metallic material
Metallic materials refer to materials with luster, ductility, easy conduction, heat transfer and other properties. Generally divided into two types: ferrous metals and non-ferrous metals. Ferrous metals include iron, chromium, manganese and so on. Among them, steel is the basic structural material, called the "industrial skeleton". Due to the advancement of science and technology and the wide application of various new chemical materials and new non-metallic materials, the number of substitutes for steel continues to increase, and the demand for steel is relatively declining.