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AC HARDENING CO., LTD. (THAILAND) Heat treatment is a controlled process used to alter the microstructure of metals and alloys such as steel and aluminium to impart properties which benefit the working life of a component, for example increased surface hardness, temperature resistance, ductility and strength.  Difference between Carburizing and Through Hardening. Carburizing is a surface or case hardening process normally applied to low-carbon steel alloys. During processing, carbon is diffused into the surface of the parts at elevated temperatures. Hardening occurs to this "carburized case" by quenching in oil from above the transformation range resulting in a hard surface for wear resistance and a soft core for ductility. Through Hardening is for hardening medium carbon alloy steel. This consists of heating the parts to a temperature above the transformation range and rapid cooling to room temperature, usually using an oil quench. This may be performed in air or in a controlled atmosphere to protect the part's surface. Parts are then reheated to a lower temperature to temper to the desired final hardness range. |
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