2022

Carbon spring wire type

Author

2022-03-31 10:08

The current recommended standards for carbon spring steel wire are divided into two types:
1. It is cold-deformed reinforced steel wire, also known as cold-drawn spring steel wire. The cold-drawn carbon spring steel wire is first quenched with lead to obtain the sorbite structure, then the surface is phosphated, and then drawn to the size of the finished product with a large reduction rate. The steel wire structure is fibrous, with high tensile strength and elastic JX, and good bending and torsion properties. The cold-drawn spring steel wire has high dimensional accuracy, smooth surface, no oxidation and decarburization defects, and stable fatigue life. It is a widely used spring steel wire.
2. It is martensite strengthened steel wire, also known as oil quenched and tempered steel wire. The carbon steel wire can obtain good comprehensive mechanical properties after quenching and tempering. When the steel wire size is small（ φ≤ 2.0mm), the strength index of oil quenched and tempered steel wire is lower than that of cold-drawn steel wire after sorbite treatment. When the steel wire specification is large（ φ≥ 6.0 mm) sorbitic steel wire can not obtain the required strength index by large reduction ratio, while oil quenched and tempered steel wire can obtain higher performance than cold-drawn steel wire as long as it is fully quenched. Under the same tensile strength, martensitic strengthening steel wire has higher elastic JX than cold deformation strengthening steel wire. The metallographic structure of cold-drawn steel wire is fibrous and anisotropic. The metallographic structure of oil-quenched and tempered steel wire is homogeneous tempered martensite, which is almost isotropic. At the same time, the anti-relaxation property of oil-quenched and tempered steel wire is better than that of cold-drawn steel wire, and the service temperature (150~190 ℃) is also higher than that of cold-drawn steel wire (≤ 120 ℃). In recent years, medium and large size oil quenched and tempered steel wire has a tendency to replace cold drawn steel wire.