Cold-formed C-channels with parallel flanges represent the modern evolution of traditional steel channel sections, offering tighter dimensional tolerances, lighter weight and a smooth surface finish that make them the preferred choice for precision-engineered steelwork and secondary construction. ULAMEX supplies UPE-type cold-formed C-channels manufactured from structural steel grades S235JR and S355J2 in accordance with EN 10219. Unlike conventional hot-rolled UPN channels with tapered flanges, our cold-formed channels feature perfectly parallel inner and outer flange surfaces, enabling simplified bolt connections, flush mounting and reduced fabrication time. Available in standard lengths of 6,000 mm from stock, these carbon steel channels provide an optimised solution for lightweight structural framing, cladding support systems and industrial applications across Europe.
Material Grades and Standards for Cold-Formed Steel Channels
Our cold-formed C-channels are manufactured from non-alloy structural steel in compliance with EN 10025-2 for material properties and EN 10219 for cold-formed welded structural hollow sections and profiles. Two principal grades are stocked:
- S235JR (material number 1.0038, formerly St37-2, equivalent to ASTM A36) — the standard mild steel grade for general construction and fabrication. Minimum yield strength of 235 MPa at thicknesses up to 16 mm, tensile strength 360–510 MPa, and minimum elongation of 26%. The JR impact designation guarantees 27 J at +20°C. S235JR is the default choice for secondary steelwork, purlin systems and light framing where high structural loads are not the governing design criterion.
- S355J2 (material number 1.0577, formerly St52-3, comparable to ASTM A572 Grade 50) — a higher-strength grade with minimum yield strength of 355 MPa, tensile strength 470–630 MPa and minimum elongation of 22%. The J2 designation ensures impact toughness of 27 J at -20°C, making S355J2 steel the preferred selection for primary load-bearing elements, crane support structures and applications in cold-climate environments.
Both grades offer excellent weldability with all standard arc welding processes and comply with CE marking requirements under the Construction Products Regulation. The controlled carbon equivalent (CEV) values ensure reliable welding performance in compliance with EN 1011-2.
Dimensions, Sizes and Specifications of Cold-Formed C-Channels
Cold-formed C-channels in UPE designation are characterised by their parallel flanges — a key distinction from traditional hot-rolled UPN channels. The parallel-flange geometry provides several practical advantages:
- Flat inner flange surfaces allow direct bolt-bearing connections without the need for tapered washers
- Consistent wall thickness along the entire flange width ensures predictable stress distribution
- Improved compatibility with modern connection systems, clamping devices and sliding mechanisms
Our cold-formed UPE channels are available in a range of heights and wall thicknesses to suit both light-duty and medium-duty structural applications. Typical height range spans from UPE 80 to UPE 400, with flange widths and web thicknesses optimised for each section size. Weight per meter is typically 15–25% lower than equivalent hot-rolled UPN channels due to the thinner, more uniform wall sections achievable through the cold-forming process. Standard length is 6,000 mm. The surface finish is smooth cold-formed, free from the mill scale typically found on hot-rolled products, which reduces surface preparation time prior to coating or painting.
Applications of Cold-Formed Steel C-Channels
The combination of parallel flanges, tight tolerances and favourable strength-to-weight ratio makes cold-formed C-channels the profile of choice for a diverse range of structural and industrial applications:
- Industrial building construction — Cold-formed channels serve as purlins and girts in portal-frame buildings, providing lateral support to roof and wall cladding. Their lighter weight compared to hot-rolled UPN profiles allows longer purlin spans without increasing substructure costs. When used as secondary framing members, they reduce overall building weight, which in turn reduces foundation loads.
- Facade and cladding substructures — The smooth, parallel-flanged cross-section of UPE channels makes them ideal as mounting rails for facade panels, curtain wall brackets and cladding support grids. The consistent geometry simplifies alignment and ensures flush mounting of facing materials.
- Solar and photovoltaic mounting systems — Cold-formed C-channels are extensively used as horizontal rails and vertical posts in ground-mounted solar panel substructures. Their favourable strength-to-weight ratio enables large-span mounting systems that minimise foundation points while supporting the required wind and snow loads.
- Mezzanine and platform construction — Lightweight mezzanine floors in warehouses, logistics centres and retail environments frequently utilise cold-formed channels as floor joists and edge beams, offering significant weight savings compared to hot-rolled alternatives.
- Mechanical engineering and conveyor systems — The precise parallel flanges serve as guide rails for sliding systems, roller conveyors and linear motion mechanisms. The smooth surface finish reduces friction and wear in moving applications.
- Agricultural buildings and storage structures — Farm buildings, grain storage facilities and livestock shelters commonly employ cold-formed channel purlins due to their corrosion resistance when galvanised and their efficient structural performance.
- Rack and shelving systems — Industrial racking, cantilever storage systems and heavy-duty shelving frameworks utilise cold-formed channels as upright columns and horizontal beams.
Technical Properties of Cold-Formed C-Channels
The cold-forming manufacturing process imparts distinctive technical characteristics that differentiate these profiles from their hot-rolled counterparts:
- Weldability — Both S235JR and S355J2 cold-formed channels are fully weldable using MIG/MAG, TIG, MMA and submerged arc processes. The thinner wall sections typical of cold-formed profiles require appropriate welding parameters to avoid burn-through, particularly at thicknesses below 4 mm. Fillet and butt welds perform reliably when executed per EN 1011-2 guidelines.
- Dimensional accuracy — Cold forming achieves significantly tighter tolerances on flange parallelism, web straightness and cross-sectional dimensions compared to hot rolling. This precision reduces fit-up time during assembly and improves the consistency of bolted connections.
- Surface treatment — The smooth, scale-free surface of cold-formed channels is ideally suited for direct painting, powder coating or hot-dip galvanising per EN ISO 1461. Surface preparation to Sa 2½ per ISO 8501-1 is more efficiently achieved on cold-formed surfaces compared to mill-scale-covered hot-rolled products.
- Forming properties — Cold-formed channels can be further processed by bending, punching, drilling and notching using standard workshop equipment. The work hardening at the bend corners increases local hardness and strength by approximately 10–15% compared to the flat portions of the profile.
Quality Assurance and Certification
As an EN 1090 certified steel distributor, ULAMEX ensures that all cold-formed C-channels meet the stringent requirements of European construction product regulations. Our ISO 3834-2 certified quality management system covers the complete chain from supplier qualification through incoming inspection, storage, handling and dispatch. Full material traceability to the production mill and heat number is maintained for every profile. Mill test certificates 3.1 per EN 10204 are provided on request — please indicate this requirement at the time of order placement. CE marking documentation accompanies each delivery.
Ordering Cold-Formed Channels — Stock and Delivery
ULAMEX maintains stock of the most popular cold-formed UPE channel sizes in both S235JR and S355J2 grades, ready for immediate dispatch across Western and Central Europe. Standard length is 6,000 mm, with sawing to custom lengths available on request. Typical delivery times are 3–5 working days for stock items. For project volumes, we offer direct mill supply with tailored scheduling and wholesale pricing.
For hot-rolled C-channels with tapered flanges and heavier cross-sections, explore our hot-rolled UPN channels. To compare parallel-flange and tapered-flange options for your specific application, or to discuss quantities and delivery scheduling, request a quote from our structural steel team. As your dedicated steel channel supplier, ULAMEX delivers reliable quality, full documentation and competitive steel wholesale conditions on every order.