Seamless steel tube factory cold drawing (rolling) : round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating)→ multi-pass cold drawing (cold rolling)→ blank tube → heat treatment → straightening → water pressure test (flaw detection)→ marking → storage

Seamless steel tube factory hot rolling (extrusion seamless steel tube) : round tube billet → heating → perforation → three roll cross rolling, continuous rolling or extrusion → tube stripping → sizing (or reducing)→ cooling → straightening → water pressure test (or defect detection)→ marking → storage is made of steel ingot or solid tube billet by perforation, and then made by hot rolling, cold rolling or cold drawing. Large diameter thick wall steel pipe factory specifications are expressed as outer diameter * wall thickness mm. Seamless steel tubes are divided into hot rolled and cold rolled (dial) seamless steel tubes. Hot rolled seamless steel tubes are classified into general steel tubes, low and medium pressure boiler tubes, high pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological tubes and other steel tubes. Seamless steel pipe factory cold rolled (dial) seamless steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipe, also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe in Tongren large-caliber thick-walled steel pipe factory is generally greater than 32mm and the wall thickness is 2.5-75mm. The diameter of cold-rolled seamless pipe can reach 6mm and the wall thickness can reach 0.25mm. The outer diameter of thin-walled pipe can reach 5mm and the wall thickness is less than 0.25mm.

Hot rolling, as the name implies, rolling parts of high temperature, so the deformation resistance is small, can achieve large deformation. Taking steel plate rolling as an example, the thickness of continuous casting billet is about 230mm, and after rough rolling and finishing rolling, the final thickness is 1~20mm. At the same time, because the thickness ratio of the steel plate is small, the dimensional accuracy is relatively low, it is not easy to appear the shape problem, mainly to control the crown. For the requirements of the organization, generally through the control of rolling and cooling to achieve, that is, the control of finishing rolling rolling temperature, rolling temperature.