发明名称 |
process for producing extra high tensile steel having excellent stress corrosion cracking resistance. |
摘要 |
An extra high tensile steel having an excellent stress corrosion cracking resistance in sea water and a yield strength of 1080 MPa or more is provided. A slab comprising, in terms of % by weight, 0.04 to 0.09% of C, 0.01 to 0.10% of Si, 0.05 to 0.65% of Mn, 8.0 to 11.0% of Ni, 0.5 to 1.5% of Mo, 0.2 to 1.5% of Cr, 0.02 to 0.20% of V and 0.01 to 0.08% of Al with the balance consisting of iron and unavoidable impurities is heated to a temperature between 1000 DEG C and 1250 DEG C, hot-rolled at a temperature of Ar' point or above, air-cooled, reheated at a rate of 120 DEG C/min or less to a temperature region of from (Ac3 point - 40 DEG C) to (Ac3 point + 40 DEG C), quenched and subsequently tempered at a temperature of the Ac1 point or below. <IMAGE> |
申请公布号 |
EP0651059(A1) |
申请公布日期 |
1995.05.03 |
申请号 |
EP19930117410 |
申请日期 |
1993.10.27 |
申请人 |
NIPPON STEEL CORPORATION;KAWASAKI STEEL CORPORATION |
发明人 |
OKAMURA, YOSHIHIRO, C/O NIPPON STEEL CORPORATION;YAMABA, RYOTA, C/O NIPPON STEEL CORPORATION;KOSEKI, TOMOYA, C/O KAWASAKI STEEL CORPORATION;NAKAGAWA, ICHIRO, C/O KAWASAKI STEEL CORPORATION |
分类号 |
C21D1/18;C21D6/00;C21D8/02;C22C38/08 |
主分类号 |
C21D1/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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