Galvanized Steel Coil for Containers | Durable & Corrosion-Resistant

Galvanized steel coils for container manufacturing must meet strict standards for formability, corrosion resistance, and impact toughness. Containers endure harsh conditions—saltwater exposure during shipping, temperature fluctuations, and mechanical stresses—requiring Z275 or higher zinc coatings (often Z350) for longevity . The steel must also exhibit low yield strength (typically <300 MPa) to allow deep drawing for corner posts and corrugated side panels without cracking. ASTM A653 Grade 80 is commonly used, combining a minimum tensile strength of 550 MPa with elongation >18% to ensure ductility . Key fabrication steps include roll forming for side walls, spot welding for panel connections, and edge deburring to prevent coating damage. Corrosion protection is enhanced by additional paint systems over the galvanized layer, especially in the interior for food grade containers. Container manufacturers also specify flatness tolerances (<3mm/m) to ensure proper stacking and sealing. Recent trends include using galvalume (Zn Al) coatings for better heat reflectivity in refrigerated containers and lightweight high strength steels to increase payload capacity without compromising durability.