Alukönigstahl
Contact
AKS Login
Hollow sections

Cold-Formed Hollow Sections

A closed section combines high bending and torsional stiffness with low weight, which is why it frames canopies, machine bases and load-bearing structures that need to stay slender. Our cold-formed hollow sections cover circular, square and rectangular shapes, from structural grades to EN 10219 up to high-strength S960MH, each delivered with an EN 10204 3.1 inspection certificate.

View all hollow sections
Circular
◯
Square
☐
Rectangular
▭
cold_formed_hollow_sections
01Performance & features

What a closed section brings to your structure

Forming at room temperature gives the section its consistent geometry, and the closed profile gives it stiffness. Together they shape how the material performs on the drawing board, in the workshop and in service.

Structural efficiency

The closed section transfers loads effectively at relatively low weight, so structures can be designed to be durable, lightweight and cost-effective.

Dimensional accuracy

High dimensional accuracy and consistent geometry simplify design, fabrication and installation, which can reduce adjustment work between drawing and site.

Surface quality

An excellent surface counts wherever sections stay visible in the finished structure or receive a coating before they are installed.

Reliable mechanical properties

Consistent mechanical properties give your structural calculation a dependable basis, from the first member of a structure to the last.

Broad range of grades

From S235JRH and S355J2H to high-strength S700MH, S900MH and S960MH, so the grade can follow the load case of your project.

Ready for further processing

Sections can be cut, drilled, welded and processed further. In Poland, the KÖNIGSTAHL service centre adds 3D laser processing to the route.

02Dimensions & grades

Standards, grades and dimensions

Two section families on a shared basis of standards and certificates. Choose the shape first, then specify the grade and size your design calls for.

PropertyValueStandard
Outside diameter26.9 – 508 mm-
Wall thickness2.6 – 16 mm-
Cold-formedS235JRH · S355J2H · S420MHEN 10219
High-strengthS500MH · S700MH · S900MH · S960MHEN 10149-2 / EN 10219-2
Inspection certificate3.1 to EN 10204 (3.2 on request)EN 10204
CE markingup to and including S700MH-

Not every wall thickness is available in every size and grade. Our steel team confirms the combination your order requires.

03 - Cold-formed steel hollow sections

What are cold-formed hollow sections?

Cold-formed hollow sections are made by forming steel strip into a circular, square or rectangular section at room temperature and joining the edges with a longitudinal weld. The process yields consistent dimensions, a wide range of section sizes and a favourable ratio of strength, and in particular stiffness, to weight.

Their closed geometry provides high bending and torsional stiffness, which is why they are widely specified in steel structures, machinery and industrial applications. They also leave room to optimise weight and to place material where the load needs it.

ALUKÖNIGSTAHL supplies them in a broad choice of dimensions and steel grades, from S235JRH and S355J2H to high-strength grades up to S960MH, depending on product range and delivery conditions.

Different corner geometry, different residual stresses: for heavily loaded columns and compression members, compare with hot-formed hollow sections 

Compare with hot-formed hollow sections
cold_formed_hollow_sections_under_1mb
04Applications

Where cold-formed sections carry the load

From the roof over a loading bay to the frame of a machine, hollow sections are specified wherever a structure has to be stiff, light and dimensionally reliable.

Industrial buildings, canopies and roof structures

Industrial buildings, canopies and roof structures

Machine and equipment frames

Machine and equipment frames

Transport structures and vehicle components

Transport structures and vehicle components

Stands, supports and frames

Stands, supports and frames

Structural steelwork in construction

Structural steelwork in construction

Industrial equipment and infrastructure components

Industrial equipment and infrastructure components

Which standard applies to cold-formed hollow sections?

Cold-formed structural hollow sections are generally produced to EN 10219. Choose the steel grade according to the load-bearing capacity, operating temperature and loading conditions of your project.

High-strength grades call for particular attention in welding, forming and processing, because their requirements can differ from those of standard structural steels.

Steel grades & delivery conditions

EN 10219-1

Technical delivery conditions

EN 10219-2

Tolerances, dimensions and sectional properties

EN 10204

Types of inspection documents (3.1, 3.2)

06Selection

How to select a cold-formed section

Five parameters define your order:

  1. 01

    External dimensions

  2. 02

    Wall thickness

  3. 03

    Steel grade

  4. 04

    Length

  5. 05

    Documentation requirements

For load-bearing structures, base the choice on structural design calculations that account for loads and support conditions.

Not sure which section fits your structure?

Tell us the loads, the spans and the processing your project involves. Our steel specialists compare shapes, grades and wall thicknesses with you, so you order the section your structure needs and not a size larger.

Contact a specialist