The outer diameter accuracy of the hot -rolled torque tube is made by artificial decision. The result depends on the customer. It depends on the customer's requirements for seamless pipe outer diameter, the operation and accuracy of the steel pipe diameter equipment, and the steel pipe fixed diameter process system.
The method of hot -rolled torque tube is an important factor in determining the external tolerance of the steel pipe. The hot -rolled torque tube of the longitudinal diameter can, the outer diameter accuracy of the steel pipe can be about 1%, while the seamless pipe high diameter accuracy of the seamless pipe of the oblique rolling diameter reaches 0.5%.
The impact of the process system on the outer diameter of the steel pipe is mainly determined by the stability of the rolling temperature and temperature of the steel pipe diameter. The rolling temperature of the steel pipe is high. After rolling, the hot -rolled torque tube has a large amount of tube. It is often easy to exceed the outer diameter to generate a negative deviation of the steel pipe. On the contrary, the low rolling temperature may exceed the positive deviation and become a secondary product. Therefore, according to the size specifications, steel pipes, and temperature conditions and tool wear of the hot -rolled tone tube, the steel tube rolling machine should be continuously adjusted.
In the actual production process, some problems existing in the general hot -rolled square tube: the deviations generated during the perforation machine, the equipment manufacturing accuracy and structure, the installation and adjustment of the equipment line, the heating process of the pipeline, the pipe's pipe's feeding process , Influence of tool accuracy, using an automatic rolling machine.
