JP2020147852A - 強度、延性および成形性が改善された被覆鋼板の製造方法 - Google Patents
強度、延性および成形性が改善された被覆鋼板の製造方法 Download PDFInfo
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- JP2020147852A JP2020147852A JP2020099141A JP2020099141A JP2020147852A JP 2020147852 A JP2020147852 A JP 2020147852A JP 2020099141 A JP2020099141 A JP 2020099141A JP 2020099141 A JP2020099141 A JP 2020099141A JP 2020147852 A JP2020147852 A JP 2020147852A
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- steel sheet
- temperature
- martensite
- bainite
- distribution
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 136
- 239000010959 steel Substances 0.000 title claims abstract description 136
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 30
- 230000000171 quenching effect Effects 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000000638 solvent extraction Methods 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 50
- 229910000734 martensite Inorganic materials 0.000 claims description 49
- 238000009826 distribution Methods 0.000 claims description 35
- 238000000137 annealing Methods 0.000 claims description 24
- 229910001563 bainite Inorganic materials 0.000 claims description 23
- 230000009466 transformation Effects 0.000 claims description 21
- 229910001566 austenite Inorganic materials 0.000 claims description 19
- 238000005246 galvanizing Methods 0.000 claims description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 230000000717 retained effect Effects 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 7
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 238000001771 vacuum deposition Methods 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 14
- 239000011572 manganese Substances 0.000 description 14
- 239000011651 chromium Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- -1 zinc-magnesium-aluminum Chemical compound 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000254 damaging effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000001912 gas jet deposition Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 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
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000011265 semifinished product Substances 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
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
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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
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
Description
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物である鋼板を熱処理することにより、鋼板を製造する方法であって、熱処理および被覆操作が、連続する以下の工程
−鋼板を、TA1=Ac3−0.45×(Ms−QT)[ここで、QTは180℃から300℃の間の焼き入れ温度である]からTA2=830℃の間の焼鈍温度TAで30秒を超える時間加熱および焼鈍する工程、
−鋼板を180℃から300℃の間の焼き入れ温度QTまで冷却することにより、鋼板を焼き入れする工程、
−380℃から480℃の間の分配温度PTまで10秒から300秒の間の分配時間、鋼板を加熱する工程、
−少なくとも25℃/秒の冷却速度で室温まで鋼板を冷却する工程
を含む該方法に関する。
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物であり、その微細構造が、5%から25%の間の変態区間フェライト、少なくとも50%の分配されたマルテンサイト、少なくとも10%の残留オーステナイト、10%未満の新たなマルテンサイト、およびベイナイトを含み、分配されたマルテンサイトとベイナイトとの合計は少なくとも60%である鋼板にも関する。
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物である鋼板を熱処理し、被覆することにより、製造する方法であって、熱処理および被覆操作が、連続する以下の工程
−鋼板を、TA1=Ac3−0.45×(Ms−QT)[ここで、QTは180℃から300℃の間の焼き入れ温度である]からTA2=830℃の間の焼鈍温度TAで30秒を超える時間加熱および焼鈍する工程、
−鋼板を焼き入れ温度QTまで冷却することにより、鋼板を焼き入れする工程、
−380℃から480℃の間の分配温度PTまで10秒から300秒の間の分配時間、鋼板を加熱する工程、
−室温に冷却した後に電気亜鉛めっきもしくは真空被覆、または鋼板を溶融めっきするいずれかによって鋼板を被覆し、次いで鋼板を室温まで冷却する工程
を含む該方法に関する。
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物であり、その微細構造は、5%から25%の間の変態区間フェライト、少なくとも10%の残留オーステナイト、ならびに少なくとも65%のマルテンサイトおよびベイナイトを含む鋼板にも関する。
Ac3=910−203[C]1/2−15.2[Ni]+44,7[Si]+104[V]+31.5[Mo]+13.1[W]−30[Mn]−11[Cr]−20[Cu]+700[P]+400[Al]+120[As]+400[Ti]
Ms=539−423[C]−30.4[Mn]−17.7[Ni]−12.1[Cr]−11[Si]−7.5[Mo]
C=0.19%、Si=1.5%、Mn=2.2%、Cr=0.2%、Al=0.030%、残部はFeおよび不純物である。Cu、Ni、B、Nb、Ti、V等の不純物元素は全て、0.05%未満の含有率を有する。鋼板は熱間圧延および冷間圧延によって製造された。この鋼板の理論的Ms変態点は369℃であり、計算されたAc3点は849℃である。
Claims (20)
- 5%から25%の間の変態区間フェライトと、少なくとも10%の残留オーステナイトと、少なくとも50%の分配されたマルテンサイトと、10%未満の新たなマルテンサイトと、ベイナイトとを含有し、分配されたマルテンサイトおよびベイナイトの合計が少なくとも60%を含む微細構造を有する鋼板を、鋼板の化学組成が重量%で、
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物である鋼板を熱処理することにより、製造する方法であって、熱処理操作が、連続する以下の工程
−鋼板を、TA1=Ac3−0.45×(Ms−QT)[ここで、QTは180℃から300℃の間の焼き入れ温度である]からTA2=830℃の間の焼鈍温度TAで30秒を超える時間加熱および焼鈍する工程、
−鋼板を180℃から300℃の間の焼き入れ温度QTまで冷却することにより、鋼板を焼き入れする工程、
−380℃から480℃の間の分配温度PTまで10秒から300秒の間の分配時間鋼板を加熱する工程、
−少なくとも25℃/秒の冷却速度で室温まで鋼板を冷却する工程
を含む該方法。 - 0.17%≦C≦0.21%である、請求項1に記載の方法。
- 1.3%≦Si≦1.6%である、請求項1または請求項2に記載の方法。
- 2.1%≦Mn≦2.3%である、請求項1から3のいずれか一項に記載の方法。
- 10秒から90秒の間の分配時間について、分配温度PTは430℃から480℃の間である、請求項1から4のいずれか一項に記載の方法。
- 10秒から300秒の間の分配時間について、分配温度PTは380℃から430℃の間である、請求項1から4のいずれか一項に記載の方法。
- 被覆鋼板を製造するための、請求項1から6のいずれか一項に記載の方法であって、該方法が分配時間Ptの間、分配温度PTまで鋼板を加熱する工程と、室温まで鋼板を冷却する工程との間に、鋼板を溶融めっきする工程を含む、方法。
- 溶融めっき工程は、亜鉛めっき工程である、請求項7に記載の方法。
- 溶融めっき工程は、AlまたはAl合金浴を使用して行われる、請求項7に記載の方法。
- 被覆鋼板を製造するために、方法は、鋼板を室温まで冷却した後、電気亜鉛めっきまたは真空被覆のいずれかによって鋼板を被覆する工程を含む、請求項1から6のいずれか一項に記載の方法。
- マルテンサイトとベイナイトとの合計は、少なくとも65%である、請求項1から10のいずれか一項に記載の方法。
- 鋼板の化学組成が重量%で、
0.15%≦C≦0.25%
1.2%≦Si≦1.8%
2%≦Mn≦2.4%
0.1%≦Cr≦0.25%
Al≦0.5%
を含み、残部がFeおよび不可避的不純物であり、その微細構造は、5%から25%の間の変態区間フェライト、少なくとも50%の分配されたマルテンサイト、少なくとも10%の残留オーステナイト、10%未満の新たなマルテンサイト、およびベイナイトを含み、分配されたマルテンサイトとベイナイトとの合計は少なくとも60%である鋼板。 - 0.17%≦C≦0.21%である、請求項12に記載の鋼板。
- 1.3%≦Si≦1.6%である、請求項12または請求項13に記載の鋼板。
- 2.1%≦Mn≦2.3%である、請求項12から14のいずれか一項に記載の鋼板。
- 鋼板は、ZnまたはZn合金で被覆される、請求項12から15のいずれか一項に記載の鋼板。
- 鋼板は、AlまたはAl合金で被覆される、請求項12から15のいずれか一項に記載の鋼板。
- 鋼板は、少なくとも550MPaの降伏強度、少なくとも980MPaの引張強度、少なくとも12%の均一伸び、少なくとも18%の全伸び、および 少なくとも30%の穴広げ率を有する、請求項12から17のいずれか一項に記載の鋼板。
- マルテンサイトとベイナイトとの合計は、少なくとも65%である、請求項12から17のいずれか一項に記載の鋼板。
- 白色の車体用部品を製造するための請求項12から19のいずれか一項に記載のまたは請求項1から11のいずれか一項に従って製造された鋼板の使用。
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