The invention belongs to the technical field of
alloy steel and particularly relates to a heat treatment method for high-temperature
alloy steel. The heat treatment method comprises the steps of a, a high-temperature
diffusion annealing process, wherein a high-temperature
alloy steel
ingot is heated for 22-26 h at the temperature of 1,150 plus or minus 10 DEG C, then heating is conducted for 70-74 h at the temperature of 1,190 plus or minus 10 DEG C, and then
air cooling is conducted; b, pretreatment after
forging, wherein the
heating temperature is 950 plus or minus 10 DEG C, the temperature is kept for 0.5-1.5 h, and then
air cooling is conducted; c, high-temperature
solid solution treatment, wherein the
heating temperature is 910 plus or minus 10 DEG C, the temperature is kept for 18-24 h, and then
air cooling is conducted; and reheating is conducted, the
heating temperature is 960 plus or minus 10 DEG C, the temperature is kept for 1-2 h, and air cooling is conducted; and d, low-temperature aging treatment, wherein the heating temperature is 710 plus or minus 10 DEG C, the temperature is kept for 7-10 h, then the temperature is decreased to 610 plus or minus 10 DEG C at the speed of 50-60 DEG C / h with furnace cooling, then the temperature is kept for 7-10 h, air cooling is conducted, and a
forging is obtained. By the adoption of the heat treatment method for the GH4169 high-temperature
alloy steel, the heating pretreatment after
forging, high-temperature
solid solution treatment and low-temperature aging treatment
thermal treatment process
system is adopted, the high-temperature
plasticity is good and the
creep resistance life is long.