The meaning of the special class

There is no unified definition and concept for special steels. It is generally believed that special steels refer to steels with special chemical composition (alloying), produced by special processes, with special structures and properties, and capable of meeting special needs. Compared with ordinary steel, special steel has higher strength and toughness, physical properties, chemical properties, biocompatibility and process performance. (Guide: Screw product name in Chinese and English (Taiwan version) wire)

The definition of special steel in my country is relatively close to Japan and the European Union. Special steel is divided into three categories: high-quality carbon steel, alloy steel, and high-alloy steel (alloying elements greater than 10%) 70% of the output of special steel. The main steel types are excellent, special carbon structural steel, carbon tool steel, carbon spring steel, alloy spring steel, alloy structural steel, ball bearing steel, alloy tool steel, high alloy tool steel, high-speed tool steel, stainless steel, heat-resistant steel , And high-temperature alloys, precision alloys, electric heating alloys, etc. At present, there are nearly 2,000 special steel grades and about 50,000 varieties and specifications in the world. In addition to a wide variety of special steels, the specifications also show different characteristics from ordinary steels. In addition to plates, tubes, wires, ribbons, rods and profiled materials, there are also composite materials, surface alloying materials, surface treatment materials, precision forging materials, precision castings, powder metallurgy products, etc.

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