In the processing of cold-drawn precision steel pipes, there are cold hard bottoming and hydrogen embrittlement conditions, which are the key reasons for the cracking of cold-drawn seamless steel pipes.

Generally, the technical requirements for seamless steel pipes for national standard fluids mainly include chemical composition, geometric dimensional accuracy, surface quality, physical and chemical properties, etc.

If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and the nuclear energy of the phosphating solution cannot remove them, and the quality of phosphating will be reduced.

Outstanding pressure resistance, easier to transfer than ordinary steel pipes, economical and applicable, making it easier to build seamless steel pipe supports.

The physical properties of seamless steel pipes are very stable, so they can be widely used.

Introduce the identification methods of 6 kinds of hot-rolled large-diameter seamless steel pipes