CHSSteel
Circular hollow sections (CHS) — structural steel pipe for columns, handrails and architectural features.
Circular hollow section (CHS) is cold-formed structural steel pipe with a round profile, used for columns, handrails, architectural features and general structural work. We supply CHS across the full range of nominal bore and outside-diameter sizes, in wall thicknesses to suit, manufactured to AS/NZS 1163 in Grade C350L0. Available black or galvanised with mill test certificates and full traceability.
Product Range
Full Size Range
CHS in outside diameters from 21.3mm to 508mm in wall thicknesses to suit structural and architectural use.
Structural Grade
Manufactured to AS/NZS 1163 in Grade C350L0 for verified strength and weldability.
Black & Galvanised
Supplied black (oiled) or pre-galvanised for corrosion protection in exposed applications.
Architectural & Structural
Smooth round profile suited to exposed columns, handrails, balustrades and feature steelwork.
Cut-to-Length
Cutting to your specified lengths with section properties available for design.
CHS (Circular Hollow Section) Sizes
Common Australian CHS sizes to AS/NZS 1163 in Grade C350L0, listed by nominal bore and outside diameter. Available black or galvanised.
| Nominal bore | Outside diameter (mm) | Wall thickness (mm) |
|---|---|---|
| 15 NB | 21.3 | 2.0 – 3.2 |
| 20 NB | 26.9 | 2.0 – 3.2 |
| 25 NB | 33.7 | 2.0 – 4.0 |
| 32 NB | 42.4 | 2.0 – 4.0 |
| 40 NB | 48.3 | 2.3 – 5.0 |
| 50 NB | 60.3 | 2.3 – 5.4 |
| 65 NB | 76.1 | 2.3 – 5.9 |
| 80 NB | 88.9 | 2.6 – 5.9 |
| 100 NB | 114.3 | 3.2 – 6.0 |
| 125 NB | 139.7 | 3.5 – 5.4 |
| 150 NB | 165.1 | 3.5 – 5.4 |
| 200 NB | 219.1 | 4.8 – 8.2 |
Additional sizes, grades, lengths and finishes available on request — contact us for a full size chart and quote.
Common Applications
- Structural columns and posts
- Handrails, balustrades and fencing
- Architectural and exposed steelwork
- Bollards and street furniture
- General fabrication and engineering
Relevant Standards
- AS/NZS 1163 — Cold-formed structural steel hollow sections
- AS 1074 — Steel tubes and tubulars for ordinary service
- AS 4100 — Steel structures
CHS Steel — Frequently Asked Questions
What CHS sizes do you supply?
Circular hollow sections from 26.9 mm to 508 mm outside diameter in wall thicknesses from 2.0 to 12.7 mm, to AS/NZS 1163 in Grade C250L0 and C350L0.
What is the difference between CHS and pipe?
CHS is a structural hollow section made to AS/NZS 1163 and specified by outside diameter and wall thickness. Pipe is made to pressure or plumbing standards and specified by nominal bore. For structural work, specify CHS.
What is CHS used for?
Columns and posts, trusses and space frames, handrails and balustrades, bollards, piles and architecturally exposed steelwork where a round profile is wanted.
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