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2025
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What is the difference between cold drawn wire and cold drawn wire?
1、 Differences in Processing Principles and Techniques
1. Cold drawing: Metal billets (such as low carbon steel and stainless steel) are stretched unidirectionally by a stretching machine at room temperature to reduce the cross-section and form. The process is simple and the cost is low, but the deformation is limited (usually the cross-sectional reduction rate is ≤ 30%). For example, the tensile strength of Q235 cold drawn wire can reach 400-500MPa (refer to GB/T 342-2017).
2. Cold drawn wire: Combining stretching and die extrusion, the metal is subjected to radial pressure when passing through a conical die hole, resulting in denser grains. The deformation is greater (with a cross-sectional reduction rate of over 50%), for example, the cold drawn wire strength of 45 # steel can be increased to 600-800MPa (according to YB/T 5220-2019). The key difference is that cold drawn wire requires multiple annealing to eliminate internal stress.
2、 Comparison of Performance and Surface Characteristics
1. Mechanical properties:
-Cold drawn wire has more significant work hardening, with a hardness 10% -15% higher than cold drawn wire, but a lower elongation rate (about 8% for cold drawn wire and about 12% for cold drawn wire).
-Fatigue life testing shows that cold drawn wire performs better under cyclic loading (data source: Journal of Metal Materials Engineering, 2021).
2. Surface quality:
-The surface of cold drawn wire is prone to residual oxide skin, with a roughness Ra value of about 3.2 μ m; The cold drawn wire is polished by the mold, and the Ra value can be controlled within 1.6 μ m, suitable for precision parts.
3、 Typical application scenarios
1. Cold drawn wire: widely used in construction binding, ordinary welding wire (such as ER70S-6), daily necessities (hangers, fences), and cost sensitive fields.
2. Cold drawn wire: High demand scenarios such as automotive springs (65Mn cold drawn wire), bearing rollers (GCr15), and hydraulic cylinder precision piston rods (tolerance can be controlled within ± 0.02mm).
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