Production of a tappet made from hardenable steel comprises heat treating the tappet blank at a hardening temperature, placing in a salt bath, cooling, maintaining the temperature of the tappet in the bath, and quenching in water

摘要

Production of a tappet made from hardenable steel comprises initially forming the tappet blank and heat treating at a hardening temperature; placing in a salt bath; cooling to form a bainitic structure; maintaining the temperature of the tappet in the bath for 1.5-2.5 hours; and quenching in water to the ambient temperature. Preferred Features: The hardening temperature is 800-880 deg C. The tappet is held in the bath at 200-250 deg C.