Common knowledge of metal materials Metal materials are the most widely used materials in our daily life and industry. It is mainly divided into steel, iron and non-ferrous metals and other types, and one of the steel is the most widely used materials, steel is the main component of iron, the rest of the man-made alloy elements and a variety of impurities. It is because of the different types of alloying elements that are added in different quantities to form a variety of steel, such as ordinary carbon steel, stainless steel, alloy steel, etc., in these added elements, carbon C plays a very important role The