Heat-resistant steel for turbine blades and bolts and preparation method of heat-resistant steel

The heat-resistant steel comprises the following chemical elements in percentage by mass: 0.15 to 0.25 percent of C, less than or equal to 0.15 percent of Mn, 12.5 to 13.5 percent of Cr, 1.5 to 2.5 percent of Mo, 2.5 to 3.5 percent of W, 3 to 3.8 percent of Co, 0.1 to 0.4 percent of V, less than or equal to 0.2 percent of Ni, less than or equal to 0.02 percent of Al, 0.22 to 0.32 percent of Ti, less than or equal to 0.2 percent of Cu, 0.2 to 0.3 percent of Ta, 0.1 to 0.2 percent of Nb, 0.052 to 0.072 percent of N, 0.001 to 0.005 percent of B, 0.12 to 0.18 percent of Ce, less than or equal to 0.195 percent of impurities and the balance of Fe. The invention further provides a preparation method of the heat-resistant steel and application of the heat-resistant steel in the field of steam turbines. The heat-resistant steel provided by the invention can meet the use requirements of turbine blades and bolts with the working temperature not higher than 650 DEG C. 本发明提供了一种汽轮机叶片和螺栓用耐热钢，包括以下质量百分比的各化学元素：C：0.15-0.25％，Mn≤