The demand of wear resistance and resistance to compression in the molds for plastics has had a considerable increase in recent years. The increase in the use of plastics enriched components and or additives that increase their resistance, associated with the study of finished more and more complex in shape and performance have led to the study and design of new steels for plastic molding.

Steels for hot pressing is required resistance to heat (450-600 ° C) is not continuous and insensitivity all’ingrossamento of the grain which is manifested when the steel is exposed for a long time at high temperatures.