Steel Sigma Profile
Roll-formed to order from black (uncoated) steel S500, for indoor structures or members that are painted or galvanized after fabrication. Minimum order 5 t per size.
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Applications & Selection Guide
Sigma profiles are roll-formed lipped sections with an indented web, from 160 to 400 mm in 1.5–4 mm. The indent stiffens the web; its width (A), bend (B) and depth (C) are listed with the section properties on every size page.
Typical uses: solar tracker and fixed-tilt structures, purlins, racking uprights and light steel buildings.
Materials: black steel S235, S355, S420, S450 and S500; pre-galvanized S350GD+Z275, S420GD+Z275 and Aluzinc; and Magnelis S350GD, S420GD and S450GD with ZM310 or ZM350 coating. Profiles are rolled on continuous roll-forming lines in lengths up to 25 m, with holes punched to your drawing. The minimum order is 5 t per size and material. Production holds an EN 1090-1 factory production control certificate (CE marking, structural components up to execution class EXC2 to EN 1090-2) and ISO 9001, ISO 14001 and ISO 45001 certification.
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 →Product Information
Material Grade
S235–S500 black steel; S350GD+Z275, S420GD+Z275 and Aluzinc pre-galvanized; S350GD–S450GD Magnelis ZM310/ZM350
Manufacturing Standard
EN 1090-1 (CE, EXC2); coated strip to EN 10346
Material Type
Steel
Category
Sigma Profile
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