Tianjin Brisk Steel is one of the manufacturers of Circular Hollow Section (CHS) / Round Hollow Section Pipe in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
Product Overview & Key Features
Circular Hollow Section (CHS), also known as round hollow section steel pipe or round structural tube, is a tubular structural steel product formed by ERW (Electric Resistance Welding) or SSAW (Spiral Submerged Arc Welding) processes. Its round cross-section provides uniform strength distribution in all directions, making it a preferred choice for structural, piping, and mechanical applications, including flagpoles, transmission towers, and offshore structures.
Key Features
- Uniform circular cross-section for even stress distribution in all directions
- Available via ERW (small–medium diameter) and SSAW (large diameter) welding processes
- Excellent for both structural support and fluid conveyance
- High pressure-bearing capacity for piping applications
- Complies with ASTM A500/A53, EN 10219, EN 10210, and API 5L standards
CHS Size Chart & Wall Thickness
| Outer Diameter (mm) | Wall Thickness | Standard Length | Approx. Weight (kg/m) |
|---|---|---|---|
| 21.3 – 48.3 | 2.6–3.2mm | 6m / 12m | 1.2–3.6 |
| 60.3 – 88.9 | 3.2–5.0mm | 6m / 12m | 4.4–10.3 |
| 114.3 – 168.3 | 4.0–6.0mm | 6m / 12m | 13.5–24.0 |
| 219.1 – 323.9 | 6.0–10.0mm | 6m / 12m | 31.5–77.4 |
| Up to 1420mm | up to 60mm | Customizable | On request |
- Please contact us for further specifications.
Formulas and Applications
CHS Weight Calculation Formula Weight (kg/m) = (OD − t) × t × 0.0246615
Where OD = outer diameter, t = wall thickness (mm). This round hollow section weight formula is the same one used for standard CHS weight charts and pipe schedule tables - handy for verifying supplier quotes or estimating tonnage for a custom OD not covered in your CHS size chart.
Applications Structural columns and piling, scaffolding tube, pipeline transportation, handrails and fencing, street lighting poles, flagpoles and transmission towers, offshore platform bracing, and mechanical/automotive components.
Frequently Asked Questions (FAQ)
Q: What is CHS pipe used for?
A: Circular Hollow Section (CHS) is used as structural columns, scaffolding, handrails, flagpoles, transmission towers, and piping - anywhere uniform strength in all directions and good torsional resistance are needed.
Q:What's the difference between CHS and standard steel pipe?
A: CHS is manufactured and tested to structural standards (EN 10210/10219, ASTM A500) for load-bearing use, whereas ordinary pipe may be produced to fluid-conveyance standards (ASTM A53) with different tolerances.
Q:How do I find CHS weight per metre?
A:Use the formula above or check our circular hollow section weight chart / weight calculator for standard OD and wall thickness combinations.
Q: What sizes does round hollow section come in?
A: Standard CHS outside diameters range from about 21.3mm up to 508mm in stock sizes, with larger custom OD up to 800mm available via SSAW production.
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