、1.0〜3.0%のMn、0.5〜2.0%のSi、0.01〜1.5%のAl、0.001〜0.008%のN、最大0.02%のP、最大0.005%のSならびに任意に次の元素の1つまたは複数:0.01〜1.0%のCr、0.01〜0.2%のMo、0.001〜0.01%のBならびに任意に合計で0.005〜0.2%のV、TiおよびNbからなる鋼からなり、ここで、Ti含有量は0.10%以下である、熱間圧延平鋼製品を準備する工程;
b)熱間圧延平鋼製品を酸洗する工程;
c)少なくとも37%の冷間圧延率で平鋼製品を冷間圧延する工程;
d)冷間圧延平鋼製品を、鋼のA3温度よりも高く、最大でも950℃である保持ゾーン温度THZに加熱し、ここで、5〜50K/秒の加熱速度θH1で200〜400℃の変態点温度TWまで加熱し、2〜10K/秒の加熱速度θH2で変態点温度TWよりも高い温度に加熱する工程;
e)平鋼製品を保持ゾーン温度THZで5〜15秒間保持する工程;
f)任意に、平鋼製品を、保持ゾーン温度THZから少なくとも620℃かつ最大でも720℃の中間温度TLKに30〜300秒以内に冷却する工程;
g)平鋼製品を平均5K/秒を超える冷却速度θQで、マルテンサイト開始温度TMSとTMSよりも最大175℃低い温度との間にある冷却停止温度TABに冷却する工程;
h)平鋼製品を冷却停止温度TABで10〜60秒間保持する工程;
i)平鋼製品を1〜80K/秒の加熱速度θB1で350〜500℃の処理温度TBに加熱し、任意に平鋼製品を処理温度TBに等温保持し、ここで、加熱と任意の等温保持の時間が合わせて10〜1000秒である工程;
j)平鋼製品を5K/秒超500K/秒未満の冷却速度θB2で室温に冷却する工程;
k)任意に、平鋼製品を溶融浴で
k1)作業工程j)での冷却前に溶融浸漬コーティングによりコーティングする工程、
または
k2)作業工程j)での冷却後に電解コーティングによりコーティングする工程。
KWG=(h0−h1)/h0
式中、h0は冷間圧延前の平鋼製品の厚み(mm)であり、h1は冷間圧延後の平鋼製品の厚み(mm)である。平鋼製品が、酸洗後かつ作業工程d)での加熱前に複数の冷間圧延プロセスまたは冷間圧延工程を経る場合、KWGは総冷間圧延率に基づいており、すなわち、h0は最初の冷間圧延プロセス前または冷間圧延工程前の平鋼製品の厚み(mm)であり、h1は最後の冷間圧延プロセス後または冷間圧延工程後の平鋼製品の厚み(mm)である。少なくとも37%のKWGでの冷間圧延によって、機械的均質化だけでなく、粒度の減少ひいては細粒組織も設定される。高度の冷間圧延率ならびに析出プロセスおよびその結果生じる焼鈍前の微細な初期組織に基づき、冷却前に非常に細粒のオーステナイト組織が早くも存在することになる。この場合、結晶粒界は、マルテンサイトラスの成長に対する障害として機能し、微細組織における結晶粒界間の距離が短ければ、より短くてより狭いラスがもたらされる。急冷すると、残留オーステナイトが間に埋め込まれた超微細なマルテンサイトラスの組織が形成される。これにより、その後の処理工程では拡散経路が短くなり、そうして残留オーステナイトの局所安定化が可能になる。
A3[℃]=910−203*√%C−15.2%Ni+44.7%Si+31.5%Mo−21.1%Mn
式中、%C=重量%での鋼のC含有量、%Ni=重量%での鋼のNi含有量、%Si=重量%での鋼のSi含有量、%Mo=重量%での鋼のMo含有量、%Mn=重量%での鋼のMn含有量。
TMS[℃]=539℃+(−423%C−30.4%Mn−7.5%Si+30%Al)℃/重量%
式中、%C=重量%での鋼のC含有量、%Mn=重量%での鋼のMn含有量、%Si=重量%での鋼のSi含有量、%Al=重量%での鋼のAl含有量。
Claims (15)
- 焼付硬化処理に適した超高強度の平鋼製品であって、(重量%で)鉄と不可避的不純物の他に、
C:0.1〜0.5%、
Si:0.5〜2.0%、
Mn:1.0〜3.0%、
Al:0.01〜1.5%、
N:0.001〜0.008%、
P:0.02%以下、
S:0.005%以下
ならびに任意に次の元素の1つまたは複数:
Cr:0.01〜1.0%、
Mo:0.01〜0.2%、
B:0.001〜0.01%
ならびに任意に合計で0.005〜0.2%のV、TiおよびNb
からなる鋼からなり、ここで、Ti割合は0.10%以下であり、ここで、前記平鋼製品は、
15面積%以下のフェライト、
5面積%以下のベイナイト、
少なくとも5体積%の残留オーステナイトおよび
少なくとも80面積%のマルテンサイトであって、そのうち少なくとも75面積%が焼戻しマルテンサイトであるマルテンサイト
からなる組織を有し、ここで、前記組織内のマルテンサイトの総割合に関して、これは、前記マルテンサイトの少なくとも90%について、最大でも7.5μmのマルテンサイトラス長さと、最大でも1000nmマルテンサイトラス幅とを有する、平鋼製品。 - 炭素含有量が少なくとも0.14重量%であることを特徴とする、請求項1に記載の平鋼製品。
- Si含有量とAl含有量の半分との合計が少なくとも0.9重量%であることを特徴とする、請求項1または2に記載の平鋼製品。
- Si含有量が少なくとも0.5重量%であることを特徴とする、請求項1から3のいずれか一項に記載の平鋼製品。
- Si含有量が少なくとも0.9重量%であることを特徴とする、請求項1から4のいずれか一項に記載の平鋼製品。
- 前記平鋼製品の前記鋼のAl含有量が少なくとも0.02重量%であることを特徴とする、請求項1から5のいずれか一項に記載の平鋼製品。
- 前記平鋼製品の前記鋼のAl含有量が少なくとも0.2重量%であることを特徴とする、請求項1から6のいずれか一項に記載の平鋼製品。
- 700MPaを超える耐力Rp0.2または700MPaを超える降伏点ReH、950〜1500MPaの引張強度Rm、7〜25%の伸び率A80、ならびに2%の予変形およびDIN EN 10325:2006に従った170℃で20分間の焼戻し後に決定される、少なくとも80MPaのBH2値を有することを特徴とする、請求項1から7のいずれか一項に記載の平鋼製品。
- 少なくとも片側に亜鉛系腐食防止コーティングが設けられていることを特徴とする、請求項1から8のいずれか一項に記載の平鋼製品。
- 焼付硬化処理に適した超高強度の平鋼製品を製造するための方法であって、次の作業工程:
a)鉄と不可避的不純物の他に、(重量%で)0.1〜0.5%のC、1.0〜3.0%のMn、0.5〜2.0%のSi、0.01〜1.5%のAl、0.001〜0.008%のN、最大0.02%のP、最大0.005%のSならびに任意に次の元素の1つまたは複数:0.01〜1.0%のCr、0.01〜0.2%のMo、0.001〜0.01%のBならびに任意に合計で0.005〜0.2%のV、TiおよびNbからなる鋼からなり、ここで、Ti含有量は0.10%以下である、熱間圧延平鋼製品を準備する工程;
b)前記熱間圧延平鋼製品を酸洗する工程;
c)少なくとも37%の冷間圧延率で前記平鋼製品を冷間圧延する工程;
d)前記冷間圧延平鋼製品を、前記鋼のA3温度よりも高く、最大でも950℃である保持ゾーン温度THZに加熱し、ここで、5〜50K/秒の加熱速度θH1で200〜400℃の変態点温度TWまで加熱し、2〜10K/秒の加熱速度θH2で変態点温度TWよりも高い温度に加熱する工程;
e)前記平鋼製品を前記保持ゾーン温度THZで5〜15秒間保持する工程;
f)任意に、前記平鋼製品を、前記保持ゾーン温度THZから少なくとも620℃かつ最大でも720℃の中間温度TLKに30〜300秒以内に冷却する工程;
g)前記平鋼製品を平均5K/秒を超える冷却速度θQで、マルテンサイト開始温度TMSとTMSよりも最大175℃低い温度との間にある冷却停止温度TABに冷却する工程;
h)前記平鋼製品を前記冷却停止温度TABで10〜60秒間保持する工程;
i)前記平鋼製品を1〜80K/秒の加熱速度θB1で350〜500℃の処理温度TBに加熱し、任意に前記平鋼製品を前記処理温度TBに等温保持し、ここで、前記加熱と前記任意の等温保持の時間が合わせて10〜1000秒である工程;
j)前記平鋼製品を5K/秒超500K/秒未満の冷却速度θB2で室温に冷却する工程;
k)任意に、前記平鋼製品を溶融浴で
k1)作業工程j)での前記冷却前に溶融浸漬コーティングによりコーティングする工程、
または
k2)作業工程j)での前記冷却後に電解コーティングによりコーティングする工程
を含む、方法。 - 作業工程c)での前記冷間圧延率が少なくとも42%であることを特徴とする、請求項10に記載の方法。
- 前記平鋼製品が、作業工程k)で亜鉛系溶融浴を通過することを特徴とする、請求項10または11に記載の方法。
- 作業工程k)での前記溶融浴組成物が、1〜2重量%のAl、1〜2重量%のMg、残部の亜鉛と不可避的不純物からなることを特徴とする、請求項12に記載の方法。
- 作業工程k)での前記任意のコーティング処理が連続フローで行われることを特徴とする、請求項10から13のいずれか一項に記載の方法。
- 作業工程j)での前記冷却速度θB2が20K/秒を超えることを特徴とする、請求項10から14のいずれか一項に記載の方法。
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JP7105302B2 (ja) | 2022-07-22 |
CN111148853A (zh) | 2020-05-12 |
EP4043603A1 (de) | 2022-08-17 |
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