Galvanized steel pipes are among the most commonly exported steel products from China, widely used in construction, plumbing, industrial frameworks, and infrastructure projects worldwide. One of the key factors buyers evaluate before placing orders is pipe size and weight, as this affects structural compatibility, freight cost, and material planning.
This comprehensive guide explains standard galvanized steel pipe sizes, how weights are calculated, and export specifications Chinese manufacturers typically offer - optimized for global SEO and B2B search intent.
Standard Galvanized Steel Pipe Sizes
Galvanized steel pipes are usually sized by Nominal Diameter (DN) and specified in both metric (mm) and imperial (inch) units.
| Nominal Size (DN) | Imperial Size (in) | Outside Diameter (mm) |
|---|---|---|
| DN15 | ½″ | 21.3 |
| DN20 | ¾″ | 26.9 |
| DN25 | 1″ | 33.7 |
| DN32 | 1¼″ | 42.4 |
| DN40 | 1½″ | 48.3 |
| DN50 | 2″ | 60.3 |
| DN65 | 2½″ | 76.1 |
| DN80 | 3″ | 88.9 |
| DN100 | 4″ | 114.3 |
| DN125 | 5″ | 141.3 |
| DN150 | 6″ | 168.3 |
| DN200 | 8″ | 219.1 |
| DN250 | 10″ | 273.0 |
| DN300 | 12″ | 323.9 |
How Galvanized Steel Pipe Weight is Calculated
The weight of a steel pipe depends on its outer diameter (OD) and wall thickness (WT).
📌 Weight Formula (General)
Pipe Weight (kg/m) = (OD − WT) × WT × 0.02466
Where:
OD = Outside diameter (mm)
WT = Wall thickness (mm)
0.02466 = Steel density constant (kg/mm² per meter)
This formula helps buyers and exporters quickly estimate weight for freight, packaging, and costing.
Typical Weight Table
| Nominal Size (DN) | OD (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|
| DN25 | 33.7 | 3.0 | 2.31 |
| DN40 | 48.3 | 3.5 | 4.01 |
| DN50 | 60.3 | 4.0 | 6.18 |
| DN65 | 76.1 | 4.5 | 9.72 |
| DN80 | 88.9 | 5.0 | 12.91 |
| DN100 | 114.3 | 6.0 | 18.69 |
| DN150 | 168.3 | 7.1 | 31.91 |
| DN200 | 219.1 | 8.0 | 47.00 |
Common Wall Thickness Standards
Chinese exporters usually manufacture galvanized steel pipes in the following wall thickness ranges depending on application:
| Application Type | Wall Thickness Range (mm) |
|---|---|
| Light duty / indoor use | 2.0–3.5 |
| Medium structural | 3.5–6.0 |
| Heavy structural / high-pressure | 6.0–12.0+ |
Stronger and thicker walls are often used for scaffolding, infrastructure, and industrial fluid transport.
Export Specification Options from China
Chinese galvanized pipe manufacturers often offer:
✔ Hot-Dip Galvanized Pipes with high zinc coating thickness (typically ≥ 60 µm)
✔ Pre-Galvanized Pipes for indoor & light-duty use
✔ Customized Lengths – typically 5.8m, 6m, or cut-to-length (as per order)
✔ Standard Compliance: ASTM, EN, JIS, ISO
✔ Mill Test Certificates (MTC) and Third-Party Inspection (SGS, BV, Intertek)
Packaging & Shipping Weight Considerations
For export, galvanized steel pipes are typically packaged as:
Bundled with steel straps
Wrapped in waterproof paper
Loaded in containers with protective caps on pipe ends
Export weight calculations should consider:
➡ Pipe weight per meter × total meters
➡ Packing materials
➡ Container load max weight limits (20′ / 40′ containers)
This affects freight cost, FOB price, and CIF planning.
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Buyer Tips: How to Request Accurate Quotes
When sourcing galvanized steel pipes, always include in your RFQ:
✅ Nominal size (DN or inch)
✅ Wall thickness (mm)
✅ Length (fixed or random)
✅ Coating type (hot-dip or pre-galvanized)
✅ Standard requirement (ASTM / EN / JIS)
✅ Required weight per meter or total weight
This ensures Chinese suppliers provide precise pricing and delivery details.
