G222 700℃級蒸気タービン用材料の開発と機械的特性(OS7 高温・高効率発電)

概要

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Advanced Ultra Super Critical (A-USC) power plants with 46% power generation efficiency can contribute to substantial reductions in CO2 emissions. The operating steam temperature of A-USC is over 700℃, nickel based alloy will be used in high temperature components. In this paper, the activity and status of A-USC was described, focusing on materials development. The high pressure (HP) rotor and intermediate pressure (IP) rotor will be made of the welded materials of nickel based forging alloy and ferritic steel. In order to achieve both high creep strength and productivity of ton class, TOS1X had been developed by modification of Inconel alloy 617. Toshiba also has developed TOS1X-II that has higher proof stress than TOS1X. Chemical composition and mechanical properties of TOS1X-II will be described. The nickel based casting alloy for turbine casing or steam valve are now under evaluation, the estimation status of candidate materials was also shown in this paper.
一般社団法人日本機械学会の論文
2011-06-22