In high-frequency longitudinally welded pipes, the manifestations of cracks include long cracks, partial periodic cracks, and irregular intermittent cracks.

There are many things that seamless steel pipes need to be tested, especially after they leave the factory, they need to be continuously tested for all links and models of seamless steel pipes.

Steel pipes are generally divided into seamless steel pipes and welded steel pipes according to production methods. This time we mainly introduce welded steel pipes, that is, seam steel pipes.

During the production and transportation of seamless steel pipes, oil stains will inevitably adhere to the surface of the seamless pipe, which will affect the quality of the seamless pipe rust removal and phosphating, and reduce the adhesion between the coating and the substrate.

According to different production methods (or processes), seamless steel pipes can use steel ingots, continuous casting billets, rolling billets, forging or centrifugal casting hollows, etc.

Seamless pipes are generally non-magnetic or very weak, but the presence of magnetism will also affect our failure in use, so for many seamless steel pipe factories, it is still necessary to eliminate the magnetic properties of seamless pipes.