What is the difference between hot-finished and cold-formed CHS?

Hot-finished tube to BS EN 10210 is formed at high temperature, leaving low residual stress, sharper corner properties in the rectangular equivalents and better low-temperature toughness. Cold-formed tube to BS EN 10219 is made at ambient temperature and is generally more economical. If your specification names one standard, it should be supplied to that standard.

How are circular hollow sections connected?

Usually by profiled (coped) welded joints where tube meets tube, or by welded flange plates that then bolt together. Cutting the saddle profile accurately is a fabrication-shop job — we cope and weld tubular connections in-house under BS EN 1090 EXC 3.

What grades of circular hollow section do you stock?

Standard supply is S275 and S355 to BS EN 10025, fully mill-certified with heat numbers traceable to the rolling mill. Other grades — including weathering and stainless — are available to order on request.

Can I order circular hollow section cut to length, drilled and notched?

Yes. Every CHS section is cut to your specified length and we can drill, notch, end-plate, weld and shot-blast / paint to your engineer's detail before delivery — all in-house under BS EN 1090 EXC 3.

How quickly can circular hollow section be delivered?

Stock CHS sections typically dispatch within 3–5 working days of order acceptance. Fabricated packages run to a confirmed production schedule agreed at order, with weekly progress reporting and HIAB offload worldwide.

Do you supply mill certificates with circular hollow section?

Yes. EN 10204 3.1 mill certificates are issued with every CHS order, fabricated work ships with the CE Declaration of Performance and full weld records, and trade buyers can have certification consolidated per project.

Can I buy circular hollow section without a trade account?

Yes. Homeowners, self-builders, architects and contractors can request a quote with no minimum order. Trade accounts are available for repeat buyers wanting consolidated billing and credit terms.

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BS EN 1090 / EXC 3

49 circular hollow section sections

Circular Hollow Section
(CHS)

Circular hollow sections (CHS) for columns, bracing, handrails and architectural tubular steelwork.

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CRsteelStructural steel fabrication & supply

BS EN 1090: Certified to BS EN 1090-1:2009+A1:2011 Execution Class 3 as per BS EN 1090-2:2018
30+ Years: Years supplying the industry with trusted structural steel fabrication and installation excellence
Workforce: Welding Quality Management System (WQMS) accredited by ISOQAR, approved to BS EN 1090 EXC 3.
Worldwide: Site erection coverage worldwide with full project management support

49 circular hollow section sections/BS EN 1090 — Certified to BS EN 1090-1:2009+A1:2011 Execution Class 3 as per BS EN 1090-2:2018/30+ Years — Years supplying the industry with trusted structural steel fabrication and installation excellence/Workforce — Welding Quality Management System (WQMS) accredited by ISOQAR/Worldwide — Site erection coverage worldwide with full project management support/

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Circular Hollow Section

Circular hollow sections are structural tube. With material distributed evenly around the perimeter there is no weak axis, so a CHS is efficient in compression from any direction and outstanding in torsion — which is why architects specify it wherever the steel is left on show.

Sizes are quoted as outside diameter × wall thickness, for example 168.3 × 8.0. Two grades of manufacture exist: hot-finished to BS EN 10210 and cold-formed to BS EN 10219, and the difference matters for tight bends and for toughness at low temperature.

StructuralSteel.ai holds 49 CHS sizes, cut to length, drilled and CE marked under BS EN 1090 EXC 3, with EN 10204 3.1 mill certificates on every order. Typically specified for bollards and street furniture, canopy supports, bracing in exposed frames, roller and shaft sleeves and exposed architectural columns.

Before you order

Outside diameter and wall thickness — not an equivalent 'size'
Hot-finished or cold-formed, if the specification calls one out
End treatment: plain cut, coped, or flange-plated
Whether the tube needs to be sealed against internal corrosion

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All circular hollow section (CHS) sizes

49 sections

Related categories

Other structural steel sections

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Fabrication, finishing and delivery

Cut to length, drilled and notched — Metal Fabrication
BS EN 9606-1 coded welding
CAD detailing and connection design
CE marked under BS EN 1090 EXC 3
worldwide delivery with HIAB offload
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FAQs

Circular Hollow Section (CHS),
answered.

Buying circular hollow section (CHS) — sizes, grades, cutting, fabrication and worldwide delivery from StructuralSteel.ai.

Hot-finished tube to BS EN 10210 is formed at high temperature, leaving low residual stress, sharper corner properties in the rectangular equivalents and better low-temperature toughness. Cold-formed tube to BS EN 10219 is made at ambient temperature and is generally more economical. If your specification names one standard, it should be supplied to that standard.

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