To ensure the safe and reliable operation of supercritical carbon dioxide (S-CO_2) power plant over a long period of time

referred to the material commonly used in traditional steam boiler

the material of S-CO_2 boiler is selected fromhigh temperature strength and corrosion characteristics. When CO_2 flows through the boiler

the temperature of CO_2 is high

the temperature difference between CO_2 and tube wall temperature is large

over the 30～50 ℃ of steam boiler. Then the grade of the heat-resistant steel has to be upgraded. However

requirements and methods for the material selection for steam boiler cannot be directly used for S-CO_2 boiler. The feasibility of heat-resistant steels such as T23

T91

T92

TP347HFG and Super304H used in S-CO_2 boilers is explored from using maturity and economic performance. The results show that for cooling wall

T91 could be selected at certain tube structure

but 12Cr1MoVG

T21 and T23 et al used in steam boiler could not be selected. For superheater

only austenitic steel TP347HFG and Super304H meet the material selection requirements at certain tube structure.