Material Name: SUP12 spring steel Executive Standard: JIS G4801-2005 China Standard: GB / T 3077-1999 American Standard: A29M: 2005 ● Features and Scope: SUP12 has good mechanical properties and process performance, high hardenability, adding vanadium to steel, grain refining, reducing thermal sensitivity, improved strength and toughness, high fatigue strength, yield ratio is high, but the poor weldability, cold plastic deformation due to low. SUP12 is a relatively high spring, as large sections of the important spring and high load operating temperature <300 ℃ valve springs, piston spring, safety valve spring. Spring steel spring steel is hardened and tempered condition due to the elastic, and specifically for the manufacture of springs and elastic components of steel. Elasticity of steel depends on the elastic deformation capacity, that is within the predetermined range, the elastic deformation capacity to withstand a certain load, the load does not occur after the removal of permanent deformation. Spring steel should have excellent overall performance, such as mechanical properties (especially elastic limit, ultimate strength, yield ratio), reduced ballistic performance (ie, decreased resistance to elastic properties, also known as sag resistance), fatigue properties, hardenability physical and chemical properties (heat resistance, low temperature, oxidation, corrosion, etc.). To meet these performance requirements, the spring steel has excellent metallurgical quality (high purity and homogeneity), good surface quality (strict control of surface defects and decarburization), the exact shape and size.