Case Hardening

Jacob
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Case hardening produces a hard, wear-resistant sur- face or case over a strong, tough core. The principal  forms  of  casehardening  are  carburizing,  cyaniding,  and  nitriding.   Only  ferrous metals  are  case-hardened. Case hardening is ideal for parts that require a wear-resistant surface and must be tough enough interally to withstand  heavy  loading.  The steels best suited for case hardening are the low-carbon and low-alloy series. When high-carbon steels are case hardened, the hardness penetrates the core and causes brittleness. In case hardening, you change the surface of the metal  chemically by introducing a high carbide or nitride  content. The core remains chemically unaffected. When heat-treated, the high-carbon surface responds to hardening, and the core toughens.

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