Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1999-01-26
2000-08-22
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 38, 148325, C22C 3844, C22C 3846
Patent
active
061067660
ABSTRACT:
A material for a gas turbine disk comprises 0.05 to 0.15 wt % of carbon, 0.10 wt % or less of silicon, 0.40 wt % or less of manganese, 9.0 to 12.0 wt % of chromium, 1.0 to 3.5 wt % of nickel, 0.50 to 0.90 wt % of molybdenum, 1.0 to 2.0 wt % of tungsten, 0.10 to 0.30 wt % of vanadium, 0.01 to 0.10 wt % of niobium, 0.01 to 0.05 wt % of nitrogen, and a remainder comprising iron and unavoidable impurities, wherein the contents of nickel, molybdenum and tungsten satisfy a relationship -1.5 wt %.ltoreq.Mo+W/2-Ni.ltoreq.0.7 wt %. Accordingly, unlike conventional gas turbine disk materials such as a heat resisting steel of 12Cr-type which can be used in an operation at about 400.degree. C., but has reduced toughness and high-temperature creep characteristics in an operation at about 500.degree. C., this material is allowed to have a satisfactory toughness and excellent high-temperature creep characteristics and can be suitably used at high temperatures.
Kadoya Yoshikuni
Kawai Hisataka
Magoshi Ryotaro
Takahashi Koji
Tsuchiyama Tomohiro
Kabushiki Kaisha Kobe Seiko Sho
Mitsubishi Heavy Industries Ltd.
Yee Deborah
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