English
A C-shaped steel purlin is a type of structural steel beam that has a C-shaped cross-section. It's a horizontal support member used in the construction of buildings, primarily to support the roof and walls. These purlins are part of the secondary framing system and are typically used in pre-engineered metal buildings, warehouses, and carports. They are made from high-tensile, galvanized steel, which gives them excellent strength and corrosion resistance.
A C-Shaped Steel Purlin (or C-purlin) is a cold-formed steel member used as a secondary structural component in building construction. Its primary function is to support the roof deck or wall sheeting and transfer the loads to the primary structural frame (like rafters, trusses, or beams).
The "C" shape refers to its distinctive cross-section, which resembles a squared-off letter "C". They are manufactured by roll-forming flat sheets of high-strength galvanized or coated steel into their final shape.
Cross-section height (H): 80mm to 300mm (commonly used: 100mm to 250mm)
Flange width (B): 40mm to 80mm
Edge flange (R): 10mm to 20mm
Plate thickness (t): 1.5mm to 3.0mm (cold-formed)
Length (L): 4m to 12m (Customizable)
Material: Q235B, Q355B, G550 (high-strength galvanized steel)
Surface treatment: Black material, galvanized (Z120 to Z275), spray-coated corrosion protection
Simple shape: The cross-section is shaped like the English letter “C,” with a symmetrical structure that facilitates installation.
Easy to process: Can be continuously rolled using a cold-forming machine, with lengths cut according to design specifications.
Moderate strength: Suitable for structures with medium to small spans, providing stable load-bearing capacity.
Simple connection: Easy to connect with roof panels, wall panels, and main structures.
Roof and wall purlins for light steel structure factories
Auxiliary components such as door and window frames, beams, and brackets
Can be used for roof truss systems in carports, warehouses, and small buildings.
For roofs with a small slope and medium span: C-shaped steel purlins are recommended.
For roofs with a large slope or requiring overlapping construction: Z-shaped steel purlins are recommended.
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