Improving the Thermal Stability of Hot-Working Dies

摘要

By cyclic gas treatment in ammonia and in air, a composite surface layer with controlled structure may be formed on die steel. Thanks to the catalytic properties of the oxide film that appears, an extended multilayer region of chemical compounds is formed at its surface. That improves the erosion and crack resistance of the die steel, with corresponding increase in the life of hot-working dies by a factor of 2-2.5.