Spring shock, vibration or long-term use of alternating stress, so the requirements of spring steel with high tensile strength, elastic limit, high fatigue strength. In the process of spring steel requires a certain degree of hardenability, not easy decarburization, surface quality and so on.
Carbon spring steel, carbon steel wc quality range of 0.6% to 0.9% range of quality carbon structural steel (including normal and high manganese content). Alloy spring steel is mainly manganese-manganese steel, their carbon content is slightly lower, mainly by increasing the silicon content of WSi (1.3% ~ 2.8%) to improve performance; In addition to chromium, tungsten, vanadium alloy spring steel. In recent years, combined with our resources, and in accordance with the requirements of new technologies for automobile and tractor design, a new type of steel with boron, niobium, molybdenum and other elements added to the silicon manganese steel has been extended to prolong the service life of the spring and improve the spring quality .