First of all, cold-drawn special-shaped seamless steel pipes and cold-rolled formed steel allow local buckling of the section, so that the bearing capacity of the rod after buckling can be fully utilized; while hot-rolled section steel does not allow local buckling of the section.
Secondly, the causes of residual stress in hot-rolled steel and cold-rolled steel are different, so the distribution on the cross-section is also very different.
Then, the residual stress distribution on the cold-formed thin-walled steel section is curved type, while the residual stress distribution on the hot-rolled steel or welded steel section is film type.
After comparison, the free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsional performance of hot-rolled steel is better than that of cold-rolled steel. Cold drawn special-shaped seamless steel pipe general material: 10# 20# 45# Q345B (16mn) 20crmo
In addition, the cold-drawn special-shaped seamless steel pipe has high dimensional accuracy, smooth surface without dents, good smoothness, and high internal surface cleanliness. It has a smoother surface than ordinary drawn steel pipes, saves costs, and has excellent mechanical properties. It is a good choice for the machinery industry. Suitable for machining of automotive parts.
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