Patent ID: 11951530
Assignee: CENTRAL IRON & STEEL RESEARCH INSTITUTE CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  G | IPC B  C  G

Claim 13:
14. The method of claim 13, wherein in step 2, the free forging comprises two upsettings and one drawing out, and is specifically conducted as follows:
subjecting the rotor stainless steel billet to a first upsetting to a diameter φ of 440-460 mm, a drawing out to a diameter φ of 350-380 mm, and then a second upsetting to a diameter φ of 440-460 mm, in which the free forging has an initial forging temperature of 1,140-1,170° C. and a finish forging temperature of not less than 900° C.; and
cooling the rotor stainless steel billet after the free forging in heap to a temperature of 300 ° C., dispersing and air-cooling to ambient temperature.