Definition and performance of spring steel

Spring steel refers to steel specially used to manufacture springs and elastic elements due to its elasticity in the quenched and tempered state. The elasticity of steel depends on its ability to deform elastically, that is, the ability to deform elastically within a specified range Make it bear a certain load, and there will be no permanent deformation after the load is removed.

Spring steel should have excellent comprehensive properties, such as mechanical properties (especially elastic limit, strength limit, yield ratio), elastic reduction performance (that is, elastic reduction resistance, also known as relaxation 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 (high purity and uniformity) and good surface quality (strict surface control) Defects and decarburization), precise shape and size.

According to the “Steel Classification” standard, according to the basic performance and use characteristics, spring steel belongs to mechanical structural steel; according to the quality level, it belongs to special quality steel, that is, steel that requires strict quality and performance control during the production process. According to China’s custom , Spring steel belongs to special steel.