Low-activation martensitic heat-resistant steel with oxidation resistance and liquid lead-bismuth corrosion resistance

The invention aims to provide a low-activation martensitic heat-resistant steel with oxidation resistance and liquid lead-bismuth corrosion resistance. The heat-resistant steel comprises the following alloy elements in percentage by mass: C not less than 0.09% and not more than 0.12%, Cr not less than 8.8% and not more than 9.2%, W not less than 1.48% and not more than 1.54%, V not less than 0.17% and not more than 0.23%, Ta not less than 0.12% and not more than 0.16%, Mn not less than 0.48% and not more than 0.50%, Si not less than 0.40% and not more than 0.80%, N less than 0.010%, Al less than 0.010%, Ni less than 0.005%, Mo less than 0.005%, Nb less than 0.010%, Co less than 0.005%, Ti less than 0.010%, Cu less than 0.010%, O less than 0.005%, P less than 0.005%, S less than 0.005%, and a matrix being Fe. The heat-resistant steel has excellent mechanical performance, high-temperature characteristic, oxidation resistance and liquid metal corrosion resistance.