Authentic Steel supplies medium and heavy gauge GI coils from 0.4mm to 3.0mm designed for structural framing, heavy ductwork, and machinery enclosures. Our structural galvanized steel sheet coils feature high mechanical strength and corrosion resistance.
Heavy structural engineering and commercial building applications demand materials with exceptional load-bearing capability and unyielding zinc layer integrity. Authentic Steel’s medium and heavy gauge GI coils (0.4mm to 3.0mm) are purpose-built to meet the stringent technical requirements of modern industrial construction, infrastructure projects, and heavy machinery enclosures.
By maintaining strict control over base metal composition and thermal profile during hot-dip immersion, our structural galvanized steel sheet coils achieve outstanding yield strengths without compromising formability during continuous cold profiling. Primary structural applications include heavy C/Z purlins, steel floor decking panels, highway safety guardrails, industrial HVAC ducting networks, and structural framing studs.
| Parameter | Specification |
| Thickness | 0.4mm - 3.0mm |
| Width | 870mm - 1250mm |
| Zinc Coating | 60g/m² - 350g/m² |
| Coil Weight | 5 - 15 MT |
| Coil Inner Diameter | 508mm / 610mm |
| Structural Grades | S280GD, S350GD, S550GD, DX52D |
| Surface Treatment | Chromated, Oiled, Anti-Fingerprint |
Working with thicker steel plates introduces mechanical challenges regarding surface flatness, residual stress release, and springback during cold bending. Authentic Steel employs advanced skin-pass rolling and inline tension leveling to ensure superior flat coil geometry, preventing distortion or alignment issues during automated cutting, punching, and welding operations. Furthermore, thicker steel demands consistent zinc coverage to guarantee long-term rust prevention across high-stress structural joints. Our production line ensures precise coating weights verified via automated X-ray gauge monitoring across both sides of the steel sheet.
To prevent white rust formation during long-distance maritime transit, we offer chromated, light oiled, or anti-fingerprint surface passivations. Our factory fully supports customized mechanical specifications, allowing engineering buyers to select structural grades from S280GD up to S550GD. Each production run comes complete with full mill test certificates outlining chemical composition, tensile strength, yield point, and elongation percentages. Supported by our strategic proximity to Tianjin Port, Authentic Steel handles bulk export logistics efficiently and securely. Our specialized export packaging utilizes heavy iron inner and outer protective rings to prevent edge deformation during crane handling. Contact our engineering sales division today for direct mill quotes and comprehensive material testing certificates.
Contact Information
Email: bella@authsteel.com / bella@wanlusteel.com
Mobile/Tel/WhatsApp: +86 189 2041 0870
