Spiral Pipe Manufacturer: Common Causes of Deformation in Spiral Pipe Production
Release date:
2021-01-23
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What are the common causes of problems in spiral pipe production? During smelting or hot working, certain factors—such as non-metallic inclusions, gases, improper process selection, or incorrect operating procedures—can lead to defects within the steel or on its surface. These defects severely compromise the quality of the material or product and may even result in scrap. Common defects in spiral welded pipes and their causes include porosity, blowholes, shrinkage cavities, residual defects, non-metallic inclusions, segregation, white spots, cracks, and various abnormal fracture‑related flaws. All of these can be identified through macroscopic examination, which includes acid‑etching inspection and fracture analysis.
Spiral tube What are the causes of common production problems? During smelting or hot working, certain factors—such as nonmetallic inclusions, gases, improper process selection, or inadequate operating procedures—can give rise to defects within the steel or on its surface, severely compromising the quality of the material or product and, in some cases, leading to scrap. Common defects in spiral welded pipes and their underlying causes include porosity, blowholes, shrinkage cavities, residual defects, nonmetallic inclusions, segregation, white spots, cracks, and various abnormal fracture‑related flaws. These can all be identified through macroscopic examination, which comprises two methods: acid etching and fracture‑surface inspection. The following section briefly outlines the typical macroscopic defects revealed by the acid‑etching technique.
1. Causes of segregation in spiral tubes:
During the casting and solidification process, crystallization and diffusion—factors that enterprises can deliberately control—can lead to the segregation of certain chemical elements, resulting in compositional non-uniformity. Depending on the location of such segregation, it can be classified into ingot-type, center-type, and point-type segregation, among others.
Macroscopic characteristics
On acid‑etched specimens, when segregation consists of etchable phases or gaseous inclusions, the features appear dark in color, irregular in shape, slightly depressed with a flat base and numerous closely spaced micropores. In contrast, if the segregation comprises corrosion‑resistant elements, the features exhibit a lighter color, irregular morphology, and relatively smooth, slightly raised micro‑protrusions.
2. Causes of Porosity in Spiral Tubes
During hot working, gaps arising from the solidification shrinkage of low-melting-point materials and gas evolution prevent weldability in steels. Based on their distribution characteristics, these defects can be classified into two main types: center‑line porosity and general porosity.
Macroscopic characteristics
On the transverse hot-acid‑etched surface, the pores appear as irregular polygons—deep pits with narrow, pointed bases. Such varied pit morphologies often give rise to additional segregation spots within the material; in severe cases, they may coalesce into a sponge‑like structure.
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