Wear-resistant diffusion coatings on steels for punching and coining dies

Conclusions

• 1. For punching and coining die parts the optimum combination of properties (high hardness of the base and wear resistance of the surface and sufficient core toughness) is obtained with a combination of chemicothermal and heat treatments (with water quenching of the container) only for Kh12M and KhVG steels (and primarily with use of carbide coatings).

• 2. The following processes are recommended: for Kh12M steel chemicothermal treatment in a container with a fusible seal at 1050°C for 5 h, water quenching of the container with the parts; for KhVG steel chemicothermal treatment in a container with a fusible seal at 1000°C for 5 h, furnace cooling of the container, austenitizing in the same sealed container at 850°C for 2 h, water quenching of the container with the parts.

• 3. For punching and coining dies (taking into consideration the proposed chemicothermal and heat treatment process) use of high-chromium type Kh12M steel is most desirable.