Highly tenacious ferritic heat resisting steel

Details Highly tenacious ferritic heat resisting steel Highly tenacious ferritic heat resisting steel

1998-03-18

1999-08-31

Yee, Deborah

Metal treatment

Stock

Ferrous

148326, C22C 3844, C22C 3846

Patent

active

059449225

ABSTRACT:
The present invention discloses ferritic heat resisting steels for manufacturing a rotor or a disk of a gas turbine, which have high creep rupture strength at high temperatures and excellent tenacity at room ordinary temperatures. The highly tenacious ferritic heat resisting steels contain, by weight, carbon of 0.08 to 0.25%, silicon of 0.5% or lower, manganese of 1.0% or lower, nickel exceeding 1.0% and lower than 3.0%, chromium of 9.0 to 12.5%, molybdenum exceeding 0.3% and lower than 1.5%, tungsten of 1.0 to 3.0%, vanadium of 0.10 to 0.35%, niobium of 0.02 to 0.10%, nitrogen of 0.01 to 0.80%, boron of 0.001 to 0.01% and cobalt of 1.0 to 5.0%, and a remaining part is mostly iron. Its structure is composed of a tempered martensite matrix.

REFERENCES:
patent: 5779821 (1998-07-01), Ishii et al.
European Search Report for EP 98 10 4483 completed Jul. 7, 1998 by G. Badcock.

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