JP6792946B2 - 低降伏比を有する超高強靭鋼板及びその製造方法 - Google Patents
低降伏比を有する超高強靭鋼板及びその製造方法 Download PDFInfo
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Description
公開番号がWO2007/051080であり、公開日が2007年5月3日であり、発明の名称が「低降伏比、高靭性及び優れた溶接性を有する高強度二相鋼」である特許文献は、軟質相と硬質相の複合ミクロ構造を有する二相高強度鋼を公開し、その複合ミクロ構造は、低降伏比、高歪み成形能、優れた溶接性及び高靭性を提供でき、その化学成分は、C:0.03〜0.12%、Ni:0.1〜1.0%、Nb:0.005〜0.05%、Ti:0.005〜0.03%、Mo:0.1〜0.6%、Mn:0.5〜2.5%、Cu:≦1.0%、Cr:≦1.0%、Ca:≦0.01%を含み、更に任意の元素V:≦0.1%、B:≦0.002%、Mg:≦0.006%、N:≦0.010%、Si:≦0.5%、Cu:≦1.0%、Al:≦0.06%、P:≦0.015%、S:≦0.004%を含む。当該二相鋼は、主に細粒フェライトからなる第一相又は成分を約10体積%〜約60体積%含む。当該第一相は、平均結晶粒サイズが約5ミクロン又はその以下であるフェライトを有する。当該二相鋼は、更に第二相又は成分を約40体積%〜約90体積%含み、当該第二相又は成分は、細粒マルテンサイト、細粒下部ベイナイト、細粒粒状ベイナイト、細粒擬似上部ベイナイト又はそれらの任意の混合組織を含む。
C:0.18〜0.34%、
Si:0.10〜0.40%、
Mn:0.50〜1.40%、
Cr:0.20〜0.70%、
Mo:0.30〜0.90%、
Nb:0〜0.06%、
Ni:0.50〜2.40%、
V:0〜0.06%、
Ti:0.002〜0.04%、
Al:0.01〜0.08%、
B:0.0006〜0.0020%、
N≦0.0060%、
O≦0.0040%、
Ca:0〜0.0045%であり、
残部がFe及び他の不可避的不純物である。
下記工程で本発明に記載の低降伏比を有する超高強靭鋼板を製造する。
各化学元素の質量百分率含有量の配合比を具体的に表1に示したように制御する;
2)鋳造;
3)加熱:ビレットを1080〜1250℃に加熱する;
4)圧延:圧延後の鋼板を空冷し或いは水冷する;
5)冷却:室温まで冷却する;
6)焼入れ:焼入れ温度が860〜940℃であり、焼入れ後に水冷する;
7)焼戻し:焼戻し温度が150〜350℃であり、焼戻し後に空冷する。
Claims (8)
- 化学元素の質量百分率含有量が、
C:0.28〜0.34%、
Si:0.10〜0.20%、
Mn:0.50〜0.80%、
Cr:0.20〜0.40%、
Mo:0.50〜0.90%、
Nb:0〜0.02%、
Ni:0.90〜2.40%、
V:0.01〜0.04%、
Ti:0.002〜0.009%、
Al:0.01〜0.04%、
B:0.0006〜0.0010%、
N:0.003〜0.005%、
O:0.003〜0.0040%、
Ca:0.002〜0.0045%であり、
残部がFe及び他の不可避的不純物であることを特徴とする低降伏比を有する超高強靭鋼板であって、
前記鋼板は、降伏比が0.85未満であり、引張り強度が1610MPa以上であり、降伏強度が1320MPa以上であり、伸び率が10%よりも大きく、−20℃での衝撃エネルギーAkvが27Jよりも大きい、超高強靭鋼板。 - 炭素当量がCEV≦0.75%を満足し、かつ、炭素当量がCEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15であることを特徴とする、請求項1に記載の低降伏比を有する超高強靭鋼板。
- 微視組織がマルテンサイトと残留オーステナイトであることを特徴とする、請求項1又は2に記載の低降伏比を有する超高強靭鋼板。
- 溶錬、鋳造、加熱、圧延、冷却、焼入れ及び焼戻しの工程を含み、得られる鋼板の微視組織がマルテンサイトと残留オーステナイトであり;加熱工程において、ビレットを1080〜1250℃に加熱し;焼入れ工程において、焼入れ温度が860〜940℃であり;焼戻し工程において、焼戻し温度が150〜350℃であり、前記鋼板は、降伏比が0.85未満であり、引張り強度が1610MPa以上であり、降伏強度が1320MPa以上であり、伸び率が10%よりも大きく、−20℃での衝撃エネルギーAkvが27Jよりも大きいことを特徴とする、請求項1又は2に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 圧延後に鋼板を空冷し又は水冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 焼入れ後に鋼板を水冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 焼戻し後に鋼板を空冷することを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
- 炭素当量がCEV≦0.75%を満足し、かつ、炭素当量がCEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15であることを特徴とする、請求項4に記載の低降伏比を有する超高強靭鋼板の製造方法。
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| CN201310022288.8 | 2013-01-22 | ||
| CN201310022288.8A CN103060715B (zh) | 2013-01-22 | 2013-01-22 | 一种具有低屈服比的超高强韧钢板及其制造方法 |
| PCT/CN2013/090270 WO2014114159A1 (zh) | 2013-01-22 | 2013-12-24 | 一种具有低屈服比的超高强韧钢板及其制造方法 |
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| CN103060715B (zh) | 2013-01-22 | 2015-08-26 | 宝山钢铁股份有限公司 | 一种具有低屈服比的超高强韧钢板及其制造方法 |
| CN103233094B (zh) * | 2013-04-25 | 2015-05-13 | 浙江大江合金钢钢管有限公司 | 高强度合金钢的冶炼工艺 |
| US20140345756A1 (en) * | 2013-05-21 | 2014-11-27 | General Electric Company | Martensitic alloy component and process of forming a martensitic alloy component |
| CN104250710A (zh) * | 2013-06-28 | 2014-12-31 | 肖云兴 | 低合金多元素高强耐热钢及其制造方法 |
| CN103882332A (zh) * | 2014-03-12 | 2014-06-25 | 舞阳钢铁有限责任公司 | 1100MPa以上级低温回火型高强钢板及其生产方法 |
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| CN103060715A (zh) | 2013-04-24 |
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| EP2949775A1 (en) | 2015-12-02 |
| KR20150109462A (ko) | 2015-10-01 |
| CN103060715B (zh) | 2015-08-26 |
| EP2949775A4 (en) | 2016-09-07 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |