发明名称 |
PRODUCTION METHOD FOR SEAMLESS STEEL PIPE USED IN LINE PIPE, AND SEAMLESS STEEL PIPE USED IN LINE PIPE |
摘要 |
Disclosed is a production method for seamless steel pipes used in line pipes, whereby the toughness of seamless steel pipes used in line pipes can be improved. A round billet having a chemical composition that includes, in mass%, 0.02 to 0.15% C, no more than 0.5% Si, and 0.5 to 2.5% Mn, with the remainder comprising Fe and impurities, is heated (S1). Rotary piercing is performed on the heated round billet to produce a blank tube (S2). The blank tube is rolled and the diameter thereof is fixed, thereby producing a seamless steel pipe (S3). The seamless steel pipe is cooled with water, and water cooling is halted when the temperature of the seamless steel pipe reaches 450°C or lower (S5). The cooled seamless steel pipe is quenched (S6). The quenched seamless steel pipe is tempered (S7). |
申请公布号 |
WO2011093117(A1) |
申请公布日期 |
2011.08.04 |
申请号 |
WO2011JP50174 |
申请日期 |
2011.01.07 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;HITOSHIO, KEISUKE;KONDO, KUNIO;ARAI, YUJI |
发明人 |
HITOSHIO, KEISUKE;KONDO, KUNIO;ARAI, YUJI |
分类号 |
C21D8/10;B21B23/00;C21D9/08;C22C38/00;C22C38/04;C22C38/58 |
主分类号 |
C21D8/10 |
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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