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Compared with cast iron, steel has high strength, toughness and plasticity, and can be used to improve the mechanical properties and processing properties of the cast iron. The blank of steel parts can be obtained by forging, stamping, welding or casting, so the application is very extensive.

According to the use, steel can be divided into structural steel, tool steel and special steel. Structural steel is used in manufacturing all kinds of machinery parts and engineering structure component; tool steel is mainly used for making all kinds of cutting tools, tools and gauges; special steel (such as stainless steel, heat-resistant steel, acid resistant steel, etc.) used in the manufacturing of parts that work in the special environment. According to the chemical composition of steel, and can be divided into carbon steel and alloy steel. The properties of carbon steel mainly depends on the carbon content, the higher the carbon content Zegang strength is higher, but lower plasticity. In order to improve the performance of the steel, a number of alloy elements, especially the steel, are added.