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Case Hardening Process - Carburising

Points : Carburising, Definition Definition ‘The steels usually chosen for carburizing are those with a relatively low carbon content such as SAE 1015, 1020, 1112, 2315, 3120. and 4615. There are, of course, other suitable steels. The exact choice of steel for a particular use depends on the core properties desired, ease of machining, availability, and perhaps other factors. Steels of higher carbon content may, of course, be carburized, but the core will become less tough as the carbon content is increased. The source of the carbon is usually either a solid “carburizing compound,” a hydrocarbon oil, or a gas such as methane. The solid carburizing compound may be as simple a material as simple a material as ordinary charcoal, but it is are commonly a prepared mixture of some form of some form of carbon with “energizers” blended with and bonded to the carbon particles. The carbon may be charcoal or pitch coke pellets; the most common energizer is barium carbonate, Ba CO3. An example of a compound is wood charcoal 80%-85% by weight, BaCO3 12%.-15%,CaCO3 1%-3%, Na2CO3 1%, the maximum charcoal pellet being limited to ½ to binder. Carbon may also be obtained from cyanide salts as in liquid carburizing.

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