The technological principle of cold-drawn steel
2025-07-31
Cold drawing is a process that uses specially designed tungsten alloy dies to apply strong tensile force to steel (such as HPB300 grade rebar with a diameter of 6-10mm) at room temperature, gradually drawing it through die holes of decreasing diameter. During this process, the steel's cross-section is compressed, and it is stretched longitudinally. The internal crystal lattice undergoes slip and distortion, increasing the density of lattice dislocations. This significantly improves tensile strength (by 40%-90%), while reducing ductility and increasing hardness, ultimately forming cold-drawn steel with hard steel properties (such as cold-drawn low-carbon steel wire).
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