Refining heat treatment process for eutectic carbide of cold work die steel

The invention discloses a cold work die steel eutectic carbide refining heat treatment process, and belongs to the technical field of cold work die steel heat treatment. The steel ingot or the steel billet is heated to 1160 DEG C to 1180 DEG C at the heating rate of 50 DEG C/h to 100 DEG C/h; according to the section size of the steel ingot or the steel billet, the heat preservation time is calculated and determined according to 0.08 h/(r, H/2), r is the radius of the steel ingot, and H is the thickness of the steel billet; after the heat preservation time is reached, cooling to 500 DEG C to room temperature along with the furnace, and discharging, or directly forging or rolling by red delivery; carbides of the cold work die steel are decomposed and crushed into small particles from large particles, and meanwhile the thermoplasticity is improved by 40% or above. The cold work die steel has the advantages that the cracking resistance, fracture resistance and fracture resistance of the cold work die steel are i