NADCAP Certified; Syracuse Heat Treating has four Endothermic Furnaces, a Fluid Bed able to process parts up to 60" in length and eighteen Tempering Furnaces.
Oil hardening is a typical heat treatment process for mid to high carbon alloys. Hardening is the process of heating these alloys in a protective atmosphere to a specific temperature, then oil quenching. This process changes the material's structure partially or completely into a martensite. This structure will have the highest hardness (HRC) after quench but will be unstable and require tempering. The alloy must undergo tempering treatment after hardening in order to obtain high ductility and toughness.
Any temperature can be used for tempering, but it is the balance of hardness, strength, and toughness required in service that determines the final tempering temperature. Double tempering is sometimes performed to ensure completion of the tempering reaction and to promote stability of the resulting microstructure.