Steam turbine rotor for high temperature

Details Steam turbine rotor for high temperature Steam turbine rotor for high temperature

1988-05-31

1990-04-17

Yee, Deborah

Metal treatment

Stock

Ferrous

148335, 148334, 420 69, C22C 3822, C22C 3824

Patent

active

049177389

ABSTRACT:
The present invention is directed to a steam turbine rotor which comprises an iron base alloy containing 0.05 to 0.2 wt % of carbon, 0.1 wt % or less of silicon, 0.05 to 1.5 wt % of manganese, more than 8.0 wt % to less than 13 wt % of chromium, less than 1.5 wt % of nickel, 0.1 to 0.3 wt % of vanadium, 0.01 to 0.1 wt % of niobium, 0.01 to 0.1 wt % of nitrogen, 0.02 wt % or less of aluminum, less than 0.50 wt % of molybdenum and 0.9 to 3.0 wt % of tungsten; contents of molybdenum Mo and tungsten W satisfying the following formulae

REFERENCES:
patent: 2853410 (1958-09-01), Lula
patent: 2905577 (1959-09-01), Harris et al.
patent: 4404041 (1983-09-01), Takahori et al.
patent: 4440024 (1983-11-01), Siga et al.
patent: 4477280 (1984-10-01), Shiga et al.

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