Nickel-based alloy of nuclear power steam generator

The invention relates to a nickel-based alloy of a nuclear power steam generator. The invention can maintain or increase the alloy performance while reducing the alloy cost. The specific scheme of the invention is as follows: 1. a defined amount of rare earth elements are added in steel to have purification and metamorphism functions of deoxidizing, desulfurizing, changing the shape of inclusion and the like, have microalloy function in the alloy and finally increase the oxidation resistance, high temperature strength and plasticity, fatigue life, corrosion resistance, crack resistance and the like of the steel; 2. in view of the production cost, the content of the precious element nickel is needed to be as low as the lower limit under the premise of ensuring the processability and ensuring that the alloy can form the desired metallographic structure; 3. the content of chromium element is increased properly so as to increase the high temperature oxidation resistance and corrosion resistance of alloy; 4. the content of silicon element is adjusted so as to increase the tensile strength and corrosion resistance of alloy while the plasticity of alloy is ensured; and 5. the content of carbon is controlled and titanium element is added at the same time so as to further increase the oxidation resistance and corrosion resistance of steel.