Login| Sign Up| Help| Contact|

Patent Searching and Data


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.

More Like This:
JP3265123WIRE ROD EXCELLENT IN MECHANICAL DESCALING PROPERTY AND ROD DRAWABILITY
Inventors:
MINAMI YUSUKE
IIJIMA HITOSHI
YOSHIDA MOTOHISA
FUKUI TOSHIHIKO
ONO TATSUO
Application Number:
PCT/JP2006/316453
Publication Date:
February 28, 2008
Filing Date:
August 23, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NKK TUBES (JP)
MINAMI YUSUKE
IIJIMA HITOSHI
YOSHIDA MOTOHISA
FUKUI TOSHIHIKO
ONO TATSUO
International Classes:
B21B45/04; C21D8/10; B24C1/10; C21D7/06; C23G3/04
Foreign References:
JPS5839733A1983-03-08
JPH02228468A1990-09-11
JPH06322489A1994-11-22
JPS53114722A1978-10-06
JPS54138814A1979-10-27
JPS5558329A1980-05-01
JPS5839733A1983-03-08
JPS49135822A1974-12-27
JPS528930A1977-01-24
Other References:
KAZUHIRO KANERO; YUSUKE MINAMI: "Mechanical Properties of Shot-blasted Stainless Steel Boiler Tubings", THERMAL AND NUCLEAR POWER ENGINEERING, vol. 30, no. 4, April 1979 (1979-04-01), pages 99 - 105
Attorney, Agent or Firm:
TSUKUNI, Hajime (22-12 Toranomon 1-chome, Minato-k, Tokyo 01, JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE

Next Patent: GARBAGE BIN AND LID FOR CONTAINER