Heat-resisting cast steel

Details Heat-resisting cast steel Heat-resisting cast steel

1998-06-24

1999-12-07

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 37, C22C 3844, C22C 3852

Patent

active

059978066

ABSTRACT:
This invention provides a heat-resisting cast steel which is a high-Cr steel material having excellent high-temperature strength and hence suitable for use as a high-temperature steam turbine casing material capable of being used even at a steam temperature of 600.degree. C. or above. This heat-resisting cast steel contains, on a weight percentage basis, 0.07 to 0.15% carbon, 0.05 to 0.30% silicon, 0.1 to 1% manganese, 8 to 10% chromium, 0.01 to 0.2% nickel, 0.1 to 0.3% vanadium, a total of 0.01 to 0.2% niobium and tantalum, 0.1 to 0.7% molybdenum, 1 to 2.5% tungsten, 0.1 to 5% cobalt and 0.03 to 0.07% nitrogen, the balance being iron and incidental impurities.

REFERENCES:
patent: 5560788 (1996-10-01), Yamada et al.
patent: 5591391 (1997-01-01), Igarashi et al.
JP Abstract: Morinaga, et al., "Process for Prosucing Ferritic Iron-Base Alloy and Ferritic Heat Resistant Steel", WO 9601334 Jan. 1996.
JP Abstract; Makoto, et al., "High-Chromium Cast Steel for High Temperature Service Pressure Vessel", May 14, 1986.

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