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Recent market trends for spiral steel pipes

2019/08/29

Recent market trends for spiral steel pipes

Recently, railway construction has once again become a focal point, entering a new phase of rapid development. The renewed surge in western China’s railway projects is driving overall regional economic growth. Meanwhile, urban rail transit construction is also accelerating. Together, railway and urban rail‑transit projects are poised to serve as key engines of near‑term economic expansion, which will positively boost demand for related steel products.

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How to assess the quality of anti-corrosion spiral steel pipes

2019/08/29

How to assess the quality of anti-corrosion spiral steel pipes

When the material of an anti-corrosion spiral steel pipe comes into contact with a grinding wheel, it produces distinct sparks. By observing these sparks, we can identify the specific material of the anti-corrosion spiral steel pipe. This method can be used to test anti-corrosion spiral steel pipe strips, plates, bars, wires, and pipes…

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Common Knowledge About Anti-Corrosion Spiral Pipes for Water Supply Pipelines

2018/08/30

Common Knowledge About Anti-Corrosion Spiral Pipes for Water Supply Pipelines

A city’s water supply volume is extremely large. As a result, when tap water flows through steel pipes, it exerts significant pressure on the pipeline. Under such conditions, ordinary steel pipes are prone to damage. In contrast, spiral‑welded steel pipes, thanks to their exceptional toughness, can withstand much higher pressures. Moreover, conventional steel pipes are susceptible to rust. For IPN8710 potable‑water pipelines, the quality of the internal anti‑corrosion coating is a primary concern for purchasers. The overall quality depends mainly on material grade, compliance with relevant standards, wall thickness, and weld integrity. When materials and standards are identical, wall thickness and weld quality become the key factors in assessing pipe performance. Given the wide range of applications for spiral‑welded steel pipes—such as support structures and water‑conveyance systems—even minor defects can compromise these projects; in severe cases, they may directly jeopardize public safety. Currently, most spiral‑welded pipes on the market exhibit wall‑thickness deviations, so products with narrower deviation ranges generally offer superior quality, greater pressure resistance, and stronger structural integrity. Weld quality is typically evaluated visually or by nondestructive testing; welds free of porosity and exhibiting uniformity are considered high‑grade.

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3PE-coated steel pipe for wastewater treatment

2018/08/30

3PE-coated steel pipe for wastewater treatment

3PE‑coated steel pipes: The 3PE coating is ideally suited for pipeline protection in complex terrains and under severe corrosion conditions. In oilfield construction, 3PE‑coated pipes have come to dominate applications in domestic oil, water, and gas transmission projects, thanks to their outstanding chemical resistance, superior mechanical protection, and long service life. These products are widely used in pipeline systems across industries including petroleum, natural gas, chemicals, power generation, defense, shipbuilding, papermaking, heating, water supply and drainage, hydropower stations, piling, bridge construction, and steel structures, earning consistent acclaim from a broad range of users.

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How are large-diameter spiral steel pipes manufactured?

2018/08/30

How are large-diameter spiral steel pipes manufactured?

Spiral pipes, also known as spiral steel pipes or spiral welded pipes, are manufactured by rolling low-carbon structural steel or low-alloy structural steel strips into a tubular blank at a specific helical angle—referred to as the forming angle—and then welding the seam. This process enables the production of large-diameter steel pipes from relatively narrow steel strips.

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Material Analysis of Spiral Welded Steel Pipes in Guangxi

2018/07/13

Material Analysis of Spiral Welded Steel Pipes in Guangxi

The main material grades of spiral welded steel pipes include: Q235A, Q235B, 20#, Q345 (16Mn), L245(B), L290 (X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450 (X65), L485 (X70), L555 (X80), L290NB/MB (X42N/M), L360NB/MB (X52N/M), L390NB/MB (X56N/M), L415NB/MB (X60N/M), L450MB (X65), L485MB (X70), and L555MB (X80).

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Guangxi Nanning Spiral Pipe Factory Shares Knowledge 1

2018/07/13

Guangxi Nanning Spiral Pipe Factory Shares Knowledge 1

Types of spiral welded pipes: Spiral welded pipes generally have higher strength than straight-seam welded pipes. They can produce larger-diameter pipes from narrower billets and can also manufacture pipes of different diameters using billets of the same width. However, compared with straight-seam pipes of the same length, spiral welded pipes have a weld seam that is 30% to 100% longer, and their production speed is lower. Consequently, smaller-diameter welded pipes are typically manufactured using the straight-seam process, while larger-diameter pipes predominantly employ the spiral-welded method.

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Guangxi Nanning Spiral Pipe Factory Shares Knowledge 1

2018/07/13

Guangxi Nanning Spiral Pipe Factory Shares Knowledge 1

Types of spiral welded pipes: Spiral welded pipes generally have higher strength than straight-seam welded pipes. They can produce larger-diameter pipes from narrower billets and can also manufacture pipes of different diameters using billets of the same width. However, compared with straight-seam pipes of the same length, spiral welded pipes have a weld seam that is 30% to 100% longer, and their production speed is lower. Consequently, smaller-diameter welded pipes are typically manufactured using the straight-seam process, while larger-diameter pipes predominantly employ the spiral-welded method.

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Guangxi Nanning Canghai Steel Co., Ltd. All rights reserved

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