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为满足设计大容量汽轮机机组,需要发展新的转子材料,这就要求材料在提高机组蒸汽温度的工作条件下,比1Cr—1Mo—1/4V钢材料有更高的机械性能。为此研究了用12Cr—Mo—V—Ta—N钢试制的模拟转子锻件和37.5万千瓦汽轮机高中压转子锻件的机械性能和质量均匀性。 12Cr—Mo—V—Ta—N转子材料钢在其转子轴部、本体表面和心部的室温抗拉强度、冲击值均比1Cr—1Mo—1/4V钢转子为佳。作为最重要性能之一的持久强度,12Cr—Mo—V—Ta—N钢也比1Cr—1Mo—1/4V钢高,此外锻件的质量均匀性极好。新研制的12Cr—Mo—V—Ta—N转子材料,具有优良的机械性能,且质量完好,有希望用于大型汽轮机生产上。
In order to meet the needs of designing large-capacity steam turbine units, new rotor materials need to be developed, which requires the material to have higher mechanical properties than 1Cr-1Mo-1 / 4V steel materials under the working conditions of increasing unit steam temperature. Therefore, the mechanical properties and quality uniformity of the simulated rotor forgings and the high-intermediate-pressure rotor forgings of 375 MW turbines trial-milled with 12Cr-Mo-V-Ta-N steel were studied. The room temperature tensile strength and impact value of 12Cr-Mo-V-Ta-N rotor steel are better than 1Cr-1Mo-1 / 4V steel rotors in the rotor shaft, body surface and core. The 12Cr-Mo-V-Ta-N steel is also superior to 1Cr-1Mo-1 / 4V steel as one of the most important properties of long-lasting strength. In addition, the quality of the forging is excellent. The newly developed 12Cr-Mo-V-Ta-N rotor material, with excellent mechanical properties, and good quality, promising for large steam turbine production.