It is one of the basic methods for pipeline anticorrosion to evenly and densely coat the surface of the rust-removed metal pipeline with paint to isolate it from various corrosive media.

For seamless pipes that have been used for a long time, the oil sludge and rust in the pipes solidify, causing the original pipe diameter to become smaller. Hydrogen sulfide gas produced by sludge precipitation in the pipe will cause environmental pollution and easily cause explosion. The acid and alkali substances in the wastewater are easy to corrode the pipe wall. Improper removal of foreign matter in the pipeline will cause pipeline blockage.

Thermally expanded seamless steel pipe is a steel pipe (seamless steel pipe) with low density but strong shrinkage. The waste pipe finishing rolling process that expands the pipe diameter by cross rolling or drawing method. The outer diameter of the steel pipe can be expanded in a relatively short period of time, and non-standard special specifications and special-shaped seamless steel pipes can be produced. The advantages are low cost and high production efficiency. This is the current development trend in the field of pipe rolling in the world.

Spiral steel pipe (SSAW pipe) is a steel strip made of low-carbon carbon structural steel or low-alloy structural steel, rolled into a tubular shape according to a certain forming angle, and then welded and sewn.

Spiral pipe (SSAW) is a welded pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process.

Longitudinal rolling refers to the rolling method in which the main flow direction of the deformed metal is always the same as the forward direction of the rolled piece during the rolling process, that is, the deformed metal flows along the rolling centerline to the exit of the pipe mill in the deformed pass formed by the rolls.