Carbon spring wire type

[guide] the current national and industrial recommended standards for carbon spring steel wire are divided into two types: one is cold deformation reinforced steel wire, also known as cold drawn spring steel wire.

The current national and industrial recommended standards for carbon spring steel wire are divided into two types:

One is the cold deformation 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 phosphated on the surface, and drawn to the finished product size with a large reduction rate. The steel wire structure is fibrous, with high tensile strength and elastic limit, and good bending and torsion properties. Cold drawn spring steel wire is the most widely used spring steel wire with high dimensional accuracy, smooth surface, no oxidation and decarburization defects, stable fatigue life.

The other is martensitic strengthening steel wire, also known as oil quenching and tempering steel wire. When the specification of carbon steel wire is small (φ ≤ 2.0mm), the strength index of oil tempered steel wire is lower than that of sorbitic cold drawn steel wire. When the size of steel wire is large (φ ≥ 6.0mm), it is impossible to obtain the required strength index by using a large reduction of area ratio for the sorbitic steel wire, while the oil quenched and tempered steel wire can obtain higher performance than the cold drawn steel wire as long as it is fully quenched. Under the same tensile strength, martensitic steel wire has higher elastic limit than cold deformation steel wire. The microstructure of cold drawn steel wire is fibrous and anisotropic. The microstructure of oil tempered steel wire is homogeneous tempered martensite, almost isotropic. At the same time, the relaxation resistance 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, the medium and large size oil quenched and tempered steel wire has a tendency to replace cold drawn steel wire.