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PRODUCTION HEAT TREATMENT in more detail…..
CASE HARDENING is a generic term generally used to describe Carburising or Carbonitriding of steel, to product a component with a tough core and hard surface. Carbonitriding is used on low grade steels such as 'mild steel' where iron nitrides are formed to achieve a high surface hardness.
NEUTRAL HARDENING is best defined by breaking down the name. Hardening of steel occurs by heating the steel within austenitising range applicable to the particular grade, then cooling rapidly enough to transform the structure to martensite. Broadly speaking the amount of carbon in the steel controls the level of hardness achievable, while the level of alloying elements such as chrome and boron dictate the depth of hardening.
AUSTEMPERING of spring steel is the isothermal transformation of steel at a temperature above that of martensite formation. The resultant structure is referred to as "bainite". We operate two types of continuous Austemper furnaces allowing heat treatment to be tailored to best suit the product.
TUFFTRIDING is a proprietary low temperature surface hardening process. The components are placed in a heated salt bath where a reaction takes place between the salt melt and the surface of the components. During the reaction nitrogen and carbon are absorbed and diffused. Tufftriding is similar to Nitriding but results in a far more ductile layer and is applicable to a wider range of materials. The layer reduces wear by not only increasing the surface hardness, but lowering the coefficient of friction.
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