GI Corrugated Duct Pipe 40MM, 50MM, 60MM, 70MM, 80MM, 90MM, 100MM

GI (Galvanized Iron) Corrugated Duct Pipes, available in sizes like 40MM, 50MM, 60MM, 70MM, 80MM, 90MM, and 100MM diameters, are primarily used as sheathing for post-tensioning tendons in concrete structures like bridges and flyovers. Made from galvanized steel with a corrugated profile, these thin-walled, round ducts are corrosion-resistant and durable, providing a void for the steel cables (tendons) before grouting. Typical wall thicknesses range from 0.3mm to 0.5mm, and standard lengths are often 3 to 6 meters, ensuring a strong bond with the surrounding concrete and protecting the prestressing elements.