Heat-resisting steel

Details Heat-resisting steel Heat-resisting steel

1998-06-23

1999-10-26

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 37, C22C 3822, C22C 3824

Patent

active

059722878

ABSTRACT:
Disclosed is a heat-resisting steel comprising 0.05 to 0.15% by weight of carbon, 0.01 to 0.1% by weight of silicon, 0.01 to 1% by weight of manganese, 8 to 11% by weight of chromium, 0.1 to 0.8% by weight of nickel, 0.1 to 0.3% by weight of vanadium, a total of 0.01 to 0.2% by weight of niobium and tantalum, 0.001 to 0.01% by weight of nitrogen, 0.01 to 0.5% by weight of molybdenum, 0.9 to 3.5% by weight of tungsten, 0.1 to 4.5% by weight of cobalt, 0.001 to 0.01% by weight of boron, and the balance being iron and incidental impurities, as well as other similar heat-resisting steels. Thus, this invention provides heat-resisting steels which are 12Cr steel-based materials having excellent high-temperature strength and can be used at steam temperatures of 593.degree. C. or above, and forged steel products such as steam turbine rotors for high-temperature use.

REFERENCES:
patent: 2905577 (1959-09-01), Harris et al.
patent: 3139337 (1964-06-01), Boyle et al.
patent: 5560788 (1996-10-01), Yamada et al.
patent: 5591391 (1997-01-01), Igarashi et al.

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