Abst:
Spring steel refers to special alloy steel for manufacturing various springs and other elastic elements. According to performance requirements and us
Spring steel refers to special alloy steel for manufacturing various springs and other elastic elements. According to performance requirements and use conditions, it can be divided into ordinary alloy spring steel and special alloy spring steel. Spring steel has excellent comprehensive properties, spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), precise shape and size.
Spring steel refers to steel specially used for manufacturing springs and elastic elements due to its elasticity in the quenched and tempered state. The elasticity of steel depends on its elastic deformation ability, that is, within the specified range, the elastic deformation ability makes it bear a certain load, and no permanent deformation occurs 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 properties (that is, elastic reduction resistance, also known as relaxation resistance), fatigue properties, 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), good surface quality (strict control of surface defects and decarburization), precise shape and size.
According to the GB/T 13304 "Steel Classification" standard, according to the basic performance and use characteristics 1, spring steel belongs to mechanical structural steel; according to the quality level, it belongs to special quality steel, that is, the steel that requires strict quality and performance control during the production process. . According to Chinese custom, spring steel belongs to special steel. When making spring steel, the technical requirements are relatively high. Excellent technology directly determines the level of quality.
The spring is used under impact, vibration or long-term cross stress, so spring steel is required to have high tensile strength, elastic limit, and high fatigue strength. In terms of technology, spring steel is required to have a certain degree of hardenability, not easy to decarburize, and good surface quality. Carbon spring steel is a high-quality carbon structural steel with a carbon content of WC in the range of 0.6%-0.9%. Alloy spring steels are mainly silico-manganese steel grades, their carbon content is slightly lower, and their performance is mainly improved by increasing the silicon content Wsi; in addition, there are alloy spring steels of 硌, tungsten, and vanadium. In recent years, combining Chinese resources and in accordance with the requirements of new technologies in automobile and tractor design, new steel grades with elements such as boron, niobium, and molybdenum added on the basis of silico-manganese steel have been developed to extend the service life of the spring and improve the quality of the spring. .
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