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Title:
PRECIPITATION HARDENING BASED MARTENSITIC STAINLESS STEEL, STEAM TURBINE ROTOR BLADE AND STEAM TURBINE
Document Type and Number:
Japanese Patent JP2014201792
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a precipitation hardening based martensitic stainless steel having excellent stability of a structure, mechanical property and corrosion resistance, a steam turbine rotor blade using the same and a steam turbine using the same.SOLUTION: The precipitation hardening based martensitic stainless steel contains, by mass, C:0.1% or less, Cr:11 to 13%, Ni:10.5 to 11.5%, Al:0.25% or less, Ti:0.9 to 1.5%, Mo+0.5W:0.5 to 1.5%, Si:1.0% or less, Mn:1.0% or less, Mo/W (mass% ratio) of 0.4 to 0.6 and the balance iron with inevitable impurities.

Inventors:
OIKAWA SHINJI
ARAI MASAHIKO
DOI HIROYUKI
YODA HIDEO
Application Number:
JP2013079101A
Publication Date:
October 27, 2014
Filing Date:
April 05, 2013
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
C22C38/00; C21D9/00; C22C38/50; C22C38/60; F01D5/28; F01D25/00
Domestic Patent References:
JP2013001949A2013-01-07
JPS63134648A1988-06-07
JP2012102638A2012-05-31
JP2008546912A2008-12-25
Foreign References:
WO2012002208A12012-01-05
Attorney, Agent or Firm:
Polaire Intellectual Property Corporation



 
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