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Synopsis:To investigate the relation of the test piece positions and directions to the mechanical properties of a large sized steam turbine rotor shaft, the authors examined the impact transition temperature and the creep rupture properties of the 1Cr-11/4Mo-1/4V steel high pressure turbine rotor shaft for a 125,000kW generator with varied positions of test pieces.As to the test piece positions, the impact transition temperature rises gradually from the outer part to the center, and the creep-rupture strength at the central portion is higher than that of the outer part because of slower cooling rate; this is in good agreement with other reports.Both the elongation and the reduction of area are higher at the outer portion than those of the central.

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