Metal treatment – Stock – Ferrous
Patent
1987-01-30
1988-08-09
Brody, Christopher W.
Metal treatment
Stock
Ferrous
148334, 420 68, 420105, C22C 3822
Patent
active
047625775
ABSTRACT:
Forgings fabricated from 9 Chromium - 1 Molybdenum, modified alloys are subjected to tempering at a temperature less than the ASTM specified minimum tempering temperature in the range from about 1275.degree. F. to about 1300.degree. F. for a period of time in the range of from about 5 to about 20 hours to cause the forging to have a room temperature yield strength in the range from about 85 to about 100 ksi. Such room temperature yield strengths permit the use of the alloy in the fabrication of high-pressure steam turbine rotors. Forgings fabricated from such alloys possess excellent high-temperature properties and the same are also weldable to facilitate repair of rotors fabricated therefrom and to facilitate the fabrication of the rotor in the first instance by forming the rotor from smaller sections which may be welded together and subsequently tempered at a temperature in the range from about 1275.degree. F. to about 1300.degree. F.
REFERENCES:
patent: 3139337 (1964-06-01), Boyle et al.
patent: 4404041 (1983-09-01), Akahori et al.
patent: 4414024 (1983-11-01), Siga et al.
patent: 4477280 (1984-10-01), Shiga et al.
patent: 4564392 (1986-01-01), Ohhashi et al.
Brody Christopher W.
Westinghouse Electric Corp.
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