Profile Section
310x90x4mm Steel Sigma Plus Profile, Mill Finish
The 310x90x4mm steel Sigma Plus profile combines an indented web with double edge lips: 310 mm web, 90 mm flanges and 4 mm thickness, 17.32 kg/m. Roll-formed to order in Aluzinc steel, it is used for heavy purlins, columns and long-span members. This page shows the size in Aluzinc: steel strip with an aluminium–zinc alloy coating. The steel grade is confirmed in the quotation.
Made to Order — Roll Formed
This profile is roll-formed to order in your length (1–25 m). The minimum order is 5000 kg per size and material. Add your sizes to a quote request and we confirm lead time and price.
Add to Quote Request
Select length and quantity to add to your quote cart
Minimum order: 25 pieces
Minimum order: 5,000 kg per size
Optional made-to-order requirements — added to this line for our production team.
Applications & Usage
Sigma+ 310x90x4 is used for heavy purlins, columns and long-span rafters on industrial and agricultural buildings. Aluzinc is chosen for roof and cladding substructures and other outdoor members where an aluminium–zinc coating is specified. Each size is roll-formed to order in lengths from 1 to 25 m. The minimum order is 5000 kg per size and material — add your sizes to a quote request and we confirm lead time and delivered price.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 310mm × 90mm × 4mm |
| Weight per Meter | 17.32 kg/m |
| Weight of a 6 m length | 103.9 kg |
| Weight of a 12 m length | 207.8 kg |
| Material | Steel |
| Alloy/Grade | Aluzinc (Al-Zn) |
| Standard | EN 1090-1 (CE, EXC2); coated strip to EN 10346 |
| Profile Type | Sigma Plus (Σ+) |
| Edge Lip (c) | 25 + 15 mm |
| Web Indent (A / B / C) | A 55 / 60 · B 15 · C 25 mm |
| Developed Width | 550 mm |
| Cross-Section Area | 22.06 cm² |
| Moment of Inertia Iₓ | 3096.4 cm⁴ |
| Section Modulus Wₑₗ,ₓ | 199.77 cm³ |
| Radius of Gyration rₓ | 11.71 cm |
| Moment of Inertia Iᵧ | 172.7 cm⁴ |
| Section Modulus Wₑₗ,ᵧ | 30.55 cm³ |
| Radius of Gyration rᵧ | 2.77 cm |
| Centroid Distance eₓ | 3.35 cm |
| Available Lengths | 6m, 12m |
| Standard Length | 6 m |
| Minimum Order per Size | 5 t |
| Cut-to-Length Range | 1000 – 25000 mm |
Weight and section properties are nominal values from the mill catalogue table. Values marked ≈ are calculated from the section centerline.
Load guidance is shown only for materials with a stated steel grade; for Aluzinc (Al-Zn) the grade is confirmed in the quotation.
Made to Order — Roll Formed
This profile is roll-formed to order in your length (1–25 m). The minimum order is 5000 kg per size and material. Add your sizes to a quote request and we confirm lead time and price.
Cut to exact length
Any length from 1 to 25 m — no offcut waste on site
Material options
Aluzinc: steel strip with an aluminium–zinc alloy coating applied on the coil.
In-line punching
Holes and slots punched to your drawing
Certified production
EN 1090-1 factory production control (CE, up to EXC2); ISO 9001
Similar Sizes
Explore alternative dimensions that might suit your needs
Technical guides
S350GD, S420GD and DX51D+Z: coated steel grades to EN 10346 explained
What S350GD+Z275, S420GD+ZM310 and DX51D+Z mean: minimum yield and tensile strength of EN 10346 structural and forming grades, coating types and masses, and which grades we roll purlins from.
Read the guide →C, Z or Sigma purlins: how to choose the right cold-formed section
How C, C Plus, Z, Sigma and U cold roll-formed sections differ, where each is typically used, the size ranges available, and what to send for a quote.
Read the guide →Purlin coatings: black steel, galvanized Z275, Magnelis (ZM) or Aluzinc?
How the four material options for cold roll-formed purlins compare — grades, coating mass, cut-edge behaviour and typical exposure — and how to specify them.
Read the guide →Purlin sizes and weights: C, Z and Sigma section tables
Complete size tables for cold roll-formed C, C Plus, Z, Sigma, Sigma Plus and U sections: dimensions, weight per metre, area, Ix and Wx from the mill catalogue.
Read the guide →Steel coatings
Galvanized purlins: pre-galvanized Z275 C, Z and Sigma sections
Cold roll-formed C, Z, Sigma and U sections from pre-galvanized S350GD+Z275 and S420GD+Z275 strip: size ranges, lengths up to 25 m, punched holes and how to order.
View coating →Magnelis (ZM) purlins: zinc–aluminium–magnesium coated C, Z and Sigma sections
Cold roll-formed purlins and girts from ZM310 and ZM350 coated strip in S350GD, S420GD and S450GD — for agricultural, coastal and other aggressive environments.
View coating →Aluzinc purlins: aluminium–zinc coated C, Z and Sigma sections
Cold roll-formed C, Z, Sigma and U sections from Aluzinc (AZ) aluminium–zinc coated strip: where it fits, size ranges, lengths up to 25 m and how to order.
View coating →