In order to improve the mechanical properties, in particular hardness of the product can be divided into two groups.• The Case Hardening: hardness that feature is how to add skin treatments with low carbon steel group. At a temperature above the temperature of the steel structure is approximately 900 oc nanai or Australia in a friendly atmosphere with high carbon to make carbon diffuses into the surface (usually LPG gas to create the atmosphere of high-carbon) from the hardening by cold temperatures, oil samples 90 oc and at a temperature of 250-400 oc Tempering, then let cool in air products will have a high surface hardness of approx. 400 HV.• Features: the Quenching hardness of the product by using screw moderate to high carbon steel group. The baking temperatures, then let cool in 900 oc oil temperature 90 oc and Tempering temperature of 250-400 oc, then let cool in air, the product will have a high surface hardness, and will have a higher strength properties.
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