Compared with ordinary steel, special steel has higher strength and toughness, physical properties, chemical properties, biocompatibility, and process performance.

Compared with ordinary steel, special steel has characteristics such as high purity, high uniformity, ultrafine structure, and high precision.

There are nearly 2000 special steel grades and approximately 50000 varieties and specifications in the world. In addition to a wide variety of special steels, they also exhibit different characteristics from ordinary steels in terms of specifications. In addition to plates, pipes, wires, strips, rods, and profiles, there are also composite materials, surface alloying materials, surface treatment materials, precision forging materials, precision castings, powder metallurgy products, etc.

The steel grade, abbreviated as steel grade, is the name given to each specific steel product and a common language for people to understand steel. The representation method for steel grades in China is based on the national standard "Method for the Representation of Steel Product Grades" (GB221-79), which uses a combination of Chinese pinyin letters, chemical element symbols, and Arabic numerals. Namely: ① The chemical elements in the steel grade are represented by international chemical symbols, such as Si, Mn, Cr, etc. Mixed rare earth elements are represented by "RE" (or "Xt") The product name, purpose, smelting and pouring method, etc. are generally represented by abbreviated letters in Chinese Pinyin The main chemical element content (%) in steel is expressed in Arabic numerals.