Hot-Dip Galvanized Steel Pipe
Hot-Dip Galvanized Steel Pipe Hot-Dip Galvanized Steel Pipe Hot-Dip Galvanized Steel Pipe

ERW Hot-Dip Galvanized Steel Pipe

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.

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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
  • Hot-Dip Galvanized Steel Pipe Plain End
  • Hot-Dip Galvanized Steel Pipe Beveled End
  • Hot-Dip Galvanized Steel Pipe Grooved End
  • Hot-Dip Galvanized Steel Pipe Threaded End
Specifications
BS 1387-85 XL
BS 1387-85L
BS 1387-85 M
ASTM A53 GRADE A SCH40
British Standards: BS 1387-85 XL
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
British Standards: BS 1387-85L
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
British Standards: BS 1387-85 M
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
ANSI Standards: ASTM A53 GRADE A SCH40
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.
  • Hot-Dip Galvanized Steel Pipe
  • Hot-Dip Galvanized Steel Pipe
  • Hot-Dip Galvanized Steel Pipe
  • Hot-Dip Galvanized Steel Pipe
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Steel Tube Manufacturer

Established in 2003, China Steel Pipe Group Corp.,Ltd . is a manufacturer in the steel pipes and PC strand wire industry. Our primary products include ERW pipes, SSAW pipes, LSAW pipes, high-precision welded pipes, prestressed steel wires, and prestressed steel strands. We also offer extensive processing services such as welding, grooving, threading, painting, and coating to meet your specific requirements. Our steel products are widely used in firefighting, cable management, material transportation, steel structures, railings, piling, construction, and machinery manufacturing.

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  • Annual production capacity reaches 500,000 tons.
  • Stainless steel processing experience 21 years
  • Production scale houses more than 20 production lines