Spiral steel pipe

Bending in the fabrication of spiral‑welded steel pipes: Sheet material can be bent through 180°; however, to minimize cracking on the curved surface, the bend radius should be at least twice the plate thickness. For thick plates, the bend radius is specified twice—once along the rolling direction and perpendicular to it. In welding applications, a bend radius of four times the plate thickness is recommended. To prevent cracking during fabrication, the weld area should be ground smooth. As for repairing cracks in spiral‑welded pipes, stainless steel with heat‑resistant properties is often employed. This material exhibits excellent oxidation resistance and corrosion resistance, making it well suited for alkali‑service piping in ion‑membrane electrolysis. Nevertheless, due to the stringent technical requirements of the material, any deficiencies—such as incomplete alloying elements in the base metal, inadequate filler materials, improper welding procedures, adverse operating conditions, corrosive media within the pipeline, or residual working stresses—can lead to serious defects and pose significant safety risks. Therefore, crack repair remains an effective maintenance approach.

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Spiral steel pipe

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Product Description

　　Bending of spiral steel pipes and spiral welded pipes: Sheet material can be bent through 180°; however, to minimize cracking on the curved surface, the bending radius should be at least twice the material thickness. For thick plates, the allowable bending radius is specified twice—once along the rolling direction and perpendicular to it. In cases involving welding, a bending radius of four times the plate thickness must be provided. To prevent cracking during fabrication, the surfaces in the weld zone should be ground smooth.
　　The crack‑repair welding method for spiral welded pipes is a type of stainless‑steel heat‑resistant welding. It boasts excellent oxidation resistance and corrosion resistance, making it widely used in alkali pipelines for ion‑membrane electrolysis. However, due to the stringent technical requirements of the material, any deficiencies—such as incomplete alloying elements in the base metal, inadequate filler materials, improper welding procedures, adverse operating conditions, corrosive media within the pipeline, or residual working stresses—can give rise to serious defects and pose significant safety risks. Therefore, crack repair represents an effective maintenance approach.

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