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1.现用转子材料的持久极限和开发目标对蒸汽温度为538℃及566℃的高压转子、中压转子的材料来说,1％Cr-1.25％Mo0.25％V钢(下面称CrMoV钢)得到了广泛采用。持久强度优于CrMoV钢的转子材料有:美国开发的添加Mo、V、Nb、N的12％Cr钢和日本开发的添加Mo、V、Ta、N的12％Cr钢。这些钢已在日本的70万千瓦和100万千瓦汽轮机中压转子,50～60万千瓦汽轮机高中压转子,蒸汽温度为566℃的大容量机组中使用,并已有十年以上的运行经验。
1. Endurance Limits and Development Goals of Present Rotor Materials For high-pressure rotor and medium-pressure rotors at steam temperatures of 538 ° C and 566 ° C, 1% Cr-1.25% Mo 0.25% V steel (hereinafter CrMoV steel ) Has been widely adopted. Rotor materials with longer lasting strength than CrMoV steels include 12% Cr steel with Mo, V, Nb, N added in the United States and 12% Cr steel with Mo, V, Ta, N added in Japan. These steels have been used in Japan’s 700,000 kilowatts and 1 million kilowatt steam turbine medium-pressure rotors, 500-600 kilowatt turbine high and medium pressure rotors, and steam temperatures of 566 ° C with more than 10 years of operating experience.