JP6668323B2 - 溶融亜鉛系コーティングを有する高強度高成形性帯鋼 - Google Patents
溶融亜鉛系コーティングを有する高強度高成形性帯鋼 Download PDFInfo
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- JP6668323B2 JP6668323B2 JP2017500846A JP2017500846A JP6668323B2 JP 6668323 B2 JP6668323 B2 JP 6668323B2 JP 2017500846 A JP2017500846 A JP 2017500846A JP 2017500846 A JP2017500846 A JP 2017500846A JP 6668323 B2 JP6668323 B2 JP 6668323B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 54
- 239000010959 steel Substances 0.000 title claims description 54
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 43
- 239000011701 zinc Substances 0.000 title claims description 43
- 229910052725 zinc Inorganic materials 0.000 title claims description 43
- 239000011248 coating agent Substances 0.000 title claims description 22
- 238000000576 coating method Methods 0.000 title claims description 22
- 238000001816 cooling Methods 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 19
- 229910001566 austenite Inorganic materials 0.000 claims description 16
- 229910001563 bainite Inorganic materials 0.000 claims description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims description 15
- 229910000734 martensite Inorganic materials 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000000717 retained effect Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910001567 cementite Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 4
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 description 23
- 230000009466 transformation Effects 0.000 description 19
- 230000015572 biosynthetic process Effects 0.000 description 14
- 239000000047 product Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000007747 plating Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 238000000137 annealing Methods 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 7
- 238000005246 galvanizing Methods 0.000 description 7
- 238000005098 hot rolling Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 6
- 238000011105 stabilization Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000003303 reheating Methods 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000010301 surface-oxidation reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- -1 hydrogen ions Chemical class 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000007573 shrinkage measurement Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/02—Alloys based on zinc with copper as the next major constituent
-
- 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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C23C2/34—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
-
- 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
-
- 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
- C21D2211/003—Cementite
-
- 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
-
- 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
- C21D2211/009—Pearlite
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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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Description
C:0.17〜0.24
Mn:1.8〜2.5
Si:0.65〜1.25
Al:0.3以下
場合により、Nb:0.1以下および/またはV:0.3以下および/またはTi:0.15以下および/またはCr:0.5以下および/またはMo:0.3以下
残部:鉄および不可避的不純物
を有し、
Si/Mn比が0.5以下かつSi/C比が3.0以上であり、
重量%で、ME=Mn+Cr+2Moで表されるMn当量MEが3.5以下であり、
体積%で、
フェライト:0〜40
ベイナイト:20〜70
マルテンサイト:7〜30
残留オーステナイト:5〜20
パーライト:2以下
セメンタイト:1以下
を含むミクロ組織を有し、
960〜1100MPaの範囲の引張強度、少なくとも500MPaの降伏強度、および、少なくとも12%の一様伸びを有する、前記帯鋼が提供される。
1)重量%で、下記組成:
C:0.17〜0.24
Mn:1.8〜2.5
Si:0.65−1.25
Al:0.3以下
場合により、Nb:0.1以下および/またはV:0.3以下および/またはTi:0.15以下および/またはCr:0.5以下および/またはMo:0.3以下
残部:鉄および不可避的不純物
を有し、
Si/Mn比が0.5以下かつSi/C比が3.0以上であり、
重量%で、ME=Mn+Cr+2Moで表されるMn当量MEが3.5以下である帯鋼を準備するステップ、
2)(Ac3+20)〜(Ac3−30)の範囲の温度T1(℃)まで前記帯鋼を加熱して完全オーステナイトミクロ組織または部分オーステナイトミクロ組織を形成するステップ、
3)620〜680℃の範囲の温度T2まで2〜4℃/秒の範囲の冷却速度で前記帯鋼を徐冷するステップ、
4)(Ms−20)〜(Ms+100)の範囲の温度T3(℃)まで25〜50℃/秒の範囲の冷却速度で前記帯鋼を急冷するステップ、
5)30〜220秒の時間にわたって420〜550℃の範囲の固定温度または徐冷温度T4で前記帯鋼を保持するステップ、
6)亜鉛浴中で前記帯鋼を溶融めっきして亜鉛系コーティングを有する前記帯鋼を提供するステップ、
7)300℃より低い温度まで少なくとも5℃/秒の冷却速度で前記コーティングされた帯鋼を冷却するステップ
を含んでなる、前記方法が提供される。
変態区間内フェライト:最大で30(この上限を超えると最終的ミクロ組織は充分なベイナイトおよび/またはマルテンサイトを含まず、したがって強度が低すぎることになる。)、
再変態フェライト:最大で40(この上限を超えると最終的ミクロ組織は充分なベイナイトおよび/またはマルテンサイトを含まず、したがって強度が低すぎることになる。)、
ベイナイト:20〜70(その下限未満では不充分なオーステナイト安定化が存在することになる。その上限を超えると不充分なマルテンサイトが存在し、したがって強度が低すぎることになる。)、
マルテンサイト:7〜30(この下限未満ではDP引張応答(引っ張られたときのDP鋼のような加工硬化)が不充分である。その上限を超えると強度が高すぎることになる。)、
残留オーステナイト:5〜20(5体積%未満では所望のレベルの展延性および/または一様伸びが達成されないことになる。その上限は組成によって決まる。)
を含んでなる。
参照文献2:S.M.C. Van Bohemen, Scr. Mater. 75 (2014) 22-25.
参照文献3:S.M.C. van Bohemen, Mater. Sci. and Technol. 28 (2012) 487-495.
Claims (15)
- 溶融亜鉛系コーティングを有する帯鋼であって、重量%で、下記組成:
C:0.17〜0.24
Mn:1.8〜2.5
Si:0.65〜1.25
Al:0.3以下
場合により、Nb:0.1以下および/またはV:0.3以下および/またはTi:0.15以下および/またはCr:0.5以下および/またはMo:0.3以下
残部:鉄および不可避的不純物
を有し、
Si/Mn比が0.5以下かつSi/C比が3.0以上であり、
重量%で、ME=Mn+Cr+2Moで表されるMn当量MEが3.5以下であり、
体積%で、
フェライト:0〜40
ベイナイト:20〜70
マルテンサイト:7〜30
残留オーステナイト:5〜20
パーライト:2以下
セメンタイト:1以下
を含むミクロ組織を有し、
960〜1100MPaの範囲の引張強度、少なくとも500MPaの降伏強度、および、少なくとも12%の一様伸びを有する、前記帯鋼。 - Cが0.18〜0.22である、請求項1に記載の帯鋼。
- Cが0.20〜0.22である、請求項1に記載の帯鋼。
- Siが0.8〜1.2である、請求項1〜3のいずれか一項に記載の帯鋼。
- Si/C比が4.0以上である、請求項1〜4のいずれか一項に記載の帯鋼。
- 前記亜鉛系コーティングが、溶融亜鉛コーティングまたは合金化溶融亜鉛コーティングである、請求項1〜5のいずれか一項に記載の帯鋼。
- 前記亜鉛系コーティングが、0.5〜3.8重量%のAl、0.5〜3.0重量%のMg、場合によりPb、Sb、Ti、Ca、Mn、Sn、La、Ce、Cr、Ni、ZrおよびBiからなる群より選択される0.2重量%以下の1種類以上の追加の元素を含み、残部が亜鉛および不可避的不純物であるコーティングである、請求項1〜5のいずれか一項に記載の帯鋼。
- Nbの量が0.01〜0.04%である、請求項1〜7のいずれか一項に記載の帯鋼。
- 請求項1に記載の帯鋼の連続製造方法であって、下記ステップ:
1)重量%で、下記組成:
C:0.17〜0.24
Mn:1.8〜2.5
Si:0.65〜1.25
Al:0.3以下
場合により、Nb:0.1以下および/またはV:0.3以下および/またはTi:0.15以下および/またはCr:0.5以下および/またはMo:0.3以下
残部:鉄および不可避的不純物
を有し、
Si/Mn比が0.5以下かつSi/C比が3.0以上であり、
重量%で、ME=Mn+Cr+2Moで表されるMn当量MEが3.5以下である帯鋼を準備するステップ、
2)(Ac3+20)〜(Ac3−30)の範囲の温度T1(℃)まで前記帯鋼を加熱して完全オーステナイトミクロ組織または部分オーステナイトミクロ組織を形成するステップ、
3)620〜680℃の範囲の温度T2まで2〜4℃/秒の範囲の冷却速度で前記帯鋼を徐冷するステップ、
4)(Ms−20)〜(Ms+100)の範囲の温度T3(℃)まで25〜50℃/秒の範囲の冷却速度で前記帯鋼を急冷するステップ、
5)30〜220秒の時間tにわたって420〜550℃の範囲の固定温度または徐冷温度T4で前記帯鋼を保持するステップ、
6)亜鉛浴中で前記帯鋼を溶融めっきして亜鉛系コーティングを有する前記帯鋼を提供するステップ、
7)300℃より低い温度まで少なくとも5℃/秒の冷却速度で前記コーティングされた帯鋼を冷却するステップ、
8)ステップ7)で得られた前記コーティングされた帯鋼が、960〜1100MPaの範囲の引張強度、少なくとも500MPaの降伏強度、および、少なくとも12%の一様伸びを有する場合を除き、ステップ7)で得られた前記コーティングされた帯鋼に対して調質圧延処理を実施し、ステップ7)で得られた前記コーティングされた帯鋼の引張強度を960〜1100MPaに、降伏強度を少なくとも500MPaに、および、一様伸びを少なくとも12%に調整するステップ
を含んでなる、前記方法。 - 前記固定温度または徐冷温度T4が440〜480℃の範囲にある、請求項9に記載の方法。
- ステップ5)において前記固定温度または徐冷温度T4が温度T4 a 〜温度T4 b の範囲であり、温度T4 b と温度T4 a との差が40℃である、請求項9または10に記載の方法。
- ステップ5)において前記時間tが30〜80秒の範囲である、請求項9〜11のいずれか一項に記載の方法。
- ステップ6)において前記亜鉛浴に入れるときの前記帯鋼の温度が浴温よりも30℃を超えて高くない、請求項9〜12のいずれか一項に記載の方法。
- 前記亜鉛浴が0.10〜0.35重量%のAlを含み、残部が亜鉛および不可避的不純物である、請求項9〜13のいずれか一項に記載の方法。
- 前記亜鉛浴が重量%で0.5〜3.8のAl、0.5〜3.0のMg、不可避的不純物を含み、残部が亜鉛である、請求項9〜13のいずれか一項に記載の方法。
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