Title:
HEAT RESISTANT STEEL, GAS TURBINE OBTAINED BY USING THE SAME, AND VARIOUS MEMBER THEREOF
Document Type and Number:
Japanese Patent JP3921574
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a heat resistant steel which has high creep fracture strength to withstand higher temperatures and high toughness even after high temperature-long time heating, to provide a gas turbine obtained by using the same, and to provide various members thereof.
SOLUTION: The heat resistant steel consists of a martensitic steel comprising, by weight, 0.05 to 0.30% C, ≤0.50% Si, ≤0.60% Mn, 8.0 to 13.0% Cr, 0.5 to 3.0% Ni, 1.0 to 3.0 Mo, 0.1 to 1.5% W, 0.5 to 4% Co, 0.05 to 0.35% V, one or two kinds of metals selected from Nb and Ta by 0.02 to 0.30% in total and 0.02 to 0.10% N, and in which the value shown by the square of (the difference between the Ni content and the Co content) and the Ni content satisfy the value obtained by connecting each point of a point A (1.0, 2.7%) and a point B (2.5, 1.0%) or lower shown in fig.2, and the value shown by {the Mo content/(the Mo content+0.5W content)} is ≥0.5.
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Inventors:
Masahiko Arai
Keiji Kawanaka
Hiroyuki Doi
Takehara Isao
Hidetoshi Kuroki
Keiji Kawanaka
Hiroyuki Doi
Takehara Isao
Hidetoshi Kuroki
Application Number:
JP2003101401A
Publication Date:
May 30, 2007
Filing Date:
April 04, 2003
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
C22C38/00; F01D5/06; C22C38/44; C22C38/46; C22C38/52; C22C38/54; F01D5/28; F02C7/00; (IPC1-7): C22C38/00; C22C38/52; C22C38/54; F01D5/06; F01D5/28; F02C7/00
Domestic Patent References:
| JP11124657A | ||||
| JP2000204447A |
Attorney, Agent or Firm:
Yukihiko Takada