In the production process, the pickling process is to remove the surface oxide scale, and then go through lubrication treatment (carbon steel-phosphorous saponification, stainless steel-butter lime, copper aluminum pipe-oiling), using the old process-copper plating), and then For drawing and deep processing.

The selection principle of the non-destructive testing method for the surface of the straight seam steel pipe: the ferromagnetic steel pipe is selected for magnetic particle testing, and the non-ferromagnetic steel pipe is used for the penetration test.

Straight seam steel pipes are parallel steel pipes between the steel pipe and the weld seam. They are usually divided into transformer cooling oil pipes and metric electric welded steel pipes.

The double-sided submerged arc welded spiral steel pipe should be subjected to mechanical performance test, flattening test and flaring test before leaving the factory, and must meet the standard requirements.

In the process of steel pipe welding, there are many precautions. If you neglect it, you may make a big mistake. The welding construction does not pay attention to selecting the appropriate voltage, whether it is for bottoming, filling, or covering, regardless of the size of the groove, choose the same In this way, the required penetration depth and penetration width may not be reached, and defects such as undercut, porosity, and spatter may occur.

Coating anti-corrosion is to apply paint evenly and densely on the surface of the rust-removed metal pipe to isolate it from various corrosive media. It is one of the most basic methods for steel pipe anti-corrosion.