GI ERW Pipes
A GI ERW Pipe (Galvanized Iron Electric Resistance Welded Pipe) is a mild steel pipe coated with zinc to prevent rust and corrosion. Manufactured through the ERW welding process and protected by hot-dip galvanizing, GI ERW Pipes offer excellent durability, long life, and resistance to moisture—making them ideal for water supply, plumbing, fencing, and outdoor structural applications.These galvanized ERW pipes are widely used across construction, fabrication, agriculture, and industrial sectors due to their corrosion resistance and cost-effectiveness. Their uniform zinc coating, smooth surface, and strong welded seam make GI ERW Pipe a preferred choice for long-term piping solutions.
About Our GI ERW Pipes
We supply high-quality GI ERW Pipes sourced from reputed manufacturers compliant with IS 1239, IS 3589, and ASTM standards. As stockists and distributors, we ensure consistent coating thickness, accurate dimensions, and superior mechanical performance suitable for residential, commercial, and industrial applications.
Key Features
- •Superior corrosion resistance
- •Long service life
- •Zinc coating protection
- •Low maintenance and cost effective
- •Strong ERW welded seam
Applications
- •Water distribution
- •Gas pipelines
- •Fire sprinkler systems
- •Agricultural irrigation
- •Insdustrial fluid conveyance
Size & Thickness Range
| diameter | thickness | use |
|---|---|---|
| 1/2” (15NB) to 4” (100NB) | 1.0mm – 5.4mm | Plumbing, scaffolding |
| 5” (125NB) to 6” (150NB) | 4.8mm – 5.4mm | Structural applications |
| 8” (200NB) to 20” (500NB) | 4.0mm – 9.5mm | Industrial & infrastructure |
| 22” (558.80mm OD) to 36” (914.40mm OD) | 5.0mm – 12mm | Heavy infrastructure projects |
Manufacturing Process
The formation of ERW pipes begins with mild steel strips being shaped, formed, and welded using high-frequency ERW technology, which creates a strong and uniform seam. Following this, the pipes undergo thorough surface preparation through cleaning, degreasing, acid pickling, and rinsing to ensure a perfectly clean steel surface before galvanizing. A subsequent flux treatment is then applied to improve zinc adhesion. The core protective step is hot-dip galvanizing, where the pipes are immersed in a molten zinc bath at approximately 450°C, forming multiple zinc-iron alloy layers that give GI ERW pipes their signature corrosion-resistant properties. Finally, in the cooling and finishing stage, the pipes are cooled, meticulously inspected, and supplied in standard lengths with a uniform, long-lasting zinc coating. This comprehensive, multi-stage process ensures that all resulting pipes qualify as high-performance galvanized ERW steel pipes.
GI ERW Pipe vs MS ERW Pipe
| Aspect | GI ERW Pipe | MS ERW Pipe |
|---|---|---|
| Coating | Zinc Coated | No Coating |
| Corrosion Resistasnce | Excellent | Moderate |
| Water Supply Suitability | Ideal | Requires coating |
| LifeSpan | 25-50 years | 5-15 years |
| Surface | Silver Zinc Finish | Black |
| Best Use | Plumbing,outdoor,moisture areas | Fabrication & Structural Works |
Quality Tests Performed
- Zink Coating Thikness Test
- Hydrostatic Pressure Test
- Weld Seam Strength Test
- Dimenstional Accuracy Test
- Salt Spray Corrosion Test
- Visual Surface Inspection
- Threading and Socketting Quality Test
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