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  • Mart 25, 2021
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Cold drawn is to pull the steel bar to any point K in the strengthening stage of its σ-ε curve, and then slowly unload the load. When it is loaded again, its yield limit will be increased, and its plastic deformation capacity will be somewhat reduced. Cold drew generally can control the cold drawing rate. After the steel bar is cold drawn, the general yield point can be increased by 20% to 50%.
The cold pull is to forcibly pull the light round steel bar through the hole of the hard alloy wire drawing die. The cold pull effect is stronger than that of pure tension. The steel bar is not only pulled but also squeezed at the same time. After one or more cold pulls, the yield point of cold pull low carbon steel wire can be increased by 40% to 60%, but it loses the plasticity and toughness of soft steel and has the characteristics of hard steel.
Cold rolling is the rolling of round steel on a cold rolling mill into steel bars with regular cross-sections, which can improve its strength and adhesion to concrete. When the steel bar is cold rolled, the longitudinal and transverse deformations occur simultaneously, so it can better maintain its plasticity and internal structural uniformity.
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