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<br> http://www.tjdecho.com/ -roll rolling tube billet have to first, after the extrusion sizing examination, if there is no action after split on the surface of pipe need to be cut after reducing device, cutting expand about a meter of billet.And then get in the annealing process, annealing with acid pickling fluid, pickling when must take note of whether there is a lot of bubble surface area, if there is a lot of bubbles show that the quality of the steel tube can not satisfy the matching standards.Appearance on cool rolled seamless steel tube is shorter in hot rolled seamless steel pipe, cold rolled seamless steel tube wall surface thickness generally smaller sized than hot rolled seamless steel tube, yet the surface area looks brighter than the thick ASTM A106 seamless steel pipe, not a lot of harsh surface area, the diameter is not a great deal of<br><br> <br><br><br><br> <br><br><br> <br><br><br><br>