Under normal circumstances, the seamless steel pipes used daily are of normal caliber, and small-caliber seamless steel pipes are used in some special places.

Seamless steel pipe is a kind of conveying pipe with a very high degree of stability, and has the characteristics of relatively high reliability and relatively long service life.

The main difference between straight seam steel pipe and seamless steel pipe is production technology and application.

Straight seam steel pipes are steel pipes whose welds are parallel to the longitudinal direction of the steel pipe.

From the perspective of seamless steel pipe rolling technology, the following two points have formed restrictions on the further development of FFM rolling technology

Weld seam cracks mostly appear in the weld seam, showing a small hair shape, most of which occur in the superficial part of the weld seam, some can be seen with the naked eye, and some need to be carefully identified or even enlarged to find.