WHICH IS BETTER HOT ROLLED OR COLD DRAWN TUBES?
As we all know, cold drawn steel tube is usually more expensive than the hot rolled tube, The outer diameter and wall thickness of the hot-rolled seamless steel tube is changing. The outer diameter is larger on one end and smaller on the other hand. The outer diameter and wall thickness alongside the whole steel tube is changing. This is much determined by the hot rolling production process. The process starts from round steel after the big furnace, burning to over 1080 in the round steel punch, the whole round steel is turned into a hollow tube billet. As the whole process takes some time, due to the high temperature, the OD of the pipe’s front end is larger, and wall thickness is thin. When temperature gets lower, wall thickness alongside the pipe becomes slightly thicker. And residual heat will help to calibrate the hot rolling of the tube billet, and the tube billet is rolled into the specified outer diameter. In all, the tolerance of hot-rolled seamless steel tube is rela...