It is understood that there are about 40,000 varieties and millions of kinds of fasteners in various formats in and out of China, and their use situations and environment are ever-changing. Such as: Industrial profile fittings as the host, parts of the connector, and the host together with the main performance of the main components of the basic functions of the various requirements, must adapt to high temperatures. high pressure. Low temperature. shock. Corrosion, heavy load, alternating stress, shear and anti-twist, and other occasions. However, the probability of accidents caused by fastener failure is very high, so the materials used to make fasteners must be carefully selected in advance.

Many domestic fastener companies suffer from high customer claims due to product quality problems. It is true that many quality problems are caused by unqualified materials. How to correctly select fastener materials becomes one of the topics that fastener companies are increasingly concerned about.

Regarding the status quo and existing problems of fastener steel in China, Shen Gong, a material consultant for Fastener Professional Association of China Machinery General Components Industry Association, stated that although China is currently a fastener producing country, it is also the world's largest producer of steel. However, the development of fastener steel has started late. The specifications of cold heading steel are relatively small and cannot meet the current domestic demand for fastener production and the demand for exports. Many steel grades in G3506, G3507, G4105, and ASTM are also used in the production and market circulation of cold heading steels.