JP2023506387A - 冷間圧延熱処理鋼板及びその製造方法 - Google Patents
冷間圧延熱処理鋼板及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 44
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 37
- 230000000717 retained effect Effects 0.000 claims abstract description 16
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 239000011572 manganese Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 238000000137 annealing Methods 0.000 claims description 13
- 239000010960 cold rolled steel Substances 0.000 claims description 13
- 238000010791 quenching Methods 0.000 claims description 11
- 230000000171 quenching effect Effects 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 238000005098 hot rolling Methods 0.000 claims description 4
- 150000001247 metal acetylides Chemical class 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 229910052796 boron Inorganic materials 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000000638 solvent extraction Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical group [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Abstract
Description
Ae3=890-20*√%C+20*%Si-30*%Mn+130*%Al
Ms=560-(30*%Mn+13*%Si-15*%Al+12*%Mo)-600*(1-exp(-0,96*C))
本発明による鋼の組成は、重量パーセントにより、次のものを含む。
試験した組成を次の表にまとめ、元素含有量を重量パーセントで表す。
鋳放しの鋼半製品を1200℃で再加熱し、仕上げ圧延温度FRTで熱間圧延し、巻き取り、温度TA1で最初に熱処理し、冷間圧延する前に前記TA1温度で保持時間ta1にわたって維持した。第2の焼鈍を温度TA2で行い、冷間圧延鋼を、焼入れ及び分配処理(Q&P)の前に、前記TA2温度で保持時間ta2にわたって維持し、続いて室温で冷却する。次の特定の条件を適用した。
試験した試料のミクロ組織を決定し、次の表にまとめた。
F:フェライト表面分率を表す
M:マルテンサイト表面分率を表す
M-A:島状マルテンサイト-オーステナイト表面分率を表す
表面分率は、以下の方法により決定される。試験片を冷間圧延熱処理鋼板から切り出し、研磨し、それ自体が既知の試薬でエッチングして、ミクロ組織を明らかにする。その後、切片を、光学顕微鏡又は走査型電子顕微鏡、例えば、BSE(後方散乱電子)装置に連結された電界放射型電子銃を備えた走査型電子顕微鏡(「FEG-SEM」)を用いて、5000倍を超える倍率で検査する。
試験した試料のミクロ組織を決定し、次の表にまとめた。
PM:分配マルテンサイト表面分率を表す
FM:フレッシュマルテンサイト表面分率を表す
F:フェライト表面分率を表す
M-A:島状マルテンサイト-オーステナイト表面分率を表す
第2の焼鈍により、0.7μm未満のサイズを有する微細なフレッシュマルテンサイト及び島状M-Aを有するより均質なミクロ組織が存在する。これに対して、試験6及び7では、第2の焼鈍がなく、したがって、オーステナイト中のMnのより顕著な富化があり、より不均質なサイズ分布を有する10%を超えるより大きなフレッシュマルテンサイト及び島状M-Aを形成する。
試験した試料の機械的特性を決定し、次の表にまとめた。
Claims (11)
- 冷間圧延熱処理鋼板であって、重量パーセントで
C:0.12~0.25%
Mn:3.0~8.0%
Si:0.70~1.50%
Al:0.3~1.2%
B:0.0002~0.004%
S≦0.010%
P≦0.020%
N≦0.008%
を含み、
任意に、重量パーセントで以下の元素のうちの1つ以上
Mo≦0.5%
V≦0.2%
Nb≦0.06%
Ti≦0.05%
を含み、
組成の残部は、鉄及び製錬から生じる不可避的不純物である組成を有する鋼から製造され、
当該鋼板が、表面分率で、
-5%~45%のフェライトと、
-25%~85%の分配マルテンサイトであって、厳密に2x106/mm2未満の炭化物密度を有する当該分配マルテンサイトと、
-10%~30%の残留オーステナイトと、
-8%未満のフレッシュマルテンサイトと、
-当該フレッシュマルテンサイトの一部が、10%未満の総表面分率で島状マルテンサイト-オーステナイト(M-A)の形状で残留オーステナイトと組み合わされていることと
からなるミクロ組織を有する、冷間圧延熱処理鋼板。 - マンガン含有量が3.0%~5.0%である、請求項1に記載の冷間圧延熱処理鋼板。
- ケイ素含有量が0.80%~1.30%である、請求項1~2のいずれか一項に記載の冷間圧延熱処理鋼板。
- フレッシュマルテンサイト及び島状マルテンサイト-オーステナイトのサイズが0.7μm未満である、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。
- 前記ミクロ組織が最大で6%のフレッシュマルテンサイトを含む、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。
- 降伏強度YSが950MPaより大きい、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。
- 引張強度TSが1180MPaより大きい、請求項1~6のいずれか一項に記載の冷間圧延熱処理鋼板。
- 一様伸びが10%より大きい、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。
- 穴広げ率が25%より大きい、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。
- MPaで表される降伏強度YS、MPaで表される引張強度TS、%で表される一様伸びUE、%で表される全伸びTE、%で表される穴広げ率HER、及び重量パーセントで表されるケイ素含有量が、次式:
(YS*UE+TS*TE+TS*HER)/%Si>65000
を満たす、請求項1~9のいずれか一項に記載の冷間圧延熱処理鋼板。 - 冷間圧延熱処理鋼板の製造方法であって、以下の連続する
-鋼を鋳造して半製品を得る工程であって、当該半製品が請求項1に記載の組成を有する、工程と、
-スラブを1150℃~1300℃である温度Treheatで再加熱する工程と、
-再加熱したスラブを800℃~950℃である仕上げ圧延温度FRTで熱間圧延して熱間圧延鋼板を得る工程と、
-熱間圧延鋼板を200℃~700℃である巻取り温度Tcoilで巻き取る工程と、
-熱間圧延鋼板を550℃~700℃である第1の焼鈍温度TA1で焼鈍し、当該鋼板を前記TA1温度で30秒~50時間の保持時間tA1にわたって維持する工程と、
-熱間圧延鋼板を冷間圧延して冷間圧延鋼板を得る工程と、
-冷間圧延鋼板をAe3-10℃を超える第2の焼鈍温度TA2まで再加熱し、当該鋼板を当該TA2温度で1秒~1000秒である保持時間tA2にわたって維持して、焼鈍時に、マルテンサイト及びベイナイトを含み、その合計は80%を超え、厳密に20%未満のフェライト、並びに厳密に20%未満の島状マルテンサイト-オーステナイト(M-A)及び炭化物の合計を含むミクロ組織を得る工程であって、Ae3は、式:
Ae3=890-20*√%C+20*%Si-30*%Mn+130*%Al
から計算される、工程と、
-冷間圧延鋼板を厳密にAe3より低く、(Ae1+Ae3)/2より高い温度TA3まで再加熱し、当該鋼板を当該焼鈍温度TA3で3秒~1000秒である保持時間tA3にわたって維持する工程であって、Ae1は、式:
Ae1=670+15*%Si-13*%Mn+18*%Al
から計算される、工程と、
-冷間圧延鋼板を(Ms-50℃)未満の焼入れ温度TQで焼入れして、焼入れ鋼板を得る工程であって、Msは、式:
Ms=560-(30*%Mn+13*%Si-15*%Al+12*%Mo)-600*(1-exp(-0,96*%C))
から計算される、工程と、
-焼入れ鋼板を350℃~550℃である分配温度TPまで再加熱し、当該焼入れ鋼板を当該分配温度で1秒~1000秒である分配時間にわたって維持する工程と、
-鋼板を室温まで冷却して、冷間圧延熱処理鋼板を得る工程と
を含む、製造方法。
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WO2018220598A1 (en) * | 2017-06-02 | 2018-12-06 | Arcelormittal | Steel sheet for manufacturing press hardened parts, press hardened part having a combination of high strength and crash ductility, and manufacturing methods thereof |
WO2019111084A1 (en) * | 2017-12-05 | 2019-06-13 | Arcelormittal | Cold rolled and annealed steel sheet and method of manufacturing the same |
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