How To Produce Thick Wall Seamless Steel Pipe

 

Generally speaking, the production process of thick-walled seamless pipe can be divided into two types: cold drawn/rolled and hot rolled. The production process of cold rolled seamless steel pipes is generally more complicated than hot rolled. First, the billet will be subjected to three-rolled continuous rolling, and then the sizing test will be carried out after extrusion. If the surface does not respond to cracks, the round pipes will be cut into one meter long. The next step is annealing process. Annealing needs to be pickled with acidic liquid. When pickling, pay more attention to whether there are a lot of bubbles on the surface. If there are a lot of bubbles, it means the quality of the steel pipe does not meet the standard. In appearance, cold rolled seamless steel pipes are shorter than hot rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes and without too many burrs on the end. The hot-rolled seamless steel pipes are generally delivered after heat treatment in the hot-rolled state. After the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the staff. Then the surface shall be oiled, and then followed by multiple cold drawing experiments, and the piercing experiment shall be carried out after the hot-rolling treatment. If the perforation is too large, it must be straightened. After straightening, Eddy current test will be done. Finally, all the pipes will be stored in the warehouse.

O.D.: 6MM-1100MM

W.T.: 1MM-100MM

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