What is cold drawn steel？

Cold-drawn steel uses hot-rolled steel as raw material, and the product quality is better than that of hot-rolled steel. For example, the cold-drawn profile causes metal work hardening due to cold deformation, which increases the tensile strength and yield strength of the cold-drawn material, and can improve the comprehensive mechanical properties after heat treatment. The shape and size of cold-drawn steel are similar to those of mechanical parts, and the dimensional accuracy is high, which reduces the secondary machining allowance. In the machining industry, cold-drawn materials are used instead of hot-rolled materials, and metal consumption can be reduced by 10% to 30%. In addition, the cold-drawn profiles have high straightness and surface roughness below 0.63 to 5 μm, and some of them can be used directly without machining. The cold-drawn steel production equipment is simple, the investment is small, the factory is fast, and the process operation is easy. However, the production needs to cooperate with many and reciprocating processes such as heat treatment and pickling, and the production cycle is long. At present, cold-drawn steel has become an important raw material for modern light industry, construction, machinery, electrical machinery, automobile and shipbuilding, textile industry, broadcasting and communication, and national defense industry. Cold-drawn materials in industrially developed countries have accounted for more than 5% of the total output of steel.

Cold-drawn steel is divided into cold-drawn carbon steel and cold-drawn alloy steel according to its chemical composition.

According to the variety and use, there are: cold-drawn pipes, the outer diameter is from 0.2 to 765mm, and the minimum wall thickness can reach 0.015mm, including high-strength pipes, thin-walled pipes, capillaries and various special-shaped pipes; cold-drawn rods, with a diameter of 3 ~100mm, including round, square, trapezoidal and hexagonal sections, used as balls, rollers, nuts, various pins; cold drawn wire, diameter 0.001 (very fine wire) ~ 16mm (thick wire), including spring Steel wire, tire steel wire, card clothing steel wire, welding rod, prestressed steel wire, stainless steel wire, piano steel wire, rope making wire, etc.