ERW (Electric Resistance Welded) Galvanized Steel Tube for construction is a durable, cost-effective piping solution manufactured by high-frequency welding carbon steel strips and applying a zinc coating through hot-dip galvanization. This process ensures strong weld seams and excellent corrosion resistance, making it ideal for structural frameworks, scaffolding, fencing, and water supply systems in buildings. The tubes typically comply with ASTM A53 or EN 10255 standards, featuring outer diameters from 21.3mm to 219mm and wall thicknesses of 1.8mm-6mm. With a zinc layer of 40-275g/m², they offer 3-5 times longer service life than black steel pipes in humid or outdoor environments.