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.

Seamless steel pipes have two types of wall thickness accuracy problems: horizontal wall thickness accuracy and longitudinal wall thickness accuracy.

The extra height of the outer weld seam is not conducive to anti-corrosion. If the epoxy glass cloth is used for anti-corrosion during operation, the extra height of the outer weld seam will make the weld toe difficult to be pressed firmly.