The spring is used under impact, vibration or long-term cross stress, so spring steel is required to have high tensile strength, elastic limit, and high fatigue strength. In the process, spring steel is required to have a certain degree of hardenability, not easy to decarburize, and good surface quality. Carbon spring steel is a high-quality carbon structural steel with a carbon content of WC in the range of 0.6%-0.9%.
Alloy spring steels are mainly silico-manganese steel grades, their carbon content is slightly lower, and their performance is mainly improved by increasing the silicon content Wsi; in addition, there are alloy spring steels of 硌, tungsten, and vanadium. In recent years, combining Chinese resources and in accordance with the requirements of new technologies in automobile and tractor design, new steel grades with elements such as boron, niobium, and molybdenum added on the basis of silico-manganese steel have been developed to extend the service life of the spring and improve the quality of the spring. .
