Comparison between straight seam welded pipe and spiral welded pipe

Welded steel pipe, also called welded pipe, is a steel pipe made of steel plates or strips that are welded after being curled and formed. The length is usually 6 meters. The production process of welded steel pipes is simple, the production efficiency is high, and there are many varieties and specifications. According to the forming process, it is divided into spiral welded pipe and straight seam welded pipe.

Straight seam welded pipe: The steel pipe made of hot-rolled or cold-rolled steel plate or steel strip coil welding and straight seam welded on the welding equipment is called straight seam welded pipe.

Spiral welded pipe: It is made by rolling low-carbon carbon structural steel or low-alloy structural steel strips into pipe blanks at a certain spiral angle (forming angle), and then welding the pipe seams. It can be made of narrower strips Steel produces large diameter steel pipes.

Spiral welded pipes are mainly used for oil and natural gas transmission pipelines, and their specifications are expressed by outer diameter × wall thickness. Spiral welded pipes are either single-sided or double-sided. Welded pipes should ensure that the hydraulic pressure test, tensile strength and cold bending performance of the weld meet the regulations.

Comparison between straight seam pipe and spiral pipe:

1. The production process of straight seam welded pipe is simple, high production efficiency and low cost.

2. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width;

3. Compared with straight seam pipes of the same length, the weld length is increased by 30 to 100%, and the production speed is lower;

Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding.

Editor: Lucas

Mail: lucas@yangtzesteel.com