Title:
継目無鋼管製造用素管とその製造方法
Document Type and Number:
Japanese Patent JP4311403
Kind Code:
B2
Abstract:
A pierced shell of an austenitic stainless steel having a good inner surface condition is provided, and a means is established which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainless steel. An austenitic stainless steel billet with a P content of at most 0.040 % and an S content of at most 0.020 % is pierced under conditions such that the pipe expansion ratio H (outer diameter of shell/diameter of billet to be worked) satisfies the following equation to obtain a tube shell of an austenitic stainless steel. { P €‰ ( % ) / ( 0.025 × H ˆ’ 0.01 ) } 2 + { S €‰ ( % ) / ( 0.015 × H ˆ’ 0.01 ) } 2 ‰¤ 1 When manufacturing a seamless steel pipe of an austenitic stainless steel, the above-described shell is rolled to form a pipe.
Inventors:
Kazumune Shimoda
Tomio Yamakawa
Junyuki Senba
Hirofumi Hori
Tsuneo Kondo
Tomio Yamakawa
Junyuki Senba
Hirofumi Hori
Tsuneo Kondo
Application Number:
JP2005507312A
Publication Date:
August 12, 2009
Filing Date:
June 22, 2004
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; C21D8/10; C22C38/00; C22C38/58; B21B3/02
Domestic Patent References:
JP60114554A | ||||
JP2001049400A | ||||
JP2000301212A | ||||
JP8004811B2 |
Attorney, Agent or Firm:
Shoichi Hirose