In order to develop a new rotor forging, for compact designed larger steam turbine, which has higher mechanical properties than 1Cr-1Mo-0.25V rotor at elevated temperature, an investigation has been carried out on the mechanical properties and the uniformity of 12Cr-Mo-V-Ta-N model rotor and high and intermediate pressure rotor for 375 MW steam turbine.
12Cr-Mo-V-Ta-N rotor has better room temperature tensile strength and impact value than 1Cr-1Mo-0.25V rotor, in the part of shaft, body surface and body center. Creep rupture strength of 12Cr-Mo-V-Ta-N rotor, one of the most important properties, is also higher than 1Cr-1Mo-0.25V rotor and it uniformity is excellent.
It is expected that a newly developed 12Cr-Mo-V-Ta-N rotor with good mechanical properties andsoundness can be applicable for larger steam turbine.
