There is a galvanized iron ERW pipe offered by us features a protective zinc coating that helps prevent corrosion, rust, and the buildup of mineral deposits, thereby extending the pipes lifespan. Galvanized steel pipe is most commonly used in plumbing and other water-supply applications. It is most commonly used for outdoor construction like fences and handrails, or for some interior plumbing. Electric resistance welded (ERW) pipe is made from steel coil and the weld seam runs parallel to the pipe. The galvanized iron ERW pipe is made for industrial purposes.