Hollow sections


For efficient manufacturing & unlimited freedom of design

Structural hollow sections

SSAB produces cold-formed and welded structural hollow sections for multiple purposes, ranging from versatile SSAB Domex Tubes to ultra-high-strength Strenx Tubes. Whether you are building lifting or moving equipment or designing buildings, you can find a suitable product to best fit your needs. With SSAB's structural hollow sections, you can significantly reduce the weight of your steel structures while gaining savings in material and manufacturing costs – without limiting the freedom of design. You can also choose from several shapes of hollow tube, including square hollow sections and rectangular hollow sections.

Strenx Tubes are the most advanced high-strength hollow tube sections in the market. They will help you reach higher, carry bigger loads, reach longer spans or improve your products in many other ways.

SSAB Domex Tubes provide an unbeatable combination of higher load capacity, wide dimensional range and tailoring possibilities. SSAB Domex Tube Double Grade is especially designed for construction purposes, combining steel grades S420MH and S355J2H.

SSAB Weathering Tube family makes it possible to achieve advanced engineering and construction under tough atmospheric conditions. Use of SSAB Weathering Tubes minimizes the need for maintenance and corrosion prevention treatments.

SSAB produces cold formed* and welded structural hollow sections for multiple purposes
Strenx tubes

Strenx Tubes

Strenx is the most advanced high-strength structural steel in the world. The naturally stiff tubular shapes help you get the most out of the strength. Strenx Tubes are available with steel grades S700 up to S960.

Typical applications for Strenx Tubes are lifting equipment, material handling, frame structures, lattice structures as well as trusses and columns. They are easily weldable and available in various shapes and sizes, including customer-specific shapes, including square hollow sections and rectangular hollow sections.

SSAB Domex Tubes

SSAB Domex Tubes is a product family of versatile, high strength hollow section steel with numerous tailoring possibilities and benefits. They fulfill or exceed the requirements of EN 10219 and are available with steel grades S235 to S550.

SSAB Domex Tube Double Grade hollow sections are especially designed for steel construction according to EC3 and EN 1090. They have an improved buckling curve, thickness tolerance and impact toughness guarantee.

With SSAB Domex Tubes you can benefit from the low alloying, dimensional accuracy and batch-to-batch consistency to get savings on design desk and on the workshop floor.
Domex tubes
Lighter and more cost efficient trusses with hybrid design

Lighter and more cost efficient trusses with hybrid design

SSAB has a unique offering of standard and high strength hollow section steel suitable to be used in steel construction, especially in trusses. Traditionally only mild steels - S355 and even lower - have been used in construction, but SSAB has shown that cost and weight savings can be achieved in trusses with high strength steels, especially by using hybrid design.
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Lighter and more cost efficient trusses with hybrid design

In trusses most of the weight is in chord members, so using high strength steels in chords is crucial for weight and cost savings. On the other hand, the brace members bring in lot less of the total mass, while fabricating them creates most of the fabrication costs. So it pays off to use milder steel grades in braces so the welding can be done according to milder steel grade. This has been proven as the most cost efficient truss design in various analyses, especially with long span trusses. Using hybrid design is especially easy with SSAB Domex Double Grade hollow sections, as it comes with two test certificates, one for S355J2H and second for S420MH, so the designer can choose the best alternative for each particular case.

Selecting the right material for the chords (and braces) is case sensitive, but in many cases using Strenx Tube 700 has proven to be the best choice. SSAB has a CE marking to all its hollow sections up to Strenx Tube 700, also welding to cold formed corners is allowed. For more information see the design guide and our design guides.

High resistance columns from SSAB’s hollow steel sections

SSAB manufactures cold formed and welded hollow steel sections, which according to EN 1993 (Eurocode 3) fall into buckling curve c (curve a or b in concrete filled columns). The buckling behavior of steel columns leads to situations where utilizing high strength steels is difficult especially with longer and slender columns. In these cases the geometry dictates the performance. 

However, the SSAB Domex Double Grade hollow sections have been tested for their compressive strength and have been granted buckling curve b. The higher strength of the tube gives benefits with shorter columns and improved buckling curve with longer ones. The combination creates a very high resistance and cost efficient column.

For even more stressed columns SSAB can offer hollow sections up to steel grade S700MH (Strenx Tube 700) with wide dimensional range.