Rotor shaft and manufacturing method thereof

Details Rotor shaft and manufacturing method thereof Rotor shaft and manufacturing method thereof

1983-02-04

1985-02-05

Stallard, W.

Metal treatment

Compositions

Heat treating

148 36, C21D 928

Patent

active

044976704

ABSTRACT:
A rotor shaft for steam turbines has a journal portion to be supported by a bearing. The journal portion is provided with a sleeve for a bearing made of an alloy of bainite structure comprising 0.04 to 0.35% C, 0.2 to 2% Mn, less than 1% Si, 0.5 to 3% Cr, less than 5% Ni, and less than 0.5% V, having yield strength of more than 50 kg/mm.sup.2 and Lt of less than 24. The sleeve is divided into two semicylindrical segments, and they are arranged on a small diameter portion of the shaft adjacent to said journal portion, welded into one piece, and subjected to stress relief treatment at a temperature higher than a temperature of tempering conducted to the sleeve before welding. The welded sleeve is fitted on the journal portion by shrink-fit so that the sleeve can be served as a superior bearing.

REFERENCES:
patent: 2858206 (1958-10-01), Boyce et al.
patent: 2876152 (1959-03-01), Jatczak
patent: 3954454 (1976-05-01), Shaw
patent: 4026727 (1977-05-01), Finkl et al.
patent: 4170497 (1979-10-01), Thomas et al.
patent: 4193823 (1980-03-01), Linne
patent: 4426162 (1984-01-01), Tsuchiya et al.

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