ROTOR SHAFT MADE OF CHROMIUM ALLOY STEEL

摘要

A steam turbine rotor shaft with a thrust runner, made of a chromium alloy steel having martensite structure and containing 8 to 14% by weight of chromium. The thrust receiving side of the thrust runner is covered by a thrust runner protecting plate made of a low alloy steel and divided in the circumferential direction into a plurality of segments. The segements are fixed by a suitable fixing means to the thrust receiving side of the thrust runner, and adjacent segments are jointed at their joint surfaces by welding to form a complete thrust runner protecting plate. It is thus possible to obtain a rotor shaft of chromium alloy steel having an improved bearing property regarding a thrust bearing.