Title:
METHOD FOR PRODUCTION OF MARTENSITIC STAINLESS STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2007/114246
Kind Code:
A1
Abstract:
Disclosed is a method for production of a martensitic stainless steel pipe having the following chemical composition (by mass): C: 0.15-0.22%; Si: 0.10-1.00%; Mn: 0.10-1.00%; Cr: 12.00-14.00%; N: 0.01-0.05%; P: 0.020% or less; and S: 0.010% or less, with the remainder being Fe and unavoidable impurities. After the martensitic stainless steel pipe is produced, the steel pipe is air-cooled until the temperature of the outer surface of the steel pipe becomes 135 to 175˚C, and the end part of the pipe is then cut. The crack sensitivity of the steel pipe can be reduced. By cutting the steel pipe at a temperature falling within a specific range, the cracking of the cut section can be prevented and the formation of burr can also be prevented.
Inventors:
SAITO KENICHI (JP)
Application Number:
PCT/JP2007/056853
Publication Date:
October 11, 2007
Filing Date:
March 29, 2007
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
SAITO KENICHI (JP)
SAITO KENICHI (JP)
International Classes:
C21D8/00; C21D8/10; C21D9/08; C22C38/00; C22C38/18; C22C38/54; B21B23/00
Domestic Patent References:
| WO2000070112A1 | 2000-11-23 |
Foreign References:
| JPH04107213A | 1992-04-08 | |||
| JPH042409A | 1992-01-07 | |||
| JPH042409A | 1992-01-07 |
Other References:
See also references of EP 2003215A4
Attorney, Agent or Firm:
SUGIOKA, Kanji et al. (Amagasaki Building 5-17-23, Higashinaniwa-cho, Amagasaki-sh, Hyogo 92, JP)
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