When the friction force increases, the positive pressure on the strip increases, and the deformation of the strip increases, which causes the roller to strain the strip and produce surface scratches.

Defects produced in the actual production of high-frequency welded pipes are sometimes not caused by one cause, but are usually the result of a combination of multiple factors.

Seamless steel pipe quality inspection is divided into the following aspects: chemical composition analysis; steel pipe geometric size and shape inspection; seamless pipe steel surface quality inspection; seamless pipe steel management performance inspection; seamless pipe steel pipe process performance inspection; none Metallographic analysis of seam pipe and steel pipe.

If the welded pipe is not straight, check first to see if the problem lies in the sizing, because it is a very important point to affect the straightness of the welded pipe.

The seamless steel pipe cone-roll piercing machine is an ancient piercing process. In the early 1980s, the cone-roll piercing machine with horizontal rolls was revived.

Pitting corrosion and pits are common surface quality problems in seamless pipe manufacturing. When delivering pits and potholes, if this happens, many seamless steel pipe mills will say that the quality problems of the original steel mills have caused this problem. The choice of round steel may have an impact on seamless pipe manufacturing, but it is not the final deciding factor. The real reason lies in this process-perforation.