Thick walled square tube is a kind of square tube mainly used in manufacturing and daily life. It belongs to a kind of main plate which is relatively solid and solid. The thick wall square pipe will also encounter bending deformation in use. How to avoid bending of Jinan square pipe, the following measures should be taken to prevent it:
(1) The layer by layer cold drawing process of external spraying followed by internal spraying is selected. Because the inner watering of the thick wall square tube flows from one end of the thick wall square tube to the other end, the cold drawing rate of the thick wall square tube on both sides is different, resulting in the bending of the thick wall square tube. The external watering and cold drawing can be carried out first to promote the change of the surface of the thick wall square pipe, and then the internal watering can be used to carry out the cooling to prevent the bending and deformation of the thick wall square pipe. The delay time of the internal watering can be extended by 2~10s compared with the external sprinkler.
(2) Reduce the length of the overhanging end of the thick wall square tube on the rotating wheel. According to effective rotation, reasonable layout and length control of thick wall square tube, the overhang of the top of thick wall square tube is controlled at ≤ 600mm, which can reasonably reduce the centripetal force during heat treatment and reduce the bending of thick wall square tube.
(3) Adjust the steering wheel speed ratio.
(4) Manipulate the turning wheel core. The core error of the rotating wheel has a great influence on the bending of thick walled square tubes during heat treatment. Through scientific research, the core deviation of the rotating wheel should be adjusted within 0~5mm.
(5) Control the internal and external spraying water volume and uniformity. Oil and gas well pipe heat treatment refrigeration adopts the method of external layer refrigeration and internal diameter spraying. The external spraying water volume should be uniform. The reasonable alignment of internal spraying water volume and internal nozzle is also the key factor affecting the bending degree of thick walled square pipe during water quenching.
In case of bending and deformation of the thick walled square tube, if it can be corrected, the thick walled square tube can be used again, otherwise, the use of the thick walled square tube will be greatly affected. More relevant precautions come to our website http://www.jnhxtcg.com Consult.