Thick walled spiral welded steel pipeIt refers to a spiral steel pipe with a slightly thicker wall thickness compared to a regular spiral steel pipe. Compared to ordinary spiral steel pipes, the advantages are high compressive strength, high impact strength, high safety performance, and longer service life. The execution standards include 50379711 and API

Forming process of thick walled spiral welded steel pipe

1. Before forming the spiral steel pipe

Spiral steel pipes are made using advanced double-sided submerged arc welding technology, which can achieve welding at the optimal position without defects such as misalignment, welding deviation, and incomplete penetration, making it easy to control the welding quality and position. Spiral steel pipes adopt special welding processes, which can achieve welding at the optimal welding position without any errors or defects, ensuring the qualification and quality of spiral steel pipes.

2. Spiral steel pipe forming process

During the forming process of spiral steel pipes, the steel plate should deform uniformly, with minimal residual stress and no scratches on the surface. Therefore, the selection of steel plates for making spiral steel pipes should be careful, with a uniform surface and no scratches. The processed thick walled spiral welded steel pipes have greater flexibility in the size specifications of diameter and wall thickness, especially in the production of high-grade thick walled pipes, especially small and medium-sized thick walled pipes. They have advantages that other processes cannot compare with, and can meet more requirements of users in terms of spiral steel pipe specifications.

Calculation formula for theoretical weight per meter of spiral steel pipe

The delivery time for spiral steel pipes is divided into actual weight delivery or theoretical weight delivery

Actual weight - At the time of delivery, the product weight is delivered based on the weighing (weighing) weight;

Theoretical weight - At the time of delivery, the weight of the product is calculated based on the nominal size of the steel. The calculation formula is as follows (for those who require delivery by theoretical weight, it should be specified in the contract):

The theoretical weight per meter of spiral steel pipe (with a steel density of 7.85kg/dm3) is calculated using the formula W=0.02466 (D-S) S

In the formula: W - theoretical weight per meter of spiral steel pipe, kg/m；

D - nominal outer diameter of spiral steel pipe, mm；

S - nominal wall thickness of spiral steel pipe