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

There is stress in the steel pipe, no matter where it is, it will cause the steel pipe to crack during quenching. Generally, in the production process, after the heat treatment, a cooling process is required. If the cooling is too fast or incomplete, it will also cause cracks on the surface of the steel pipe.

During the welding of large-diameter thick-walled pipes, the workpiece and the solder melt to form a molten area, and the molten pool is cooled and solidified to form a connection between the materials.