Case Hardening & Applications


Our Case Hardening and Application processes increase strength and wear resistance by diffusing carbon, through a number of different methods, into the surface of steel parts. This creates a casing around the material while retaining a substantially lesser hardness inside the core.

At SST, we’re experts when it comes to steel heat treatments such as this. These intricate processes are applied to low carbon steel parts after machining, as well as high alloy steel bearings, gears and other crucial components. Find out more about how our Case Application heat treating can benefit your business.

Gas Carburize

A case hardening process in which carbon is absorbed and diffused in the surface layer of a solid ferrous alloy. It is then quenched and tempered enabling the surface layer to be hardened.

Learn more about gas carburizing. 

Vacuum Carburize

A gas carburizing process in which steel is austenitized in a vacuum, carburized in a partial pressure of hydrocarbon gas, diffused in vacuum, then quenched in gas or oil.

Gas Nitride

Gas Nitriding is a case-hardening process that introduces nitrogen into the surface layer of steel parts using disassociated ammonia resulting in increased wear resistance and surface hardness


A case hardening process in which steel is heated above the lower transformation temperature in a gaseous atmosphere, causing carbon and nitrogen to be simultaneously absorbed by the surface, increasing wear resistance and surface hardness.

Featured Customers

  • Bell helicopter
  • Boeing
  • Nasa
  • Sikorsky

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