1、冷轧成型钢允许截面出现局部屈曲，从而可以充分利用杆件屈曲后的承载力；而热轧型钢不允许截面发生局部屈曲。

1. Cold rolled formed steel allows for local buckling of the cross-section, thereby fully utilizing the load-bearing capacity of the member after buckling; However, hot-rolled steel sections are not allowed to experience local buckling.

2、热轧型钢和冷轧型钢残余应力产生的原因不同，所以截面上的分布也有很大差异。冷弯薄壁型钢截面上的残余应力分布是弯曲型的，而热扎型钢或焊接型钢截面上残余应力分布是薄膜型。

2. The causes of residual stress in hot-rolled and cold-rolled steel sections are different, so there are also significant differences in the distribution of residual stress on the cross-section. The residual stress distribution on the cross-section of cold-formed thin-walled steel is curved, while the residual stress distribution on the cross-section of hot-rolled or welded steel is thin film.

3、热轧型钢的自由扭转刚度比冷轧型钢高，所以热轧型钢的抗扭性能要优于冷轧型钢。

3. The free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsional resistance of hot-rolled steel is better than that of cold-rolled steel.

Q235B方管分类：

Q235B square tube classification:

冷轧退火管、冷轧机窜管、冷轧管和热轧管、冷轧管轧辊、冷轧厚壁管、冷轧圆管、冷轧钢管、Q235B方管钢、冷轧管机、冷轧管设备。

Cold rolled annealed tubes, cold rolled mill tubes, cold rolled and hot-rolled tubes, cold rolled tube rolls, cold rolled thick walled tubes, cold rolled round tubes, cold rolled steel pipes, Q235B square tubes, cold rolled tube mills, and cold rolled tube equipment.

Q235B方管热轧和冷轧的主要区别是： 1、冷轧成型钢允许截面出现局部屈曲，从而可以充分利用杆件屈曲后的承载力；而热轧型钢不允许截面发生局部屈曲。 2、热轧型钢和冷轧型钢残余应力产生的原因不同，所以截面上的分布也有很大差异。冷弯薄壁型钢截面上的残余应力分布是弯曲型的，而热扎型钢或焊接型钢截面上残余应力分布是薄膜型。 3、热轧型钢的自由扭转刚度比冷轧型钢高，所以热轧型钢的抗扭性能要优于冷轧型钢。 Q235B方管分类： 冷轧退火管、冷轧机窜管、冷轧管和热轧管、冷轧管

The main difference between Q235B square tube hot rolling and cold rolling is that: 1. Cold rolled formed steel allows for local buckling of the cross-section, which can fully utilize the load-bearing capacity of the member after buckling; However, hot-rolled steel sections are not allowed to experience local buckling. 2. The causes of residual stress in hot-rolled and cold-rolled steel sections are different, so there are also significant differences in the distribution of residual stress on the cross-section. The residual stress distribution on the cross-section of cold-formed thin-walled steel is curved, while the residual stress distribution on the cross-section of hot-rolled or welded steel is thin film. 3. The free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsional resistance of hot-rolled steel is better than that of cold-rolled steel. Q235B square tube classification: cold-rolled annealed tube, cold-rolled mill tube, cold-rolled tube and hot-rolled tube, cold-rolled tube