Steel use classification

　　Structural steel

　　(1) Construction and engineering structural steels are referred to as construction steels for short, which refer to steels used for making metal structural parts in buildings, bridges, ships, boilers or other projects. Such as carbon structural steel, low alloy steel, steel and other steel.

　　(2) Structural steel for machinery manufacturing refers to steel used for manufacturing structural components on machinery and equipment. This kind of steel is basically high-quality steel or high-quality steel, mainly high-quality carbon structural steel, alloy structural steel, easy-cut structural steel, spring steel, rolling bearing steel, etc.

　　Tool Steel

　　Generally used for manufacturing various tools, such as carbon tool steel, alloy tool steel, high-speed tool steel and so on. According to the use, it can be divided into cutting tool steel, die steel and measuring steel.

　　Special Steel

　　Steels with special properties, such as stainless acid-resistant steels, heat-resistant steels, high-resistance alloys, wear-resistant steels, magnets, etc.

　　Professional steel

　　This refers to steels for professional use in various industrial sectors, such as automotive steels, agricultural machinery steels, aviation steels, chemical machinery steels, boiler steels, electrical steels, electrode steels, and the like.

　　According to the quality of steel

　　High-quality carbon structural steel, alloy structural steel, carbon tool steel and alloy tool steel, spring steel, bearing steel, etc.

　　Behind the steel number, the symbol "A" or the Chinese character "high" is usually added for identification.