Spring barrel steel wire production process

Another type of carbon spring steel wire is martensite reinforced steel wire, also known as oil quenched tempered steel wire. When the size of steel wire is small (φ ≤2.0 mm) , the strength indexes of oil-quenched and tempered steel wire are lower than that of cold-drawn steel wire after Soxhlet treatment. When the size of steel wire is large (φ ≥6.0 mm) , it is impossible to obtain the required strength index by adopting a large area reduction ratio, the oil-quenched and tempered steel wire can obtain higher performance than cold-drawn steel wire only if it is fully quenched. Under the same tensile strength, martensite reinforced steel wire has higher elastic limit than cold deformation reinforced steel wire. The microstructure of cold-drawn steel wire is fibrous and anisotropic. The microstructure of oil-quenched and tempered steel wire is homogeneous martensite and 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°C) is also higher than that of cold-drawn steel wire (≤120°C) . Large-size oil-quenched and tempered steel wire has a tendency to replace cold-drawn steel wire.