Seamless pipeline pipes are manufactured through an integrated molding process, offering enhanced strength and reliability, suitable for high-pressure, high-temperature, or highly corrosive environments. The processing technology mainly includes the following steps:
Raw Material Preparation
Select high-quality round steel billets and cut them to specified lengths according to pipe diameter and wall thickness requirements.
Heating and Piercing
The billets are heated to high temperatures (approximately 1200°C) to achieve a plastic state.
A hollow blank tube is formed by piercing the center of the steel billet with a piercing machine.
Rolling and Stretching
Hot Rolling ProcessFor large and medium diameter seamless pipes, the blank pipe is heated and rolled through roller mills to achieve the desired dimensions.
Cold Drawing ProcessSuitable for small-diameter seamless pipes, the process involves multi-pass cold drawing (grasping the pipe end and pulling outward) to gradually reduce the diameter and wall thickness, thereby improving accuracy.
Heat Treatment
Annealing or normalizing treated pipes after rolling or stretching to relieve internal stresses, improve microstructure, and enhance mechanical properties.
Straightening and Cutting
By using straightening machines, we eliminate pipe curvature to ensure straightness.
Cut pipe materials to standard length and process end surfaces (such as beveling and chamfering).
Inspection and Packaging
Conduct non-destructive tests such as hydrostatic testing and ultrasonic flaw detection to ensure quality.
Qualified products are cleaned, marked, and then packaged for storage.