Title:
AUSTENITE-BASE STAINLESS STEEL PIPE, FOR BOILER, HAVING EXCELLENT HIGH-TEMPERATURE STEAM OXIDATION RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2008/023410
Kind Code:
A1
Abstract:
This invention provides an austenite-base stainless steel pipe, for a boiler, having excellent high-temperature steam oxidation resistance, which austenite-base stainless steel pipe is used in a superheater and a reheater in a heat power plant. In particular, the austenite-base stainless steel pipe for a boiler has a Cr content of 16 to 20% by weight and has a cold worked inner face. The content of Cr at a position near the inner surface of the steel pipe is not less than 14% by weight, and the hardness of a 100 μm position in the inner surface of the steel pipe is at least 1.5 times the average hardness of a parent metal, or a Hv hardness of not less than 300.
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Inventors:
MINAMI, Yusuke (())
南 雄介 (())
IIJIMA, Hitoshi (())
飯島 斉 (())
YOSHIDA, Motohisa (())
南 雄介 (())
IIJIMA, Hitoshi (())
飯島 斉 (())
YOSHIDA, Motohisa (())
Application Number:
JP2006/316453
Publication Date:
February 28, 2008
Filing Date:
August 23, 2006
Export Citation:
Assignee:
NKK TUBES (2-1 Ikegami-cho, Kawasaki-ku Kawasaki-sh, Kanagawa 64, 2100864, JP)
エヌケーケーシームレス鋼管株式会社 (〒64 神奈川県川崎市川崎区池上町２番１号 Kanagawa, 2100864, JP)
MINAMI, Yusuke (())
南 雄介 (())
IIJIMA, Hitoshi (())
飯島 斉 (())
エヌケーケーシームレス鋼管株式会社 (〒64 神奈川県川崎市川崎区池上町２番１号 Kanagawa, 2100864, JP)
MINAMI, Yusuke (())
南 雄介 (())
IIJIMA, Hitoshi (())
飯島 斉 (())
International Classes:
C21D8/10; B21B45/04; B24C1/10; C21D7/06; C23G3/04
Attorney, Agent or Firm:
TSUKUNI, Hajime (SVAX TS Bldg, 22-12 Toranomon 1-chome, Minato-k, Tokyo 01, 1050001, JP)
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