Stainless steel rods are mainly composed of iron, chromium, nickel and other elements. Among them, chromium is the key element to make stainless steel corrosion resistance, the general content is more than 12%, it can form a dense chromium oxide film on the surface of the steel, prevent the internal metal and the outside oxygen, water and other substances contact, thereby preventing rust. The addition of nickel helps to improve the toughness, ductility and corrosion resistance of stainless steel, so that stainless steel can maintain good performance in different environments.