About

https://www.tjdecho.com/ -roll rolling tube billet should initially, after the extrusion sizing test, if there is no action after split on the surface of pipe need to be reduced after cutting machine, reducing grow regarding a meter of billet.And then get in the annealing procedure, annealing with acid pickling liquid, pickling when should pay attention to whether there is a great deal of bubble surface area, if there is a great deal of bubbles show that the quality of the steel tube can not satisfy the equivalent standards.Appearance on chilly rolled seamless steel tube is much shorter in warm rolled smooth steel pipeline, cool rolled smooth steel tube wall thickness usually smaller sized than hot rolled seamless steel tube, however the surface looks brighter than the thick ASTM A106 smooth steel pipeline, not a lot of rough surface area, the size is not a