Grey Iron Castings Grey iron castings are cast in green sand and on bake mold processes. It has made its presence in a wide range of products used in automotives, aerospace and transportation industries. Known for its resistance to cracking and high temperatures, gray cast iron of high quality is brought to you in its best way by B.K.Castings. Grey Iron is the oldest form of cast iron and available in the most common way. The terms "cast iron" and "gray iron" are used interchangeably. Gray Iron named after its gray color appearance, consists of carbon that is in th