Structural G550 High Strength Galvanized Steel Coils for Load Bearing Frames

Structural G550 High Strength Galvanized Steel Coils deliver a minimum yield strength of 550 MPa, allowing engineers to achieve the same load-carrying capacity with thinner and lighter sections. In light-gauge steel framing, purlins, trusses and mezzanine decks, this strength-to-weight advantage reduces steel consumption, lowers freight cost and simplifies handling on site. The high-strength base is combined with a hot-dip zinc coating so that structural members resist corrosion even in exposed or semi-exposed service conditions. For builders of prefabricated steel structures, these coils make it possible to roll strong profiles that stay straight, hold tolerances and remain durable over the life of the building.

• High Yield Strength: Minimum 550 MPa yield makes lighter, stronger sections possible for the same load.
• Excellent Strength-to-Weight Ratio: Lower steel mass per member reduces total project cost and handling effort.
• Corrosion Resistant Coating: Z100 to Z275 zinc layer protects structural framing in demanding service.
• Consistent Mechanical Properties: Uniform strength along the coil keeps roll-forming and pressing predictable.
• Good Formability for Its Strength: Engineered alloy and process allow profiles and holes to be formed cleanly.
• Standards Compliance: Manufactured to ASTM A653, EN 10346 and AS 1397 requirements.

G550 structural coils are used to roll and press load-bearing elements for light-gauge steel frame housing, purlins and girts, roof and floor trusses, mezzanine floor decks, racking systems, steel scaffolding, solar mounting structures and agricultural building frames. Their high strength allows economical C, Z and Sigma profiles to span longer distances, which helps fabricators and builders cut material use without compromising safety margins. Because the members are galvanized, they can be installed in unheated, humid or semi-outdoor environments with minimal additional protection.

The coils are wound on 508 mm or 610 mm inner diameters, protected with waterproof paper, an inner sleeve and PVC edge protectors, steel-strapped and palletized or container-loaded to resist movement. Surface passivation and oiling protect against white rust between production and installation. Yield strength, tensile strength, elongation, coating mass and dimensions are verified in-house before dispatch, and a Mill Test Certificate is issued for each batch so structural engineers can file the material traceability they require. Custom widths and trial coils are available for profile development.