According to the standard requirements, the dimensional inspection of seamless steel pipes mainly includes the wall thickness, outer diameter, length, curvature, ovality and end face shape of the steel pipe.

Welded pipe misalignment refers to the parallel deviation of the strip along the thickness direction due to the misalignment of the two edges of the strip at the forming butt joint of the steel pipe. The wrong side will cause the effective wall thickness of the steel pipe to decrease, which will affect the mechanical properties of the steel pipe to a certain extent. Due to the irreparability of the wrong side, the wrong side is one of the main factors causing the degradation of the steel pipe.

The hot extrusion process of seamless steel pipe is a pressure forming method, which is to place the tube blank in a pressure-resistant container, and apply external force to cause the tube blank to plastically deform under the state of three-dimensional compressive stress.

Because oil and gas pipelines are buried underground for a long time, they are very prone to corrosion problems due to soil, moisture and other factors. At present, pipeline corrosion in the petrochemical industry is mainly divided into two types:

Tension reduction rolling is the last hot rolling process in the production of seamless steel pipes, which plays a decisive role in the control of product quality.

UOE steel pipe forming process is one of the forming processes of LSAW steel pipe.The UOE production line adopts the Uing-Oing forming process. The formed steel pipe adopts five three-wire internal welding equipment and four three-wire external welding equipment.After welding, mechanical expansion or hydraulic expansion can be used to improve dimensional accuracy and remove internal stress according to user requirements.