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Steel Pipe Knowledge

Steel Pipe Knowledge

How to Select Spiral Pipes for Wastewater Treatment

2022/02/28

How to Select Spiral Pipes for Wastewater Treatment

The selection of spiral‑wound pipes should be guided by economic considerations. Higher‑grade steel pipes are slightly more expensive but can be made thinner; lower‑grade pipes are marginally cheaper but require thicker walls, so a cost‑benefit comparison is necessary. From the outlet to the inlet, varying wall thicknesses—two or three distinct grades—may be employed in response to pressure changes, with different wall thicknesses assigned to different pipe grades. For example, the outlet section might use a higher‑grade material, while the inlet section uses a lower‑grade material. Since piping costs account for roughly 25% of the total project investment, material selection must be carefully optimized.

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Composition and Manufacturing of Steel Plate Spiral Pipes

2021/12/28

Composition and Manufacturing of Steel Plate Spiral Pipes

How are steel plate rolled pipes manufactured, and what applications do they serve? Steel plate rolled pipes primarily consist of a roller, a roller shaft, a gear‑disc adapter (or large gear), a roller hub, a bearing housing, and bearings.

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Factors Affecting the Gap Size in Steel Plate Spiral Welded Pipes

2021/12/01

Factors Affecting the Gap Size in Steel Plate Spiral Welded Pipes

The quality of steel plate spiral-welded pipes is significantly influenced by weld‑seam dimensions, which are determined by a combination of factors, including welding process parameters, the shape and positioning of the welding wire, flux flow rate, flux performance, and the geometry of the welded seam.

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What is the bend test for steel plate rolled pipes used to assess?

2021/11/16

What is the bend test for steel plate rolled pipes used to assess?

The bend test for steel plate rolled pipes is primarily used to determine the bending strength of brittle and low‑ductility materials (such as cast iron, high‑carbon steel, and tool steel) and to assess deflection, which serves as an indicator of ductility. The bend test can also be employed to evaluate the surface quality of the material.

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What causes deformation in steel plate rolled pipes?

2021/11/08

What causes deformation in steel plate rolled pipes?

Steel plate spiral pipes are typically manufactured by straight-seam or helical-seam welding, with a fundamentally similar roll-forming process: shearing (or cutting) → beveling → flipping the steel plate → rounding the ends into arcs → forming large-diameter coils (including spot welding) → butt-jointing pipe sections (including spot welding) → welding the circular ends (using automatic welding).

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High-frequency welding of steel plate spiral pipes

2021/10/27

High-frequency welding of steel plate spiral pipes

The skin effect and proximity effect of alternating current are applied to high-frequency welding of steel plate‑rolled tubes. After roll forming, the steel strip is shaped into a circular tube blank with a fragmented cross‑section. One or a set of resistors (magnetic rods) rotates near the center of the induction coil inside the tube blank, establishing an electromagnetic induction circuit between the resistor and the open edge of the blank. Under the influence of the skin and proximity effects, intense localized heating occurs at the edges of the tube blank’s opening, rapidly raising the weld seam edges to the temperature required for welding.

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Production process of steel plate spiral pipes

2021/10/08

Production process of steel plate spiral pipes

Prior to layout for steel‑plate coiled pipe fabrication, the steel plates must be inspected and aligned using a steel tape measure, and the layout dimensions shall be calculated based on the coil’s nominal diameter. Following layout, punch holes in the steel plates using a template and mark the plate’s centerline. Grooving of the pipe edges shall be performed by mechanical means; thermal processes such as plasma arc or oxy‑acetylene flame may also be employed.

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What causes fractures in spiral tubes?

2021/09/06

What causes fractures in spiral tubes?

During the cold drawing of spiral‑wound tubes, cracks that arise during operation—often due to defects such as cracks in the hot‑rolled tube billet or issues with high‑precision cold‑drawn tubes used to manufacture hydraulic cylinders—are typically brittle fractures, with little to no plastic deformation. Brittle fracture in welded steel pipes can be attributed to a variety of factors.

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