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Title:
高強度非調質継目無鋼管の製造方法
Document Type and Number:
Japanese Patent JP4259347
Kind Code:
B2
Abstract:
A non-heat treated seamless steel pipe comprising, by weight, C: 0.10 to 0.25%, Si: 0.05 to 1.00%, Mn: 0.50 to 2.50%, P: not more than 0.03%, S: not more than 0.05%, Cr: 0.40 to 1.50%, Mo: 0.05 to 1.50%, V: 0.02 to 0.30%, Al: 0.003 to 0.10%, B: 0.0003 to 0.01%, and N: 0.001 to 0.02%, in which the balance comprises Fe and impurities. According to this non-heat treated seamless steel pipe, a ferrite area ratio is not more than 10%, and a carbon equivalent Ceq. (%) defined by the following equation is 0.45 to 0.85%. Ceq.=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15

Inventors:
Makoto Sakamoto
Application Number:
JP2004043279A
Publication Date:
April 30, 2009
Filing Date:
February 19, 2004
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21D8/10; B21B19/10; C21D7/13; C21D9/08; C22C38/00; C22C38/22; C22C38/32; C22C38/38; C22C38/42; C22C38/54; C22C38/58
Domestic Patent References:
JP59083719A
JP2001262275A
JP5202447A
Attorney, Agent or Firm:
Hidehiko Ito
Morishita Hachiro
Hiroyuki Yoshida