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Profile solution for mounting and support systems.
C-shaped steel comes in various specifications, with common models ranging from C50 to C280. The section height, width, thickness, and flange size can be selected according to usage and load requirements.
Common Specifications and Dimensions
C-shaped steel is usually named according to section height. Common specifications include:
C80: Section height 80mm, typical size such as C80×40×20×2.5 (height × width × flange × thickness), theoretical weight about 3.925 kg/m, suitable for light roof purlins and wall beams.
C100: Section height 100mm, e.g., C100×50×20×3, weight about 5.652 kg/m, suitable for medium-sized industrial building purlins.
C140-C200: Section height 140-200mm, mostly used in medium-sized industrial buildings and platform structures, with stronger bearing capacity.
C220 and above: Suitable for heavy-load structures, large equipment supports, and photovoltaic supports.
C280: Section height 280mm, weight can reach 11.304 kg/m, suitable for projects requiring high load capacity and weather resistance.
Section Parameters
C-shaped steel consists of a web, flanges, and flanges edges, with main parameters including:
Web height (h): Determines load-bearing capacity
Flange width (b): Increases rigidity
Flange edge width (c): Enhances stability
Thickness (t): Affects strength and weight
For example, C80×40×15×2.5 has a section height of 80mm, width 40mm, flange edge 15mm, thickness 2.5mm, weight about 4.71 kg/m.
Material and Surface Treatment
Material: Commonly used steels are Q195, Q235, Q345, with high strength up to G350–G450 MPa.
Surface treatment:
Standard type (black steel): Suitable for dry indoor environments
Hot-dip galvanized type: Corrosion-resistant, suitable for outdoor or humid environments
Spray-coated/painted type: Combines corrosion resistance and aesthetics
Usage Classification
Construction: Roof purlins, wall beams, platform structures
Mechanical: Equipment frames, small-section models such as C40, C50
Racking: Storage racks, flange design enhances load-bearing
C-section steel is a highly efficient and economical cold-formed steel section. Named for its "C"-shaped cross-section, it is mainly used as purlins and wall beams in steel structure buildings.
Core Advantages
Its main advantages are light weight and high strength. Under the same load-bearing conditions, C-section steel can save approximately 30% of material compared to traditional channel steel. This is achieved by cold-rolling hot-rolled or galvanized steel sheets (commonly Q235 or Q345 grades) at room temperature, which preserves the material's strength and ensures uniform wall thickness.
