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ERW Galvanized Pipe
ERW Galvanized Pipe
ERW Galvanized Steel Pipe, short for Electric Resistance Welded Galvanized Steel Pipe, is a type of ERW steel pipe that has been galvanized. The ERW process uses high-frequency current to heat the edges of a steel strip, which are then pressed together to create a weld. As a result, the most notable feature of ERW galvanized steel pipes is the straight weld seam running along the length of the pipe.
Compared to seamless steel pipe, ERW Galvanized Steel Pipe is more efficient due to a simpler manufacturing process, which generally results in lower costs and higher cost-effectiveness. With its good strength and corrosion resistance, it plays a vital role in many everyday and industrial applications.
Compared to seamless steel pipe, ERW Galvanized Steel Pipe is more efficient due to a simpler manufacturing process, which generally results in lower costs and higher cost-effectiveness. With its good strength and corrosion resistance, it plays a vital role in many everyday and industrial applications.
Product Specifications
| Parameter | Details |
| Material | Carbon Steel (commonly ASTM A53 Grade B, A106 Grade B) |
| Manufacturing Process | Electric Resistance Welding (ERW) + Hot-dip or Electro Galvanizing |
| Pipe Shape | Round |
| Outer Diameter (OD) | Typically 10 mm to 630 mm (customizable) |
| Wall Thickness | 1.0 mm to 12.5 mm (depending on size and standard) |
| Length | 6 m, 12 m standard; custom lengths available |
| Surface Treatment | Hot-dip galvanized or electro-galvanized coating |
| Zinc Coating Thickness | Hot-dip: 40–100 μm; Electro-galvanized: 5–20 μm |
| Welding Type | High-frequency electric resistance welding (ERW) |
| Tolerance | According to ASTM A53 or equivalent standards |
| Applicable Standards | ASTM A53, ASTM A106, API 5L, GB/T 3091, EN 10219 |
| End Types | Plain ends, beveled ends, threaded ends (customizable) |
| Applications | Water, gas transport, structural uses, scaffolding, fencing |
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More Details
Advantages
Strong Corrosion Resistance
Zinc coating protects steel from air and moisture, significantly slowing corrosion. Ideal for coastal and humid environments, with a much longer lifespan than standard ERW pipes.
Good Mechanical Strength
High-frequency welded with welds as strong as the base metal. Uniform thickness, excellent pressure, and impact resistance. Galvanizing has little effect on strength.
Cost Effective
Slightly higher production cost, but longer service life and low maintenance reduce overall cost.
Easy Maintenance
A smooth surface is easy to clean and requires no extra anti-corrosion treatment.
Applications
Construction: Scaffolding, handrails, fencing.
Water/Gas (Medium Pressure): Water lines, fire sprinklers.
General Fabrication: Frames, supports.
Manufacturing Process
Producing an ERW galvanized pipe involves these steps:
- A steel coil is unrolled and formed into a circular shape, then its edges are heated by a high-frequency current and pressed to create a straight weld seam.
- The welded pipe is straightened and cut to the specified length.
- The ERW pipe undergoes cleaning and pre-treatment to ensure a clean surface.
- The pipe is immersed in molten zinc (around 440-460°C), where the steel reacts to form a protective zinc-iron alloy layer with a pure zinc outer layer.
- Excess zinc is removed, the pipe is cooled, and the coating is inspected for quality.
Limitations and Considerations
Environmental Restrictions
The zinc coating can deteriorate rapidly under heavy mechanical impact, high temperatures (above 200 °C), or strong acidic or alkaline conditions. Not suitable for steam pipes or extreme environments.
Complex Production and Capacity Limits
Compared to regular ERW pipes, galvanized versions need more processing steps and stricter quality control, leading to longer production times, higher costs, and reduced capacity.
