1) Forging process H 13 steel has high content of alloying elements, great deformation resistance during forging, and poor thermal conductivity of the material, and the crystallization temperature of * * * is low, which will overheat if it is not careful. Therefore, it should be preheated in the range of 800 ~ 900℃ and then heated to the initial forging temperature of1065 ~1175℃. In order to break large nonmetallic inclusions, eliminate carbide segregation, refine carbides and obtain uniform microstructure, upsetting and drawing should be repeated during forging, and the total forging ratio should be greater than 4. In the cooling process after forging, there is a tendency to produce quenching cracks, and it is easy to produce transverse cracks in the center. Therefore, H 13 steel should be cooled slowly after forging.

2) The surface roughness of cutting has a great influence on the thermal fatigue performance of the die. The surface of the mold cavity should have low surface roughness, and no tool marks, scratches and burrs can be left. These defects lead to stress concentration and induce thermal fatigue cracks.