JP6202579B2 - 冷間圧延による平鋼製品及びそれを製造するための方法 - Google Patents
冷間圧延による平鋼製品及びそれを製造するための方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 96
- 239000010959 steel Substances 0.000 title claims description 96
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000137 annealing Methods 0.000 claims description 48
- 239000010960 cold rolled steel Substances 0.000 claims description 47
- 239000010949 copper Substances 0.000 claims description 32
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 30
- 229910052802 copper Inorganic materials 0.000 claims description 28
- 239000011651 chromium Substances 0.000 claims description 27
- 229910052799 carbon Inorganic materials 0.000 claims description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 25
- 229910052804 chromium Inorganic materials 0.000 claims description 23
- 238000005097 cold rolling Methods 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 20
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 19
- 229910001566 austenite Inorganic materials 0.000 claims description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 229910001563 bainite Inorganic materials 0.000 claims description 18
- 239000011572 manganese Substances 0.000 claims description 18
- 229910000734 martensite Inorganic materials 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 15
- 238000005098 hot rolling Methods 0.000 claims description 14
- 229910052748 manganese Inorganic materials 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 13
- 239000010936 titanium Substances 0.000 claims description 12
- 239000010955 niobium Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 4
- 229910017052 cobalt Inorganic materials 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 239000011733 molybdenum Substances 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 2
- 239000011241 protective layer Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 description 34
- 230000000694 effects Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000000161 steel melt Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Description
炭素(C): 0.10乃至0.60%、
ケイ素(Si): 0.4乃至2.5%、
アルミニウム(Al):3.0%以下、
マンガン(Mn): 0.4乃至3.0%、
ニッケル(Ni): 1.0%以下、
銅(Cu): 2.0%以下、
モリブデン(Mo): 0.4%以下、
クロム(Cr): 2%以下、
コバルト(Co): 1.5%以下、
チタン(Ti): 0.2%以下、
ニオブ(Nb): 0.2%以下、
バナジウム(V): 0.5%以下
を具えるという事実により際立っている。
予製品を熱間圧延して、1又はそれ以上の圧延孔型で熱延鋼板を形成するステップであって、得られた熱延鋼板が、最後の圧延孔型を出る際に、少なくとも830℃の熱間圧延終了温度を有する、ステップと、
得られた熱延鋼板を、熱間圧延終了温度と560℃との間のコイリング温度でコイリングするステップと、
熱延鋼板を冷間圧延して、少なくとも30%の冷間圧延度で冷延鋼板を形成するステップと、
得られる冷延鋼板を熱処理するステップと、
を具えており、
熱処理の工程において冷延鋼板が、
少なくとも800℃に達する焼鈍温度に加熱され、
50乃至150秒の焼鈍時間の間、焼鈍温度で任意に保持され、
焼鈍温度から開始され、470℃の上限を有し冷延鋼板の微細構造にマルテンサイトが形成するマルテンサイト開始温度MSよりも高い下限を有する保持温度範囲の保持温度まで、少なくともに達する8℃/sの冷却速度で冷却され、
冷延鋼板の微細構造に少なくとも20体積%のベイナイト形成をするのに十分な時間、保持温度で保持される。
1<0.5%Mn+0.167%Cr+0.125%Ni+0.125%Cu+1.334%C<2
という条件を満足するという事実により、特に確実にすることができる。ここで、%Mnは、それぞれのマンガン含有量の重量%を示し、%Crは、それぞれのクロム含有量の重量%を示し、%Niは、それぞれのニッケル含有量の重量%を示し、%Cuは、それぞれの銅含有量の重量%を示し、%Cは、それぞれの炭素含有量の重量%を示す。
Claims (15)
- 冷間圧延による平鋼製品であって、
少なくとも1400MPaの引張強さRm及び少なくとも5%の伸びA80を有しており、
少なくとも炭素、ケイ素、アルミニウム、マンガン、銅、クロム、チタン及びバナジウムを含んでおり、重量%で、
炭素(C): 0.10乃至0.60%、
ケイ素(Si): 0.4乃至2.5%、
アルミニウム(Al):3.0%以下、
マンガン(Mn): 0.4乃至3.0%、
ニッケル(Ni): 1.0%以下、
銅(Cu): 2.0%以下、
モリブデン(Mo): 0.4%以下、
クロム(Cr): 2%以下、
コバルト(Co): 1.5%以下、
チタン(Ti): 0.2%以下、
ニオブ(Nb): 0.2%以下、
バナジウム(V): 0.5%以下、
残部:鉄及び不可避の不純物からなり、前記平鋼製品の微細構造が、
少なくとも20体積%のベイナイトと、
10乃至35体積%の残留オーステナイトと、
残りのマルテンサイトとから成り、
前記残留オーステナイトが、主に、5μm未満の結晶粒径を有する残留オーステナイト群の小さな、球状の島を具えた膜形式で前記冷間圧延による平鋼製品に存在することを特徴とする平鋼製品。 - 炭素含有量が、少なくとも0.25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。
- 炭素含有量が、少なくとも0.27重量%であることを特徴とする請求項1又は2に記載の平鋼製品。
- ケイ素含有量が、少なくとも1.0重量%であることを特徴とする請求項1乃至3のいずれか1項に記載の平鋼製品。
- アルミニウム含有量が、少なくとも0.01重量%であることを特徴とする請求項1乃至4のいずれか1項に記載の平鋼製品。
- 銅含有量が、少なくとも0.2重量%であることを特徴とする請求項1乃至5のいずれか1項に記載の平鋼製品。
- 銅含有量が、少なくとも0.55重量%であることを特徴とする請求項5に記載の平鋼製品。
- クロム含有量が、少なくとも0.3重量%であることを特徴とする請求項1乃至7のいずれか1項に記載の平鋼製品。
- マンガン、クロム、ニッケル、銅及び炭素の含有量が、
%Mnを各マンガン含有量の重量%、
%Crを各クロム含有量の重量%、
%Niを各ニッケル含有量の重量%、
%Cuを各銅含有量の重量%、
%Cを各炭素含有量の重量%、
とするとき、
1<0.5%Mn+0.167%Cr+0.125%Ni+0.125%Cu+1.334%C<2
の条件を満足することを特徴とする請求項1乃至8のいずれか1項に記載の平鋼製品。 - 前記微細構造が、少なくとも50体積%のベイナイトを具えることを特徴とする請求項1乃至9のいずれか1項に記載の平鋼製品。
- 前記微細構造が、10乃至25体積%の残留オーステナイトを具えることを特徴とする請求項1乃至10のいずれか1項に記載の平鋼製品。
- 請求項1乃至11のいずれか1項に記載の平鋼製品を製造するための方法であって、当該方法が、
スラブ、薄スラブ又は鋳造片の形態の予製品を提供するステップであって、前記スラブ、薄スラブ又は鋳造片が、少なくとも炭素、ケイ素、アルミニウム、マンガン、銅、クロム、チタン及びバナジウムを含んでおり、重量%で、炭素(C):0.10乃至0.60%、ケイ素(Si):0.4乃至2.5%、アルミニウム(Al):3.0%以下、マンガン(Mn):0.4乃至3.0%、ニッケル(Ni):1.0%以下、銅(Cu):2.0%以下、モリブデン(Mo):0.4%以下、クロム(Cr):2%以下、コバルト(Co):1.5%以下、チタン(Ti):0.2%以下、ニオブ(Nb):0.2%以下、バナジウム(V):0.5%以下、残部:鉄及び不可避の不純物からなる、ステップと、
前記予製品を熱間圧延して、1又はそれ以上の圧延ロールで熱延鋼板を形成するステップであって、得られた前記熱延鋼板が、最後の圧延ロールを出る際に、少なくとも830℃の熱間圧延終了温度を有する、ステップと、
前記得られた熱延鋼板を、前記熱間圧延終了温度と560℃との間のコイリング温度でコイリングするステップと、
前記熱延鋼板を冷間圧延して、少なくとも30%の冷間圧延度で冷延鋼板を形成するステップと、
得られる前記冷延鋼板を熱処理するステップと、
を具えており、
前記熱処理の工程において前記冷延鋼板が、
少なくとも800℃に達する焼鈍温度に加熱され、
前記焼鈍温度から開始され、470℃の上限を有し前記冷延鋼板の微細構造にマルテンサイトが形成するマルテンサイト開始温度MSよりも高い下限を有する保持温度範囲の保持温度まで、少なくとも8℃/sに達する冷却速度で冷却され、
前記冷延鋼板の微細構造に少なくとも20体積%のベイナイト形成をするのに十分な時間、前記保持温度で保持されることを特徴とする方法。 - 前記熱間圧延終了温度が、850乃至950℃であることを特徴とする請求項12に記載の方法。
- 前記保持温度が、300乃至420℃であることを特徴とする請求項12又は13に記載の方法。
- 前記冷延鋼板が、前記熱処理の後に金属保護層でコーティングされることを特徴とする請求項12乃至14のいずれか1項に記載の方法。
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EP12178332.8 | 2012-07-27 | ||
PCT/EP2013/065838 WO2014016421A1 (de) | 2012-07-27 | 2013-07-26 | Kaltgewalztes stahlflachprodukt und verfahren zu seiner herstellung |
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US20200165711A1 (en) * | 2016-02-19 | 2020-05-28 | Nippon Steel & Sumitomo Metal Corporation | Steel |
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CN104641008A (zh) | 2015-05-20 |
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