Heat treatment strengthening technology of spring

In my country, the heat treatment of springs with wire less than 15mm, oil-quenched and tempered steel wire and toughened steel all use protective atmosphere heat treatment. Protective atmosphere heat treatment can eliminate surface decarburization and oxidation, and improve the surface quality of the material.
Protective atmosphere induction heating heat treatment is generally performed on the wire before the coil spring is formed. Some spring factories combine the heat treatment of the wire material with the spring production to reduce costs. The induction heating treatment has a good strengthening effect, and the induction heating speed is fast, which helps to refine the crystal grains and reduce surface decarburization, and can give full play to and improve the strength and toughness of the material.