SK7 features and scope of application

SK7 material generally after quenching temperature tempering can obtain high elastic spring steel should have excellent comprehensive performance, such as mechanical properties (especially the elastic limit, ultimate strength, showed), play reduce resistance (namely the elasticity decreased resistance, also known as relaxation resistance), fatigue performance, hardenability, physical and chemical properties, heat resistant, low temperature resistance, oxidation resistance, corrosion resistance, etc.).In order to meet the performance requirements, spring steel has good metallurgical quality (high purity and uniformity), good surface quality, strictly control the surface defect and decarburization), accurate shape and size.Spring is used under impact, vibration or long-term stress, so it is required that spring steel has high tensile strength, elastic limit and high fatigue strength.In the process, the spring steel is required to be hardenable, difficult to decarbonize, surface quality and so on.Carbon spring steel is a high quality carbon steel in the range of 0.6% to 0.9%.The alloy spring steel is mainly silicon-manganese steel, and their carbon content is slightly lower, mainly by increasing the silica content Wsi to improve the performance.