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In the past three decades,9~12%Cr ferritic/martensitic(such as T/P92,X20)and high alloyed austenitic steels(such as TP347,Super304H and HR3C)were widely used as heat exchangers in the boiler tube system of the ultra-supercritical power plants.These heat resistant steels used for the main structural materials in modern advanced fossil fired power plants should own a global properties of creep and corrosion resistance.