High precision, high smoothness, no oxide layer on the inner and outer walls of the steel pipe after heat treatment, good cleanliness of the inner wall, high-pressure flushing with specialized equipment for the inner hole of the steel pipe, and rust prevention oil for the inner and outer walls of the steel pipe. Steel pipes can withstand high pressure, undergo cold bending without deformation, and can be used as raw materials for various complex deformations and mechanical processing.

The tolerance for outer diameter and inner hole size is ± 0.05mm, and the surface quality of the advanced inner cavity is Q-grade. The normal working pressure is 20Mpa, and the test pressure reaches 60Mpa. Cold bending 180 °, its surface is smooth without cracks.

Widely used in hydraulic systems, automotive oil circuits, bearings, and other industries that require extremely high precision, smoothness, and mechanical performance of steel pipes.