The terms “Case Hardening” or “Case” are generic terms that do not define the “Case Hardening Process” enough for RSTW to process your parts and material with a great deal of confidence. More specific terms defining the many different case hardening processes are needed on incoming Purchase Orders. Specific “Case Hardening Processes” are Carbonitriding, Carburizing, Gasious-Nitro Carburizing (formally known as Ferritic-Nitro Carburizing), Gas Nitriding, etc.