Production Process

- Sep 06, 2017 -

General seamless steel pipe production process can be divided into cold drawing and hot rolling two, cold-rolled seamless steel pipe production process is generally more complicated than the hot-rolled, the first tube to be three-roll rolling, after extrusion to be carried out Sizing test, if the surface is not responding to the crack after the tube to go through the cutting machine for cutting, cutting into a length of about one meter of blank. And then enter the annealing process, annealing to use acid liquid for pickling, pickling should pay attention to whether the surface of a large number of foaming produce, if there is a large number of blistering that the quality of steel pipe can not meet the corresponding standards. The appearance of cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe, cold-rolled seamless steel pipe wall thickness is generally smaller than the hot-rolled seamless steel pipe, but the surface looks thicker than thick-walled seamless steel pipe, the surface is not too More rough, caliber no too much burr.

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