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Title:
TUBE SHELL FOR MANUFACTURING SEAMLESS STEEL PIPE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2009082988
Kind Code:
A
Abstract:

To provide a pierced tube shell of an austenitic stainless steel having a good inner surface condition and to establish a means with which can perform mass production on an industrial scale of a good quality seamless steel pipe of stainless steel.

The austenitic stainless steel billet containing 0.040% P, 0.020% S and 13.00% Ni is pierced under conditions such that the pipe expansion ratio H (outer diameter of tube shell/diameter of the billet to be worked) satisfies the following equation of {P(%)/(0.025H-0.01)}2+{S(%)/(0.015H-0.01)}21, to obtain the tube shell of the austenitic stainless steel. When manufacturing a seamless steel pipe of the austenitic stainless steel, the above tube shell is rolled to form a pipe.


Inventors:
SHIMODA KAZUMUNE
YAMAKAWA TOMIO
SENBA MITSUYUKI
HORI HIROFUMI
KONDO TSUNEO
Application Number:
JP2008282064A
Publication Date:
April 23, 2009
Filing Date:
October 31, 2008
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B19/04; C21D8/10; C22C38/00; C22C38/58; B21B3/02
Domestic Patent References:
JPH084811B21996-01-24
JP2001049400A2001-02-20
Attorney, Agent or Firm:
Shoichi Hirose