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电站汽轮机高中压转子世界各国大多数都采用CrMoV系钢制造。为了提高机组的热效率,电站机组已向着大容量高参数的方向发展,如仍采用CrMoV钢生产高中压转子则不利于经济合理的设计,特别是中压转子的材料强度就不富裕了。同时要求电站大锻件的尺寸和重量也相应愈来愈大,以及更大截面的淬透性和更高的使用性能。为此各国冶金工作者对12％Cr钢进行了大量试验研究工作,研制出12％Cr改良型耐热钢,用作高参数汽轮机高中压转子,并得到良好的机械性能和高温性能。此钢系目前正受到各国汽轮机制造者的重视,有的已用于大型电站汽轮机高中压转子。
High-pressure turbine steam turbine power plant Most countries in the world are made of CrMoV steel. In order to improve the thermal efficiency of the unit, power plant units have been moving towards large capacity and high parameters. For example, the production of high and medium pressure rotors still using CrMoV steel is unfavorable to the economical design, and the material strength of medium-pressure rotors in particular is not rich. At the same time require large power plant forgings size and weight are correspondingly larger and larger section of hardenability and higher performance. For this purpose, metallurgists in various countries carried out a large amount of experimental research on 12% Cr steel and developed a 12% Cr modified heat-resisting steel for high and medium pressure steam turbines with high parameters and obtained good mechanical properties and high-temperature properties. This steel is currently being the attention of turbine manufacturers in various countries, and some have been used for large high-pressure steam turbine turbine power station.