Non-metallic Inclusions

Non-metallic inclusions are chemical compounds and nonmetals that are present in steel and alloys. They are the product of chemical reactions, physical effects, and contamination that occurs during the melting and pouring process. These inclusions are categorized by origin as either endogenous or exogenous. Endogenous inclusions, also known as indigenous, occur within the metal and are the result of chemical reactions. These products precipitate during cooling and are typically very small. Exogenous inclusions are caused by the entrapment of nonmetals. Their size varies greatly and their source can include slag, dross, flux residues, and pieces of the mold.

Read more about Non-metallic Inclusions:  Sources of Inclusions Formation, Classification of Non-metallic Inclusions, Influence of Non-metallic Inclusions To The Properties of Steel and Alloys