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 The spring steel is the material of the main structural components designed to create a variety of springs and elastic components or similar performance requirements. 



 A. ① high elastic limit σe and yield performance requirements σs of / σb to ensure excellent elastic properties, and to absorb a large amount of flexibility can not produce plastic deformation; ② high fatigue limit, fatigue is the spring the most important failure modes of fatigue performance addition to the related to the composition of the steel structure, mainly by the metallurgical quality of the steel (such as non-metallic inclusions) and spring surface quality (such as decarburization); ③ sufficient ductility and toughness in order to prevent impact fracture; ④ Other properties, such as heat treatment and plastic processing performance, the special conditions of heat resistance or corrosion resistance requirements. 













 Spring steel heat treatment of steel: 



 Spring steel heat treatment depends on the processing of the spring forming method, generally can be divided into forming hot springs and cold forming two spring classes: 1) hot forming spring section size> 10mm spring of a variety of large and complex shape using hot forming ( such as hot-rolled, hot rolled), such as automobiles, tractors, trains leaf spring and coil spring. Concise processing line as follows: flat or round material → heat bending or winding → quenching-tempering → surface shot peening treatment, the use of the state organization's body tempering care. Shot peening can enhance the surface and improve the quality of spring surface, significantly improved fatigue properties. 2) cold forming spring-section size of <10mm variety of small springs can be used for cold forming (such as cold rolled, cold rolled), such as instrument in the coil spring, spring and spring. The first cold pull (cold), quenching temperature tempering or lead bath temperature after quenching, cold drawn (rolled) to strengthen the forming of such spring; then cold forming, this process will further strengthen the metal, but also produced large internal stresses and brittle, so in the following should be carried out low temperature stress relief annealing (typically 200 to 400 ° C).