1、冷軋成型鋼允許截面出現局部屈曲，從而可以充分利用桿件屈曲后的承載力；而熱軋型鋼不允許截面發生局部屈曲。

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、熱軋型鋼和冷軋型鋼殘余應力產生的原因不同，所以截面上的分布也有很大差異。冷彎薄壁型鋼截面上的殘余應力分布是彎曲型的，而熱扎型鋼或焊接型鋼截面上殘余應力分布是薄膜型。

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、熱軋型鋼的自由扭轉剛度比冷軋型鋼高，所以熱軋型鋼的抗扭性能要優于冷軋型鋼。

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方管分類：

Q235B square tube classification:

冷軋退火管、冷軋機竄管、冷軋管和熱軋管、冷軋管軋輥、冷軋厚壁管、冷軋圓管、冷軋鋼管、Q235B方管鋼、冷軋管機、冷軋管設備。

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方管熱軋和冷軋的主要區別是： 1、冷軋成型鋼允許截面出現局部屈曲，從而可以充分利用桿件屈曲后的承載力；而熱軋型鋼不允許截面發生局部屈曲。 2、熱軋型鋼和冷軋型鋼殘余應力產生的原因不同，所以截面上的分布也有很大差異。冷彎薄壁型鋼截面上的殘余應力分布是彎曲型的，而熱扎型鋼或焊接型鋼截面上殘余應力分布是薄膜型。 3、熱軋型鋼的自由扭轉剛度比冷軋型鋼高，所以熱軋型鋼的抗扭性能要優于冷軋型鋼。 Q235B方管分類： 冷軋退火管、冷軋機竄管、冷軋管和熱軋管、冷軋管

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