Title:
耐高温水蒸気酸化性に優れたボイラ用オーステナイト系ステンレス鋼管
Document Type and Number:
Japanese Patent JP5108771
Kind Code:
B2
Abstract:
The present invention relates to an austenitic stainless steel tube for boiler, used for superheater or reheater in thermal power plant, giving excellent resistance to high temperature steam oxidation, in particular to an austenitic stainless steel tube containing 16 to 20% Cr by weight, and being cold-worked at the inner surface of the tube. The Cr concentration in the vicinity of the inner surface of the steel tube is 14% by weight or larger, and the hardness at 100 µm depth from the inner surface of the steel tube is 1.5 times or larger the average hardness of the mother material or is HV 300 or larger.
Inventors:
Yusuke Minami
Hitoshi Iijima
Motohisa Yoshida
Fukui Toshihiko
Tatsuo Ono
Hitoshi Iijima
Motohisa Yoshida
Fukui Toshihiko
Tatsuo Ono
Application Number:
JP2008530768A
Publication Date:
December 26, 2012
Filing Date:
August 23, 2006
Export Citation:
Assignee:
NKK Seamless Steel Pipe Co., Ltd.
International Classes:
C22C38/00; B24C1/10; C21D7/04; C21D7/06; C21D8/10; C22C38/40
Domestic Patent References:
| JPH01162786A | 1989-06-27 | |||
| JPS5839733A | 1983-03-08 | |||
| JPS6333549A | 1988-02-13 |
Attorney, Agent or Firm:
Hajime Tsukuni
Koshiro Tsukuda
Yasuo Yanagibashi
Koshiro Tsukuda
Yasuo Yanagibashi
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