What is Surface Hardening ?
Surface hardening or Case hardening is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material’s surface, forming a thin layer of a harder alloy.
Surface hardening is usually done after the part in question has been formed into its final shape, but can also be done to increase the hardening element content of bars to be used in a pattern welding or similar process. The term face hardening is also used to describe this technique, when discussing modern armour.
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