Title:
高強度マルテンサイト耐熱鋼とその製造方法及びその用途
Document Type and Number:
Japanese Patent JP4542490
Kind Code:
B2
Abstract:
A high-strength martensite heat resisting steel which has long-time creep rupture strength required for steam temperature condition of 600 - 630°C and toughness at room temperature, and which is suitable for use as a material of a steam turbine rotor shaft and as large-sized forged steel with an improvement of hot forgeability. A method of producing the steel and applications of the steel are also provided. The high-strength martensite heat resisting steel contains 0.05 - 0.20% by mass of C, 0.1% or less of Si, 0.05 - 0.6% of Mn, 0.1 - 0.6% of Ni, 9.0 - 12.0% of Cr, 0.20 - 0.65% of Mo, 2.0 - 3.0% of W, 0.1 - 0.3% of V, 2.0% or less of Co, 0.02 - 0.20% of Nb, 0.015% or less of B, 0.01 - 0.10% of N, and 0.015% or less of Al, (W/Mo) being 4.0 - 10.0.
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Inventors:
Keiji Kawanaka
Masahiko Arai
Yoda Hideo
Masahiko Arai
Yoda Hideo
Application Number:
JP2005283198A
Publication Date:
September 15, 2010
Filing Date:
September 29, 2005
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
C22C38/00; B21J5/00; B21K1/08; C21D6/00; C21D8/00; C21D9/28; C22C38/54; F01D5/06; F01D5/28; F01D9/02; F01D25/00; F02C7/00
Domestic Patent References:
| JP62103345A | ||||
| JP8176657A | ||||
| JP8225833A | ||||
| JP2002121654A | ||||
| JP7118811A | ||||
| JP2004359969A |
Attorney, Agent or Firm:
Yukihiko Takada