JP4860784B2 - 成形性に優れた高強度鋼板及びその製造方法 - Google Patents
成形性に優れた高強度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 71
- 239000010959 steel Substances 0.000 title claims description 71
- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 229910000859 α-Fe Inorganic materials 0.000 claims description 28
- 238000000137 annealing Methods 0.000 claims description 27
- 238000005246 galvanizing Methods 0.000 claims description 27
- 229910000734 martensite Inorganic materials 0.000 claims description 26
- 239000010960 cold rolled steel Substances 0.000 claims description 21
- 238000005097 cold rolling Methods 0.000 claims description 18
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 238000005554 pickling Methods 0.000 claims description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 6
- 239000008397 galvanized steel Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007542 hardness measurement Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 23
- 238000006243 chemical reaction Methods 0.000 description 22
- 238000012360 testing method Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 8
- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 150000002910 rare earth metals Chemical class 0.000 description 7
- 238000009864 tensile test Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 229910000794 TRIP steel Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
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Description
C :0.03%〜0.20%、
Si:0.005%〜1.0%、
Mn:1.0%〜3.1%、及び
Al:0.005%〜1.2%を含有し、
P含有量が0%超、かつ0.06%以下であり、
S含有量が0%超、かつ0.01%以下であり、
N含有量が0%超、かつ0.01%以下であり、
残部がFe及び不可避不純物からなり、
金属組織がフェライト及びマルテンサイトを含み、
Al含有量(%)及びSi含有量(%)について、式(A)の関係が成立し、
ナノインデンターを用いて100箇所以上で測定された硬度に関する式(B)で定義される平均値Yaveが40以上であることを特徴とする成形性に優れた高強度鋼板。
0.3≦0.7×[Si]+[Al]≦1.5 ・・・(A)
Yave=Σ(180×(Xi−3)−2/n) ・・・(B)
([Al]はAl含有量(%)を示し、[Si]はSi含有量(%)を示し、nは硬度の測定箇所の総数を示し、Xiは第i番目(iはn以下の自然数)の測定箇所での硬度(GPa)を示す。)
B :0.00005%〜0.005%、
Mo:0.01%〜0.5%、
Cr:0.01%〜1.0%、
V :0.01%〜0.1%、
Ti:0.01%〜0.1%、
Nb:0.005%〜0.05%、
Ca:0.0005%〜0.005%、及び
REM:0.0005%〜0.005%
からなる群から選択された少なくとも一種を有することを特徴とする(1)に記載の成形性に優れた高強度鋼板。
次に、前記熱延鋼帯の酸洗を行う工程と、
次に、複数のスタンドを備えたタンデム式圧延機を用いて前記熱延鋼帯の冷間圧延を行って冷延鋼帯を得る工程と、
次に、連続焼鈍設備で前記冷延鋼帯の連続焼鈍を行う工程と、
次に、前記冷延鋼帯の調質圧延を行う工程と、
を有し、
前記鋼帯は、質量%で、
C :0.03%〜0.20%、
Si:0.005%〜1.0%、
Mn:1.0%〜3.1%、及び
Al:0.005%〜1.2%を含有し、
P含有量が0%超、かつ0.06%以下であり、
S含有量が0%超、かつ0.01%以下であり、
N含有量が0%超、かつ0.01%以下であり、
残部がFe及び不可避不純物からなり、
Al含有量(%)及びSi含有量(%)について、式(A)の関係が成立し、
前記複数のスタンドのうちの最初のスタンドにおける冷延率、及び前記連続焼鈍設備における最初の加熱帯での昇温速度について、式(C)の関係が成立することを特徴とする成形性に優れた高強度鋼板の製造方法。
0.3≦0.7×[Si]+[Al]≦1.5 ・・・(A)
50≦r10.85×V≦300 ・・・(C)
(r1は前記冷延率(%)を示し、Vは前記昇温速度(℃/s)を示す。)
前記冷延鋼帯に溶融亜鉛めっき処理を行う工程と、
次に、前記冷延鋼帯の調質圧延を行う工程と、
を有することを特徴とする(6)に記載の成形性に優れた高強度鋼板の製造方法。
式(D)の関係が成立することを特徴とする(7)に記載の成形性に優れた高強度鋼板の製造方法。
t≦60×[C]+20×[Mn]+24×[Cr]+40×[Mo] ・・・(D)
([C]はC含有量(%)を示し、[Mn]はMn含有量(%)を示し、[Cr]はCr含有量(%)を示し、[Mo]はMo含有量(%)を示す。)
0.3≦0.7×[Si]+[Al]≦1.5 ・・・(A)
ここで、[Al]はAl含有量(%)を示し、[Si]はSi含有量(%)を示す。
Yave=Σ(180×(Xi−3)−2/n) ・・・(B)
ここで、nは硬度の測定箇所の総数を示し、Xiは第i番目(iはn以下の自然数)の測定箇所での硬度(GPa)を示す。
50≦r10.85×V≦300 ・・・(C)
t≦60×[C]+20×[Mn]+24×[Cr]+40×[Mo] ・・・(D)
ここで、[C]はC含有量(%)を示し、[Mn]はMn含有量(%)を示し、[Cr]はCr含有量(%)を示し、[Mo]はMo含有量(%)を示す。
Claims (8)
- 質量%で、
C :0.03%〜0.20%、
Si:0.005%〜1.0%、
Mn:1.0%〜3.1%、及び
Al:0.005%〜1.2%を含有し、
P含有量が0%超、かつ0.06%以下であり、
S含有量が0%超、かつ0.01%以下であり、
N含有量が0%超、かつ0.01%以下であり、
残部がFe及び不可避不純物からなり、
金属組織がフェライト及びマルテンサイトを含み、
Al含有量(%)及びSi含有量(%)について、式(A)の関係が成立し、
ナノインデンターを用いて100箇所以上で測定された硬度に関する式(B)で定義される平均値Yaveが40以上であることを特徴とする成形性に優れた高強度鋼板。
0.3≦0.7×[Si]+[Al]≦1.5 ・・・(A)
Yave=Σ(180×(Xi−3)−2/n) ・・・(B)
([Al]はAl含有量(%)を示し、[Si]はSi含有量(%)を示し、nは硬度の測定箇所の総数を示し、Xiは第i番目(iはn以下の自然数)の測定箇所での硬度(GPa)を示す。) - さらに、質量%で、
B :0.00005%〜0.005%、
Mo:0.01%〜0.5%、
Cr:0.01%〜1.0%、
V :0.01%〜0.1%、
Ti:0.01%〜0.1%、
Nb:0.005%〜0.05%、
Ca:0.0005%〜0.005%、及び
REM:0.0005%〜0.005%
からなる群から選択された少なくとも一種を有することを特徴とする請求項1に記載の成形性に優れた高強度鋼板。 - 前記高強度鋼板が冷延鋼板であることを特徴とする請求項1又は2に記載の成形性に優れた高強度鋼板。
- 前記高強度鋼板が溶融亜鉛めっき鋼板であることを特徴とする請求項1乃至3のいずれか1項に記載の成形性に優れた高強度鋼板。
- 前記金属組織中のマルテンサイト分率が5%超であることを特徴とする請求項1乃至4のいずれか1項に記載の成形性に優れた高強度鋼板。
- 熱間圧延を行って熱延鋼帯を得る工程と、
次に、前記熱延鋼帯の酸洗を行う工程と、
次に、複数のスタンドを備えたタンデム式圧延機を用いて前記熱延鋼帯の冷間圧延を行って冷延鋼帯を得る工程と、
次に、連続焼鈍設備で前記冷延鋼帯の連続焼鈍を行う工程と、
次に、前記冷延鋼帯の調質圧延を行う工程と、
を有し、
前記鋼帯は、質量%で、
C :0.03%〜0.20%、
Si:0.005%〜1.0%、
Mn:1.0%〜3.1%、及び
Al:0.005%〜1.2%を含有し、
P含有量が0%超、かつ0.06%以下であり、
S含有量が0%超、かつ0.01%以下であり、
N含有量が0%超、かつ0.01%以下であり、
残部がFe及び不可避不純物からなり、
Al含有量(%)及びSi含有量(%)について、式(A)の関係が成立し、
前記複数のスタンドのうちの最初のスタンドにおける冷延率、及び前記連続焼鈍設備における最初の加熱帯での昇温速度について、式(C)の関係が成立することを特徴とする成形性に優れた高強度鋼板の製造方法。
0.3≦0.7×[Si]+[Al]≦1.5 ・・・(A)
50≦r10.85×V≦300 ・・・(C)
(r1は前記冷延率(%)を示し、Vは前記昇温速度(℃/s)を示す。) - 前記連続焼鈍の後に、
前記冷延鋼帯に溶融亜鉛めっき処理を行う工程と、
次に、前記冷延鋼帯の調質圧延を行う工程と、
を有することを特徴とする請求項6に記載の成形性に優れた高強度鋼板の製造方法。 - 前記溶融亜鉛めっき処理を行う工程の後に、前記冷延鋼帯を400℃乃至650℃の温度にt秒間保持する工程を有し、
式(D)の関係が成立することを特徴とする請求項7に記載の成形性に優れた高強度鋼板の製造方法。
t≦60×[C]+20×[Mn]+24×[Cr]+40×[Mo] ・・・(D)
([C]はC含有量(%)を示し、[Mn]はMn含有量(%)を示し、[Cr]はCr含有量(%)を示し、[Mo]はMo含有量(%)を示す。)
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