The main differences between Cold Drawn Steel Tubes and hot rolled are
Aug 10, 2021
1. The cold-rolled formed steel allows local buckling of the section, so that the bearing capacity of the bar after buckling can be fully utilized; while the hot-rolled steel does not allow local buckling of the section. To
2. Hot-rolled steel and cold-rolled steel have different causes of residual stress, so the distribution on the cross-section is also very different. The residual stress distribution on the section of cold-formed thin-walled steel is curved, while the residual stress distribution on the section of hot-rolled or welded steel is thin-film.
There is not much difference between the two steel pipes in the finished product, and they are generally manufactured according to the standard. There is no difference in mechanical properties.
Most of the existing ones are different processing techniques and different final precisions. Generally speaking, the cold-drawn dimensional accuracy and surface finish are higher.
Hot rolling process: tube billet---heating---piercing---rolling tube---sizing---cooling bed---straightening---cutting tube---inspection---packing--- Ship
Cold drawing process: tube billet --- heating --- piercing - hot rolling (second wear), etc. --- heading - pickling - phosphating - cold drawing - annealing (multiple passes can be repeated From the beginning to the post process) ---Straightening ---Cutting ---Inspection ---Packing---Delivery
