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The Production Process Of Seamless Steel Pipe
- Nov 04, 2017 -

General seamless steel tube production process can be divided into cold drawn and hot-rolled two kinds, cold-rolled seamless steel pipe production process is generally more complex than hot rolling, the first three rolls of tube billet, after extrusion to carry out a sizing test, if the surface does not respond to the crack after the tube cutting machine to cut, cut into a length of about one meter of the billet. Then enter the annealing process, annealing to use acidic liquid for pickling, pickling should pay attention to the surface whether there is a large number of blistering, if there is a large number of bubbles to show that the quality of the steel pipe does not reach the standard of response.  

The appearance of cold-rolled seamless steel pipe to be shorter than hot-rolled seamless steel tube, cold rolled seamless steel tube thickness is generally smaller than hot-rolled seamless steel tube, but the surface looks more bright than the thick wall seamless steel tube, the surface is not too rough, the caliber also does not have too many burr. Hot-rolled seamless steel tube delivery status is generally hot-rolled after heat treatment delivery. Hot-rolled seamless steel pipe after the quality of the staff after the strict manual selection, after the quality of the surface coating oil, followed by a number of cold drawing experiments, hot-rolled after treatment to carry out a perforation of the experiment, if the perforation expansion is too large will be straightening rectification. After straightening, the transmission device is transmitted to the flaw detection machine to carry out the flaw detection experiment, finally pastes the label, carries on the specification arrangement after placing to the warehouse.