JP6460295B1 - 鋼板及びその製造方法 - Google Patents
鋼板及びその製造方法 Download PDFInfo
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- JP6460295B1 JP6460295B1 JP2018548011A JP2018548011A JP6460295B1 JP 6460295 B1 JP6460295 B1 JP 6460295B1 JP 2018548011 A JP2018548011 A JP 2018548011A JP 2018548011 A JP2018548011 A JP 2018548011A JP 6460295 B1 JP6460295 B1 JP 6460295B1
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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Abstract
Description
100≦0.027×ln(t)×T×ln(X)≦280 (1)
(ただし、Tは焼鈍温度(℃)、tは焼鈍均熱帯を通過する時間(秒)、Xは均熱帯での板張力(MPa))
Cは、強度を確保するために添加される元素である。C量が0.0010%未満では、必要な強度が確保できない。C量が0.0035%を超えると、必要なr値を確保できない。このため、C量は、0.0010%以上0.0035%以下であり、適切な強度の確保する観点から、0.0015%以上0.0035%以下とすることが好ましい。
Alは、通常、鋼の脱酸に用いられる元素である。本実施形態の鋼板においては、鋼中のNをAlNにすることなく固溶Nとするために、その添加量は極力少なくする。鋼板中のAlの含有量が0.005%未満であれば、鋼中の固溶NをほぼAlNにすることなく、Nの固溶強化が得られる。また、Al量が0.005%未満であれば、良好なフェライト結晶粒のアスペクト比が得られる。鋼板中のAlを極力少なくするため、本実施形態では、後述のMnにより脱酸を行う。好ましいAl量は0.003%以下であり、より好ましくは0.002%以下である。
Siは、強度確保に有効な元素であり、また、脱酸にも有効であるが、本実施形態では必須の元素ではない。Si量が0.050%を超えると、熱延工程でスケール模様と呼ばれる表面欠陥が発生し、外観が損なわれるので、Si量は0.050%以下とする。脱酸、強度確保の効果を得るためには、0.005%以上含有させることが好ましい。このため、Si量は、0.005%以上0.050%以下が好ましく、耐食性の観点から、0.005%以上0.030%以下がより好ましい。
Mnは、Sによる熱間割れを防止して外観を安定させる上で有効な元素である。また、本実施形態ではAlに変わる脱酸元素であるので、0.10%以上含有させる。Mnの過度の添加は、耐食性を悪化させ、鋼板の硬質化による冷間圧延性、成形性を悪化させ、外観に悪影響を与えるため、0.50%以下とする。このため、Mn量は、0.10%以上0.50%以下である。
Pは、鋼を硬質化させ、加工性を悪化させる元素である。また、成形不良をひきおこし、外観にも悪影響を与えるため、含有量は0.040%以下とする。より成形性を確保するには、0.020%以下とするのが好ましい。Pの含有量は0でもよいが、脱りんコスト及び時間の都合から、0.001%以上含有してもよい。
Sは、鋼中に介在物として存在し、延性を低下させる元素である。さらに、表面割れを引き起こし外観不良、耐食性の劣化をもたらすので、含有量は0.040%以下とする。特に良好な耐食性が要求される場合は、0.005%以下とすることが好ましい。Sの含有量は0でもよいが、脱硫コスト及び時間の都合から、0.001%以上含有してもよい。
Nは、固溶強化による鋼板強度の増加に必要な元素である。Nは意図的に添加しなくとも、通常、不純物として0.0010%以上含有され、Al量を低減することにより、Nによる固溶強化は得られるので、下限は規定しない。一方、Nが0.0050%を超えるとr値が低下するので、0.0050%以下とする。強度の観点からNの好ましい下限は0.020%であり、r値の観点から好ましい上限は0.0040%である。
Diffraction、電子線後方散乱回折)法により得られた結晶方位データを基に算出した。
0.027×ln(t)×T×ln(X) (1)
(ただし、Tは焼鈍温度(℃)、tは焼鈍均熱帯を通過する時間(秒)、Xは均熱帯での板張力(MPa))
で導かれる値が、100以上280以下を満たすように実施し、r値をコントロールする。
表1に示す成分の冷延鋼板に、表2に示す焼鈍温度、均熱帯通板時間、均熱帯での板張力で焼鈍を施し、さらに調質圧延を施し、板厚0.14〜0.16mmの缶用鋼板を製造した。
表1、表2のNo.5、No.12の鋼板について、板幅方向でのr値のばらつきを測定した。r値のばらつきは、鋼板の中央部、両端からそれぞれ10mmの位置の3箇所で、実施例1と同様に平均r値を測定し、3箇所の平均r値の最大値、最小値の差で評価した。
2 Sn又はCrめっき層
3 樹脂フィルム
Claims (9)
- 質量%で、
C :0.0010〜0.0035%、
Si:0.050%以下、
Mn:0.10〜0.50%、
P :0.040%以下、
S :0.040%以下、
Al:0.005%未満、及び
N :0.0050%以下
を含有し、残部がFe及び不可避的不純物であり、
フェライト結晶粒の板幅方向長さに対する板厚方向長さの比の平均値が0.70以上であり、
降伏強度が500MPa以上であり、
圧延方向0〜90°の範囲で、r値の最小値が1.50以上、r値の平均値が1.70以上、r値の最大値と最小値の差が0.50以下である
ことを特徴とする鋼板。 - 圧延方向0〜90°の範囲で、r値の最小値が1.60以上、r値の平均値が1.75以上であることを特徴とする請求項1に記載の鋼板。
- 鋼板表面にSnめっき層を有する請求項1又は2に記載の鋼板。
- 鋼板表面にCrめっき層を有する請求項1又は2に記載の鋼板。
- 片面又は両面の表面に、さらに樹脂フィルムを有する請求項1〜4のいずれか1項に記載の鋼板。
- 請求項1又は2に記載の鋼板の製造方法であって、
質量%で、
C :0.0010〜0.0035%、
Si:0.050%以下、
Mn:0.10〜0.50%、
P :0.040%以下、
S :0.040%以下、
Al:0.005%未満、及び
N :0.0050%以下
を含有し、残部がFe及び不可避的不純物であるスラブに、熱延、酸洗、冷延を施し、
得られた冷延鋼板に、下記(1)式を満たす焼鈍温度T、均熱帯を通過する時間t、及び均熱帯での板張力Xにて、焼鈍を施し、
その後調質圧延を行う
ことを特徴とする鋼板の製造方法。
100≦0.027×ln(t)×T×ln(X)≦280 (1)
(ただし、Tは焼鈍温度(℃)、tは焼鈍均熱帯を通過する時間(秒)、Xは均熱帯での板張力(MPa)) - 鋼板表面にSnめっきを施すことを特徴とする請求項6に記載の鋼板の製造方法。
- 鋼板表面にCrめっきを施すことを特徴とする請求項6に記載の鋼板の製造方法。
- 片面又は両面の表面に、さらに樹脂フィルムを被覆することを特徴とする請求項6〜8のいずれか1項に記載の鋼板の製造方法。
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Citations (4)
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JPH0741903A (ja) * | 1993-08-02 | 1995-02-10 | Nippon Steel Corp | 加工性に優れ異方性の小さい深絞り用熱延鋼板およびその製造方法 |
JPH10280089A (ja) * | 1997-04-03 | 1998-10-20 | Kawasaki Steel Corp | 2ピース変形缶用鋼板および2ピース変形缶体、ならびにそれらの製造方法 |
JP2005200751A (ja) * | 2004-01-19 | 2005-07-28 | Jfe Steel Kk | 耐二次加工脆性およびめっき密着性に優れた高成形性燃料タンク用めっき熱延鋼板およびその製造方法 |
JP2016079505A (ja) * | 2014-10-10 | 2016-05-16 | Jfeスチール株式会社 | 王冠用鋼板およびその製造方法 |
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US3761324A (en) * | 1971-01-18 | 1973-09-25 | Armco Steel Corp | Columbium treated low carbon steel |
JPH11315346A (ja) | 1998-05-06 | 1999-11-16 | Nippon Steel Corp | イヤリング性の優れた深絞り缶用鋼板および製造方法 |
WO2016056239A1 (ja) * | 2014-10-10 | 2016-04-14 | Jfeスチール株式会社 | 王冠用鋼板およびその製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH0741903A (ja) * | 1993-08-02 | 1995-02-10 | Nippon Steel Corp | 加工性に優れ異方性の小さい深絞り用熱延鋼板およびその製造方法 |
JPH10280089A (ja) * | 1997-04-03 | 1998-10-20 | Kawasaki Steel Corp | 2ピース変形缶用鋼板および2ピース変形缶体、ならびにそれらの製造方法 |
JP2005200751A (ja) * | 2004-01-19 | 2005-07-28 | Jfe Steel Kk | 耐二次加工脆性およびめっき密着性に優れた高成形性燃料タンク用めっき熱延鋼板およびその製造方法 |
JP2016079505A (ja) * | 2014-10-10 | 2016-05-16 | Jfeスチール株式会社 | 王冠用鋼板およびその製造方法 |
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