发明名称 |
WELDED STEEL PIPE HAVING EXCELLENT HYDROFORMABILITY AND METHOD FOR MAKING THE SAME |
摘要 |
A welded steel pipe is formed by heating or soaking an untreated welded stee l pipe having a steel composition containing, on the basis of mass percent: about 0.03% to about 0.296 C, about 2.0% or less of Si, not less than about 1.0% to about 1.5% Mn , about 0.1% or less of P, about 0.01 or less of S, about 1.0% or less of Cr, about 0.196 or less of Al, about 0.1% or less of Nb, about 0.1 % or less of Ti, about 0.1% or less of V, and about 0.01% or less of N; and by reduction-rolling the treated steel pipe at a cumulative reduction rate of at least about 35% and a final rolling temperature of about 500,degree.C to about 900.degree.C. The welded steel pipe exhibits excellent hydroformability, i.e., has a tensile strength of at least about 590 MPa and an n~r product of at least about 0.22. The treated steel pipe is preferably reduction-rolled at a cumulative reduction rate of at least about 20% below the Ar3 transformation point. |
申请公布号 |
CA2388480(A1) |
申请公布日期 |
2002.11.30 |
申请号 |
CA20022388480 |
申请日期 |
2002.05.31 |
申请人 |
KAWASAKI STEEL CORPORATION |
发明人 |
OKABE, TAKATOSHI;HASHIMOTO, YUJI;TOYOOKA, TAKAAKI;ARATANI, MASATOSHI;KAWABATA, YOSHIKAZU;YORIFUJI, AKIRA;KIMURA, MITSUO;NAGAHAMA, TAKUYA |
分类号 |
C22C38/00;B21B3/02;B21B17/14;B21B45/00;B21C37/06;B21D26/039;B21D26/043;B21D26/047;C21D8/10;(IPC1-7):F16L9/02;B21D26/02;B21B23/00 |
主分类号 |
C22C38/00 |
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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