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ERW hot-dip galvanized steel pipes come in two main types: pre-galvanized and hot-dip galvanized. The hot-dip galvanizing process enhances the pipes' corrosion resistance and extends their lifespan, making them a top choice for applications in construction, machinery, bridges, agricultural and oil machinery, and mining industry.
The hot-dip galvanized steel pipes are available in a variety of shapes including round, square, and rectangular to suit diverse application needs. These pipes come in a wall thickness range from 1mm to 17.5mm and the zinc coating on these pipes averages between 200g/m² to 600g/m², offering excellent protection against corrosion. We offer the flexibility of custom cut-to-length options ranging from 2m to 12m, accommodating specific project requirements.
Standard
- ASTM A53
- API 5L
- ASTM A795
- IS065
- BS1387
- GBT 3091 & GB/T13793
Applications
- Structural Pipe/ Structural Tubing
- Pipe Railing
- Scaffolding Pipe
- Fire Fighting Pipe
- Greenhouse Pipe
- Low Pressure Liquid Delivery Pipe
Size
- Outside Diameter:
Round tube: 21.3mm to 609.6mm
Square tube: 10×10mm to 200×200mm
Rectangular tube: 20×40mm to 300×500mm - Wall Thickness: 1mm to 17.5mm
- Zinc Coating: Average 200g/m² to 600g/m² (30μm-70μm)
- Length:
Regular length: 5.8m or 6m or 12m
Custom cut-to-length: 2m to 12m
- Plain End
- Beveled End
- Grooved End
- Threaded End
| DN | Designation of Thread | Outside Diameter | Wall Thickness | ||
| (mm) | (inch) | (mm) | (inch) | ||
| 15 | 1/2 | 21.40-21.00 | 0.843-0.827 | 1.80 | 0.071 |
| 20 | 3/4' | 26.90-26.40 | 1.059-1.039 | 2.00 | 0.079 |
| 25 | 1' | 33.80-33.20 | 1.331-1.307 | 2.00 | 0.079 |
| 32 | 1-1/4' | 4250-41.90 | 1673-1.650 | 2.00 | 0.079 |
| 40 | 1-1/2' | 48.40-47.80 | 1.906-1.882 | 2.3 | 0.091 |
| 50 | 2' | 60.20-59.60 | 2.370-2.346 | 2.30 | 0.091 |
| 65 | 2-1/2' | 76.00-7520 | 2.992-2.961 | 2.60 | 0.102 |
| 80 | 3' | 88.70-87.90 | 3.492-3.461 | 2.60 | 0.102 |
| 100 | 4' | 113.90-113.00 | 4.484-4.449 | 3.20 | 0.126 |
| DN | Designation of Thread | Outside Diameter | Wall Thickness | ||
| (mm) | (inch) | (mm) | (inch) | ||
| 15 | 1/2' | 21.40-21.00 | 0.843-0.827 | 2.00 | 0.079 |
| 20 | 3/4' | 26.90-26.40 | 1.059-1.039 | 2.30 | 0.091 |
| 25 | 1' | 33.80-33.20 | 1.331-1.307 | 2.60 | 0.102 |
| 32 | 1-1/4' | 4250-41.90 | 1.673-1.65 | 2.60 | 0.102 |
| 40 | 1-1/2' | 48.40-47.80 | 1.906-1.882 | 2.90 | 0.11 |
| 50 | 2' | 60.20-59.60 | 2.370-2.346 | 2.90 | 0.114 |
| 65 | 2-1/2' | 76.00-75.20 | 2.992-2.961 | 3.2 | 0.126 |
| 80 | 3' | 88.70-87.90 | 3.492-3.461 | 3.20 | 0.126 |
| 100 | 4' | 113.90=113.00 | 4.484-4.449 | 3.60 | 0.142 |
| DN | Designation of Thread | Outside Diameter | Wall Thickness | |||
| (mm) | (inch) | (mm) | (inch) | |||
| 15 | 1/2' | 21.70-21.10 | 0.854-0.831 | 2.6 | 0.102 | |
| 20 | 3/4' | 27.20-26.60 | 1.071-1.047 | 2.6 | 0.102 | |
| 25 | 1' | 34.20-33.40 | 1.346-1.315 | 3.2 | 0.126 | |
| 32 | 1-1/4' | 42.90-42.10 | 1.689-1.657 | 3.2 | 0.126 | |
| 40 | 1-1/2' | 48.80-48.00 | 1.921-1.890 | 3.2 | 0.126 | |
| 50 | 2' | 60.80-59.80 | 2.394-2.354 | 3.6 | 0.142 | |
| 65 | 2-1/2' | 76.60-75.40 | 3.016-2.969 | 3.6 | 0.142 | |
| 80 | 3' | 89.50-88.10 | 3.524-3.469 | 4 | 0.157 | |
| 100 | 4' | 114.90-113.30 | 4.524-4.461 | 4.5 | 0.177 | |
| 150 | 6' | 166.10-164.10 | 6.539-6.461 | 5 | 0.197 | |
| NPS | Outside Diameter | Wall Thickness | ||
| (mm) | (inch) | (mm) | (inch) | |
| 1/2' | 21.30 | 0.840 | 2.77 | 0.109 |
| 3/4' | 26.70 | 1.050 | 2.87 | 0.113 |
| 1' | 33.40 | 1.315 | 3.38 | 0.133 |
| 1-1/4' | 42.20 | 1.660 | 3.56 | 0.140 |
| 1-1/2' | 48.30 | 1.900 | 3.68 | 0.145 |
| 2' | 60.30 | 2.375 | 3.91 | 0.154 |
| 2-1/2' | 73.00 | 2.875 | 5.16 | 0.203 |
| 3' | 88.90 | 3.500 | 5.49 | 0.216 |
| 4' | 114.30 | 4.500 | 6.02 | 0.237 |
| 6' | 168.30 | 6.625 | 7.11 | 0.280 |
| 8' | 219.10 | 8.625 | 8.18 | 0.322 |
- Incoming Inspection
- Workpiece Loading
- Skimming
- Alkali Washing
- Water Washing
- Pickling
- Water Rinsing
- Soaking
- Tumover& Hanging
- Hot-Dip Galvanizing
- Residual Zinc Removing
- Water Cooling
- Inspection& Trimming
- Quality Control
- Marking
- Storage
- Delivery
High-quality Zinc Coating on Steel Pipes
- Surface inspection: Each pipe is visually inspected for consistency and quality of the internal and external galvanized surfaces.
- Dimensional accuracy: Dimensions are precisely measured on the base material before galvanizing to ensure accurate and consistent specifications.
- Zinc layer uniformity: To ensure uniformity, the galvanized pipes undergo a zinc layer uniformity test, where a sample pipe must withstand five consecutive dips in a copper sulfate solution without turning red.
