Rotor shaft and manufacturing method thereof

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

F - Mech Eng,Light,Heat,Weapons

16

C

64/1, 26/151, 17

F16C 3/02 (2006.01) B23P 11/02 (2006.01) C21D 9/14 (2006.01) C21D 9/38 (2006.01)

Patent

CA 1202495

- 1 - Abstract The invention provides a rotor shaft for steam turbines which has a journal portion to be supported by a bearing. The journal portion is provided with a bearing sleeve 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 a yield strength of more than 50 kg/mm2 and an Lt of less than 24. The sleeve is divided into two semicylindrical seg- ments, and they are arranged on a small diameter portion of the shaft adjacent to said journal portion, welded into one piece, and subjected to a stress relief treatment at a temperature higher than the temperature of a tempering treatment applied to the sleeve before welding. The welded sleeve is fitted on the journal portion by shrink- fit and serves as a superior bearing.

421145

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