High strength 9%Cr-W ferritic heat resistant steel (ASME SA213 T92, KA-STABA29) was developed as the materials for high temperature application in USC plant with a temperature at 600°C and higher pressure than 25 MPa in steam conditions. The Gr.92 contains much W, and therefore, its creep property is attained by solute dragging of W on the dislocation gliding motion and also Nb and V forms concerning MX the precipitation strengthening mechanism. This material was installed as tertiary super heater of Tobata Co-operative Thermal Power Plant, and the plant had been operated about 15 years without any trouble. In this report, stability of several properties of ex-serviced Gr.92 steel was evaluated [1,2].

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