The thermal expansion of seamless steel tubes is what we often call thermal expansion tubes. The density of seamless steel tubes is relatively low, but the shrinkage of the tubes is very strong. The seamless steel tubes can be called thermal expansion tubes. A method of enlarging pipe diameter by cross rolling or drawing is introduced, which can produce non-standard and special type seamless pipe in a short time with low cost and high production efficiency. It is an international trend in the field of pipe rolling.


Seamless steel tube is also called automatic steel tube mill in the production of rolling mill. Cut the rod into the required length, align the perforated end of the tube, then heat it in the heating furnace, and perforate it in the punching machine. While the perforation continues to rotate and move, under the action of rolling and head, capillaries gradually form in the lumen. Then it is sent to the automatic rolling mill to continue rolling. Finally, the whole wall thickness of the whole machine, through the sizing machine diameter, to achieve specifications.


Seamless tube thermal expansion is seamless tube, because you buy 530mm tube, no such model, the largest seems to be 460MM, manufacturers only need to reheat once (re-processing), generally should be the quality of the tube damage, of course, see what you do. Of course, it's more expensive because both go through the process.