Q:Differences between Cold-rolled round bar and Ordinary Round bar？

1. Cold-drawn round steel (also called cold-drawn round steel, plain round steel) is a high-precision round steel. The material undergoes a "quenching and tempering" process and can be directly used to make shafts without further processing. Ordinary round steel is the common round steel used in construction. It is supplied in a "normalized" heat treatment state, and both its dimensional accuracy and material are of a standard level.

2. Cold-drawn steel allows for local buckling of the cross-section, thus fully utilizing the load-bearing capacity after buckling; hot-rolled steel does not allow for local buckling of the cross-section.

3. The causes of residual stress in hot-rolled and cold-rolled steel are different, resulting in significant differences in their cross-sectional distribution. The residual stress distribution in the cross-section of cold-formed thin-walled steel is bending-type, while the residual stress distribution in the cross-section of hot-rolled or welded steel is membrane-type.

4. Hot-rolled steel has a higher free torsional stiffness than cold-rolled steel, so hot-rolled steel has better torsional resistance than cold-rolled steel.

Time：22/05/2026 17:19:39