ERW Hot-Dip Galvanized Steel Pipe

ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
ERW Hot-Dip Galvanized Steel Pipe
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Welded steel pipe with a protective coating of zinc

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

Pipe End
  • Plain End
  • Beveled End
  • Grooved End
  • Threaded End
Specifications
BS 1387-85 XL
BS 1387-85L
BS 1387-85 M
ASTM A53 GRADE A SCH40
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
ERW Galvanized Steel Pipe Production Process
  • 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.
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