Decarburisation
What is Decarburisation in Stainless Steel Processing?
Decarburisation in stainless steel is the removal of carbon from the surface layers of steel when exposed to high temperatures in the presence of gases like oxygen or hydrogen. This change happens during processes such as annealing or forging, where carbon diffuses out of the steel and reacts with the atmosphere.
Why Decarburization is Done in Stainless Steel Manufacturing
Decarburisation in stainless steel manufacturing depends on the desired properties of the final product. Removing excess carbon can improve corrosion resistance and reduce the risk of carbide precipitation. In some cases, controlled decarburization is used to produce soft surface layers for better machinability or formability.
Effects of Decarburisation on Stainless Steel Properties
Decarburisation lowers surface hardness and strength but can increase ductility. If not controlled, it can lead to uneven mechanical properties and reduced wear resistance. In stainless steel, excessive carbon loss can affect the passive layer, which protects against corrosion. Measuring the depth of decarburisation is important to check product quality, especially in components exposed to stress or wear.