Spring steel refers to the steel specially used for manufacturing springs and elastic elements due to its elasticity in the quenched and tempered state. Spring steel shall have excellent comprehensive properties, such as mechanical properties, elastic reduction resistance , fatigue performance, hardenability, physical and chemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). In order to meet the above performance requirements, spring steel has excellent metallurgical quality, good surface quality, and accurate shape and size. Spring steel has a wide range of applications and market demands in aviation, automobiles, rail transit, electronics, machinery and many other fields.