1, carbon spring steel
The carbon content (mass fraction) of carbon spring steel is generally 0.62%~0.90%. According to its manganese content, it can be divided into general manganese content (mass fraction) (0.50%~0.80%) such as 65, 70, 85 and higher manganese content (mass fraction) (0.90~ 1.20%) such as 65Mn.
2. Alloy spring steel
Alloy spring steel is based on carbon steel. By adding one or several alloying elements properly, the mechanical properties and hardenability of steel are improved to meet the requirements of manufacturing various springs.
Performance requirements of spring steel
Springs are used under impact, vibration or long-term stress, so spring steel is required to have high tensile strength, elastic limit and high fatigue strength. Technically, spring steel is required to have certain hardenability, not easy to decarburize and good surface quality, that is, high-quality carbon structural steel with carbon content of 0.6%-0.9%.
Alloy spring steel is mainly Si-Mn series steel with slightly lower carbon content, and its properties are mainly improved by increasing the silicon content Wsi. In addition, there are permanent, tungsten and vanadium alloy spring steels ... In recent years, combined with China's resources and according to the requirements of new technology for automobile and tractor design, a new steel grade with boron, niobium and molybdenum added has been developed on the basis of silicon manganese steel, which has prolonged the service life of springs and improved their quality.
Refer to the above? Baidu encyclopedia-spring steel