Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1989-05-16
1991-04-16
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420109, 148325, 148335, 60909, 416241R, C22C 3844
Patent
active
050080725
ABSTRACT:
A heat resistant steel of the present invention contains 0.05 to 0.2 wt. % of C, less than 0.5 wt. % of Si, less than 0.6 wt. % of Mn, 8 to 13 wt. % of Cr, 1.5 to 3 wt. % of Mo, 2 to 3 wt. % of Ni, 0.05 to 0.3 wt. % of V, 0.02 to 0.2 wt. % in total of either or both of Nb and Ta, 0.02 to 0.1 wt. % of N and the balance substantially Fe. Since a gas turbine of the present invention is constituted by members, such as discs, blades, shafts and so forth, made of alloys of this kind, the gas turbine has a structure in which it is possible to achieve a high level of creep rupture strength and Charpy impact value.
Fukui Yutaka
Hiraga Ryo
Iijima Katsumi
Iizuka Nobuyuki
Kuriyama Mitsuo
Hitachi , Ltd.
Yee Deborah
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