Case hardening steels
Part of our range consists of hardenable steels specially intended for set hardening. It is a process where you thermochemically increase the carbon content of the surface of a low-carbon steel. The carbon content of the set hardening steel is usually around 0.2%. The carbon content is raised a bit below the surface of the steel by adding carbon to the atmosphere of the furnace, whereupon the carbon diffuses into the steel. The carburizing depth is controlled by temperature, carbon content in the atmosphere and holding time in the oven and is normally between 0.5 – 2 mm. In the charred layer, the carbon content is normally around 0.7 – 0.9% carbon.
The next step in the process is to quench and harden the steel to obtain a significantly stronger Martensite conversion in the charred surface layer. The result is a surface hardness around 58 – 65HRC. Seat curing does not need to be followed by a tempering. The hardness of the base material is controlled by the type of hardening steel chosen and the dimension of the hardened material.