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Moisture-Proof Measures for Spiral Steel Pipes in Summer

2021/05/19

Moisture-Proof Measures for Spiral Steel Pipes in Summer

Spiral steel pipe (steel‑jacketed, steel‑insulated pipe) manufacturers shall strengthen moisture testing of raw materials prior to storage, strictly adhere to the requirements of the “Quality Inspection Procedures for Raw Materials Prior to Storage,” and conduct individual inspections of all materials. Moisture content must be verified; any products that fail inspection shall not be stored and must be re‑packaged with waterproof materials and covered with waterproof tarpaulins, while transport management should be further enhanced.

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Applications and Characteristics of Spiral Welded Steel Pipes

2021/05/16

Applications and Characteristics of Spiral Welded Steel Pipes

Spiral welded steel pipes are widely used in various structural components, tools, and machine parts. Compared with circular pipes, shaped pipes typically exhibit larger moments of inertia and section moduli, as well as greater resistance to bending and torsion, thereby significantly reducing structural weight and saving steel.

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Causes of Rust Spots on the Surface of Spiral Welded Steel Pipes

2021/05/13

Causes of Rust Spots on the Surface of Spiral Welded Steel Pipes

Spiral welded pipe is produced by feeding strip steel into the welding unit and passing it through a multi-roll forming process. Subsequently, the strip is gradually rolled into a circular tube blank with an open gap. The diameter of the pressure rolls is adjusted to maintain the weld gap within 1 to 3 mm and to ensure that both ends of the weld are flush.

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Requirements for the Quality of Bevels on Anti-Corrosion Spiral Steel Pipes

2021/05/10

Requirements for the Quality of Bevels on Anti-Corrosion Spiral Steel Pipes

In the inspection procedures for corrosion‑resistant spiral steel pipes, one specific test is the groove inspection. The pipe groove plays a critical role during fabrication, installation, and welding; conforming to the relevant standards ensures greater efficiency in subsequent construction and welding operations. The most common type of groove for these pipes is the V‑groove. So, what exactly is a V‑groove?

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Causes of Ovality in Spiral Welded Steel Pipes and Corresponding Solutions

2021/05/07

Causes of Ovality in Spiral Welded Steel Pipes and Corresponding Solutions

After production, the cross-section of spiral welded steel pipe should be close to circular. The ovality tolerance requires that the major outer diameter not exceed the nominal outer diameter by more than 1%, and the minor outer diameter not fall below the nominal outer diameter by more than 1%. If the pipe ends are elliptical, they will not align properly during field butt welding. So, what types of spiral welded steel pipes are prone to developing ovality?

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What should be noted during the hot working of spiral steel pipes?

2021/04/29

What should be noted during the hot working of spiral steel pipes?

If oil adheres to the surface of a spiral steel pipe during heating, the oxide scale in the oily areas will differ in thickness and composition from that on other parts, and carburization may occur. The base metal beneath the oxide scale that has undergone carburization will be severely attacked by acid. Oil droplets sprayed from heavy‑oil burners at the start of combustion can also have a significant adverse effect if they land on the workpiece. Similarly, operator fingerprints left on the workpiece can cause problems. Therefore, operators should avoid directly touching stainless‑steel components with their bare hands and must prevent the workpieces from becoming contaminated with fresh oil or grease. All handling must be performed while wearing clean gloves.

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What material is best for manufacturing spiral tubes?

2021/04/20

What material is best for manufacturing spiral tubes?

Spiral pipes can be manufactured from a wide variety of materials, and these alloy grades often differ significantly in quality. Therefore, making an informed material selection is crucial. This aspect deserves close attention: reputable spiral pipe manufacturers excel in choosing the right materials, which consistently earns them customers’ favor.

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Quality Inspection Methods for Spiral Welded Steel Pipes

2021/04/17

Quality Inspection Methods for Spiral Welded Steel Pipes

On the surface, that is, during visual inspection, the visual examination of spiral steel pipe weld joints is a simple and widely used method, serving as an important component of final‑product inspection. Its primary purpose is to identify surface defects and dimensional deviations in the welds, typically carried out by naked eye observation, aided by standard templates, gauges, and magnifying glasses. If defects are found on the surface of a spiral steel pipe weld, there is a corresponding likelihood that internal defects may also be present.

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