Oil quenching and tempering steel wire first produces the steel wire to the product standard, then carries on the oil quenching tempering treatment, by tempering martensite organization delivery. The organization uniformity is an important policy choice of oil tempered steel wire function, because the hardenability of carbon spring steel wire Co., the standard too much oil steel after quenching and tempering core can not be completely transformed into martensite, so the standard rules of oil tempered carbon spring steel wire supply diameter less than 12.0mm.
With the cold drawn carbon spring steel wire, ultimate oil tempered steel wire tensile strength and elasticity of less than 2.0mm in diameter is lower than that of cold drawn steel wire. But the standard of steel wire (diameter > 6.0mm) sorbite after disposal, the reduction rate of drawing high tensile strength may not be obtained, and the oil tempered steel wire only completely hardenability, can obtain higher tensile strength than cold drawn steel wire. Even under the same tensile strength, the elastic limit of the quenched and tempered steel wire is also higher than that of the cold drawn steel wire.
The anisotropy of the cold drawn spring steel wire is obvious, while the oil tempered steel wire is almost the same. The fatigue life and stress relaxation function of oil quenched tempered steel wire are much better than those of cold drawn steel wire. The working temperature is higher (150~170 C), and the creep resistance function is very good. In addition, the oil quenched and tempered steel wire has good straight degree, the steel wire is straight and almost bent after coiling, and the forming function is very good when coiling the spring. Therefore, the large standard oil quenching and tempering carbon spring steel wire in industrial developed countries almost replaces the cold drawn carbon spring steel wire.
