Channel sections, with or without flange stiffeners, are usually referenced as C shapes; Channel sections without flange stiffeners are also referenced as U shapes; Point symmetric sections that are shaped similar to the letter Z are referenced as Z shapes.
Section designations can be regional and even specific to a manufacturer. In steel building construction, secondary members such as purlins (roof) and grits (wall) are frequently C, Z or U sections, (or mill rolled) C sections.
Cold formed members can be efficient on a weight basis relative to mill rolled sections for secondary member applications. Additionally, Z sections can be nested for transportation bundling and, on the building, lapped at the supports to develop a structurally efficient continuous beam across multiple supports.
We have these specifications and we can also serve according to our customers requirements. Z & C Purlin Specification: ASTM A653. Galvanized Steel Coil: Grade 50, SS340, Minimum YS 340 MPA, TS 450 MPA, Regular/Zero Spangle. Thickness: 1.2 mm to 3.0 mm Origin: South Korea, India, Japan,
Product Specification
ASTM A 653 SS Gr. 50 ( With Min YS >= 340 Mpa)
The purlins are in turn supported by rafters or walls. Purlins are most commonly used in Metal Building Systems, where Z-shapes are utilized in a manner that allows flexural continuity between spans.
