Heat Treatment Strengthening Technology Of Spring

1: Protective atmosphere heat treatment. In my country, protective atmosphere heat treatment is used for the heat treatment of springs with wires less than 15mm, oil quenched and tempered steel wires and toughened steel. Protective atmosphere heat treatment can eliminate surface decarburization and oxidation and improve the surface quality of materials.

2: Induction heating or protective atmosphere induction heating heat treatment. This process is generally carried out 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. Induction heating treatment has a good strengthening effect, and the induction heating speed is fast, which helps to refine grains and reduce surface decarburization, and can give full play to and improve the strength and toughness of materials.

3: Surface nitriding heat treatment technology. In recent years, high-stress valve springs or other high-stress clutch springs have also adopted surface nitriding technology in order to achieve reliable fatigue life. Now the more advanced technology is low-temperature gas nitriding technology, and the general nitriding temperature is (450 ~ 470) ℃, the gas nitriding time is (5 ~ 20) h.