The openings of seamless steel pipes must not only meet quality requirements, but also meet relevant specifications and standards.

The acceptance of seamless steel pipes should follow corresponding specifications and standards, mainly including appearance inspection, physical performance testing and chemical composition testing.

Bright steel pipe is a refined steel pipe that is cold drawn or cold rolled. Bright seamless pipes must undergo non-oxidation bright heat treatment (NBK state), non-destructive testing, the inner wall of the steel pipe is brushed with special equipment and high-pressure flushing, anti-rust oil is applied to the steel pipe for anti-rust treatment, and both ends are capped for dust-proof treatment.

Large-diameter spiral steel pipe is a general term, generally referring to spiral steel pipes (SSAW steel pipe) with a diameter greater than 1 meter. Spiral steel pipe is a welded steel pipe made of steel strips that are bent and then welded. Steel pipes need to undergo hydraulic pressure, bending, flattening and other experiments, and have certain requirements for surface quality. The delivery length is usually 12 meters, and delivery to fixed length is often required.

The submerged arc welding method is one of the main production methods of welded steel pipes. Steel pipes welded by the submerged arc welding process include straight seam submerged arc welded steel pipes (LSAW steel pipes) and spiral submerged arc welded steel pipes (SSAW steel pipes).

Galvanized steel pipe has the dual advantages of corrosion resistance and long service life, and the price is corresponding to that of carbon steel seamless pipe or welded pipe, which is relatively cheap and has an increasing usage rate. However, some users do not pay attention when welding galvanized pipes, resulting in steel pipe defects. So what issues should we pay attention to when welding galvanized pipes?