Process for producing high-and low-pressure integral-type turbin

Details Process for producing high-and low-pressure integral-type turbin Process for producing high-and low-pressure integral-type turbin

1995-12-21

1998-02-10

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148653, 148654, C21D 800

Patent

active

057164681

ABSTRACT:
A rotor forging composed of Cr--Mo--V type alloy based on iron is normalizing-treated at a temperature of from 1000 to 1150.degree. C., the temperature is maintained at 650.degree.-750.degree. C. on the way of cooling the temperature from the normalizing-treating temperature to pearlite transform the microstructure of the rotor forging, the portions of the rotor forging corresponding to a high pressure or middle pressure portion are quenched at 940.degree.-1020.degree. C. and the portion corresponding to the low pressure portion is quenched at 850.degree.-940.degree. C. after the heat treatment is carried out at 920.degree.-950.degree. C. once or more times, and the rotor forging is subjected to tempering at 550.degree.-700.degree. C. once or more times. A high creep strength at the high and middle pressure portions can be obtained and, at the same time, the toughness at the low pressure portion is drastically enhanced.

REFERENCES:
patent: 5108699 (1992-04-01), Bodnar et al.
patent: 5360318 (1994-11-01), Siga et al.

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