Welded Steel Pipe ERW welding round pipes also are called as Electric Resistance Welded Pipes.This type of welded steel pipes and tubes are widely used in various fields such as engineering purposes, fencing, scaffolding, line pipes etc. ERW welded steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. Electric Resistance Welded (ERW) pipe is manufactured by cold forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The two edges are then simultaneously heated with a high frequency current and squeezed together to form a bond. The longitudinal ERW seam does not require filler metal. Standard: BS 1387-1985, ASTM A53, ASTM A513, ASTM A252-98, JIS G3444-2004 STK400/500 G3452-2004, EN 10219, EN 10255-1996, DIN 2440, GB/T13793-2008 Material: Q195, Q235, Q275, Q345 Specification: 1/2”-16” (OD: 21.3mm-660mm) Wall thickness: 1.0mm-12mm Surface treatment: Galvanized, oil coating, lacquering