Heat resisting steel and steam turbine rotor shaft and method of

Details Heat resisting steel and steam turbine rotor shaft and method of Heat resisting steel and steam turbine rotor shaft and method of

1997-04-30

1999-06-15

Yee, Deborah

Metal treatment

Stock

Ferrous

148605, 148607, 148663, 420 36, C22C 3830, C21D 930, C21D 810

Patent

active

059118423

ABSTRACT:
A heat resisting steel whose metal structure is entirely martensite phase produced by tempering after quenching. The steel comprises, by weight, 0.05 to 0.20% C, not more than 0.15% Si, not more than 1.5% Mn, not more than 1.0% Ni, 8.5 to 13.0% Cr, not more than 3.50% Mo, not more than 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, not more than 5.0% Co, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen and 0.00001 to 0.0002% hydrogen. The steel has preferably not more than 10 of the Cr equivalent. The steel has 10 kgf/mm.sup.2 or more of 100,000 hours creep rupture strength at 650.degree. C.

REFERENCES:
patent: 4844755 (1989-07-01), Hashimoto et al.
patent: 4917738 (1990-04-01), Takano et al.
Key To Steels, 10 Edition 1974, Germany.
The Making, Shaping & Treating Steel, 10th Edition, 1985 p. 1287.

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