spring steel wire have been put forward with the development of spring's application technology. The main requirements are mainly about the fatigue life, anti- relaxation properties, corrosion resistance, non-magnetic, electrical conductivity, wear resistance, heat resistance and so on.
After the 100 years development of spring steel wire, the technology experienced from lead quenching to oil quenching, now have developed to induction hardening. Add with the innovation and improvement of equipment, the quality of spring steel wire is constantly updated. The test proved that the spring steel wires through induction hardening and drawing temper which developed in recent years, has a higher improvement about the plasticity, toughness, fracture toughness, fatigue life and so on. Because the induction heating time is short and quenching organization is small, the surface of spring steel wire almost has no decarburized layer.
Ultra-fined grain thermomechanical treatment spring steel wire is another effective research which has been able to indeed application. Ultra-fined grain thermomechanical treatment is a composite toughness craft which can not only improve the mechanical property, but also can improve the surface quality of spring steel wire. The surface quality of material has an important influence to the fatigue performance. In order to keep the surface quality, we can apply stripping process to the material with special requirements and remove the surface about 0.1mm. To the uneven surface appeared during the wire drawing, we can use the electrolytic grinding and reduce the surface roughness.