Carburizing — A process that causes absorption and diffusion of carbon into solid ferrous alloys by heating the material to temperatures usually above the transformation temp of the alloy, 1550 to 1750-degrees F. Processing takes place in a carbonaceous environment. The result is the diffusion of carbon into the material surface to the specified depth, resulting in a hardened surface that is completed by quenching from the carburizing temperature or by cooling to room temperature; then reaustenitizing and quenching. After quenching, the high-carbon exterior becomes harder, while the low- carbon core remains softer. This process requires tight controls on gas composition, temperature uniformity, and atmosphere circulation.
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