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Decarb Line

When steel is heated to 700oC(1292oF) or higher, carbon content in the metal reacts with gases containing oxygen and hydrogen, resulting in the removal of the carbon. This results in softening of the metal, particularly at the surfaces in contact with the decarburizing gas.

The hardness of a metal is influenced by its carbon content. By removing hard carbide phases from steel, the surface softens and so is more prone to damage. Decarburization is an unwanted side-effect of heat treatment, but is important for many industrial applications such as the production of stainless steel or electrical steel.

During the carburization process, the surface of the steel is intentionally attacked by a chemical process. To maintain product quality, it is critical that the surface is accurately inspected to detect defects and flaws that may affect future performance of the steel.
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