JP7239685B2 - 穴広げ率の高い熱間圧延鋼板及びその製造方法 - Google Patents
穴広げ率の高い熱間圧延鋼板及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 114
- 239000010959 steel Substances 0.000 title claims description 114
- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 238000001816 cooling Methods 0.000 claims description 44
- 229910000859 α-Fe Inorganic materials 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 29
- 229910000734 martensite Inorganic materials 0.000 claims description 29
- 229910001563 bainite Inorganic materials 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 16
- 239000011701 zinc Substances 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000005554 pickling Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 239000011572 manganese Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000399 optical microscopy Methods 0.000 description 1
- 238000012261 overproduction Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- -1 titanium nitrides Chemical class 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Description
- 上記組成を有する鋼半製品を提供する工程、次いで、
- 鋼板を得るために、鋼半製品を875~950℃の間に含まれる最終圧延温度で熱間圧延する工程、次いで、
- 冷却された鋼板を得るために、50℃/秒より高い冷却速度VR1で鋼板を冷却する、工程、次いで、
- 巻取られた鋼板を得るために、160℃未満かつMf未満の温度のTcoilで巻取る工程、次いで、
- 巻取られた板を熱処理温度θAに持続期間tAの間熱処理する工程であって、θA及びtAはPA=θA(22+log10tA)が15400~17500の間に含まれるようなものであり、θAはKで表され、tAは時間で表される工程を提供する。
- 1~5秒の間の持続時間t2の間、さらなる空冷が行われ、次いで
- 板は40℃/秒より高い冷却速度VR2で冷却される。
Ms(℃)=785-453%C-16.9%Ni-15%Cr-9.5%Mo+217(%C)2-71.5%C×%Mn-67.6%C×%Cr
厚さ28~40mmの間範囲の鋳造品の形の半製品は、表1に詳述した組成を有する。異なる組成については、カルシウム含有量は0.002重量%であり、組成の残余は鉄及び精錬から生じる不純物である。マルテンサイト仕上げ温度は、マルテンサイト開始温度の値から次のように計算した。Mf=Ms-245℃。これらの半製品を1150℃より高い温度で加熱し、さらに1.8~4.5mmの間に含まれる厚さまで熱間圧延した。表2は、適用された製造条件を詳述する。試験例1~15は上記の第1の冷却方式の実施形態に相当し、試験例16~18は上記の第2の冷却方式条件に相当する。巻取り後かつ熱処理後に酸洗工程を実施した。試験例4及び9では、熱間圧延鋼板を亜鉛メッキ(GI)する。
Claims (22)
- 熱間圧延鋼板であって、重量%において、
0.15%≦C≦0.20%
0.50%≦Mn≦2.00%
0.25%≦Si≦1.25%
0.10%≦Al≦1.00%
ここで、1.00%≦(Al+Si)≦2.00
0.001%≦Cr≦0.250%
P≦0.02%
S≦0.005%
N≦0.008%
並びに任意に
0.005%≦Mo≦0.250%
0.005%≦V≦0.250%
0.0001%≦Ca≦0.003%及び
0.001%≦Ti≦0.025%
の中の1種以上の元素を含み、残余は鉄及び不可避の不純物である化学組成を有し、微細組織は、表面分率で、フェライト及びベイナイトを含み、その合計は5%を超え、かつ厳密に20%未満であり、残余は焼き戻しマルテンサイトからなる熱間圧延鋼板。 - Si含有量が、0.40%~0.90%の間に含まれる、請求項1に記載の熱間圧延鋼板。
- Alが、0.30%から0.90%の間含まれる、請求項1又は2に記載の熱間圧延鋼板。
- Al+Si含有量が、1.20~2.00%の間に含まれる、請求項1~3のいずれか一項に記載の熱間圧延鋼板。
- 降伏強度YSが780MPa~1000MPaの間に含まれ、かつ引張強さTSが950MPa~1150MPaの間に含まれる、請求項1~4のいずれか一項に記載の熱間圧延鋼板。
- 全伸びが8%より高い、請求項1~5のいずれか一項に記載の熱間圧延鋼板。
- 穴広げ率HERが45%より高い、請求項1~6のいずれか一項に記載の熱間圧延鋼板。
- シャルピーVエネルギーが、20℃で50J/cm2より高い、請求項1~7のいずれか一項に記載の熱間圧延鋼板。
- 厚さが1.8~4.5mmの間に含まれる、請求項1~8のいずれか一項に記載の熱間圧延鋼板。
- 前記熱間圧延鋼板の厚さの5%未満である厚さのフェライト層を表面に含む、請求項1~9のいずれか一項に記載の熱間圧延鋼板。
- 前記熱間圧延鋼板が亜鉛又は亜鉛をベースとする合金で被覆されている、請求項1~10のいずれか一項に記載の熱間圧延鋼板。
- 前記亜鉛をベースとする被膜が、0.01~8.0重量%のAlを含み、任意に0.2~8.0重量%のMgを含み、残余がZnである、請求項11に記載の熱間圧延鋼板。
- 前記亜鉛をベースとする被膜が、0.15~0.40重量%の間のAlを含み、残余がZnである、請求項11に記載の熱間圧延鋼板。
- 以下の連続する工程を含む、熱間圧延鋼板を製造するための方法:
- 請求項1~4のいずれか一項に記載の組成を有する鋼半製品を提供する工程、次いで、
- 鋼板を得るために、前記鋼半製品を、875~950℃の間に含まれる最終圧延温度で熱間圧延する工程、次いで、
- 冷却された鋼板を得るために、少なくとも50℃/秒の冷却速度VR1で前記鋼板を冷却する工程であって、前記冷却が、i)前記最終圧延温度から、次の巻取りの工程の巻取り温度まで冷却速度V R1 で実施され、又はii)冷却速度V R1 で、前記最終圧延温度から、500~550℃の間に含まれる中間温度T i に達するまで冷却され、次いで、1~5秒の間に含まれる持続時間t 2 の間、さらなる空冷工程が行われ、次いで、鋼板を40℃/秒より高い冷却速度V R2 で、次の工程の巻取り温度まで冷却されることにより実施され、
次いで、
- 巻取られた鋼板を得るために、160℃未満かつMf未満の温度のTcoilで巻取る工程、次いで、
- 前記巻取られた板を熱処理温度θAに持続期間tAの間熱処理する工程であって、θA及びtAは、PA=θA(22+log10tA)が15400~17500の間に含まれるようなものであり、θAはKで表され、tAは時間で表される工程、
ここで、前記熱間圧延鋼板の微細組織は、表面分率で、フェライト及びベイナイトを含み、その合計は5%を超え、かつ厳密に20%未満であり、残余は焼き戻しマルテンサイトからなる。 - 前記熱処理する工程が、400℃~475℃の間に含まれる熱処理温度θAにおいて、不活性又はHNX雰囲気中でバッチにより実施され、前記焼鈍温度での持続時間tAが10~25時間の間に含まれる、請求項14に記載の熱間圧延鋼板を製造する方法。
- 前記熱処理する工程が、連続焼鈍ライン上で、500~600℃の間に含まれる熱処理温度θAまで行われ、前記熱処理温度における持続時間tAが40~100秒の間に含まれる、請求項14に記載の熱間圧延鋼板の製造方法。
- PAが、15500~17000の間に含まれる、請求項14~16のいずれか一項に記載の熱間圧延鋼板の製造方法。
- 前記巻取る工程の後かつ前記熱処理する工程の前に酸洗工程をさらに含む、請求項14~17のいずれか一項に記載の熱間圧延鋼板の製造方法。
- 前記熱処理する工程の後に酸洗工程をさらに含む、請求項14~18のいずれか一項に記載の製造方法。
- 前記冷却が水冷によって行われ、VR1が75℃/秒よりも高い、請求項14~19のいずれか一項に記載の製造方法。
- 前記空冷工程が、2~3秒の間に含まれる持続時間t2の間実施される、請求項20に記載の製造方法。
- 車両の構造部品の製造のための、請求項1~13のいずれか一項に記載の熱間圧延鋼板、又は請求項14~21のいずれか一項に従い製造された熱間圧延鋼板の使用。
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