After the precision bright seamless tube is heat-treated to obtain austenite, it is quenched at a temperature range of 450-600 °C. Or go through 350-600°C at a slow cooling rate after quenching at 650°C. Or after quenching at 650°C, 16Mn seamless steel pipes and 16Mn seamless steel pipes are heated for a long time in the temperature range of 350-650°C, which will cause aging of precision bright tubes.

The cross-rolling process of seamless pipes is a rolling process in which the rolled piece rotates along its own axis, deforms, and advances between two or three rolls with the same rotation direction and intersecting (or inclined) longitudinal axes.

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.