ERW (Electrical Resistance Welding) pipes are manufactured usually by cold forming of steel coil into a round cylindrical shape. ERW pipes are used in various applications like fencing, line pipe, scaffolding etc. ERW steel pipes are available in various diameters, wall thickness, finish and grades.ERW Pipes for water & sewage conforming to IS: 3589 & water well casing conforming to IS: 4270. ERW (Electrical Resistance Welding) pipes length can vary from 12m, 30m, 3m, and 6m. ERW pipes 1/2, 3/4, 1, 2.