Electric Resistance Welded Steel Pipe Manufacturing technique The raw material of the same width of the ERW Steel Pipe can be processed in different molding angles to manufacture steel pipe in various diameters which are in accordance with the standards. Materials We use A25-X100 steel type to manufacture the Steel Pipe. Zhongshun is an ERW steel pipe manufacturer and supplier. We also offer black steel pipe and coating steel pipe, etc. Our hight quality products are offered at competitive prices. Zhongshun is located in China, where the full chain of manufacturing pillings and galvanized steel pipes can be completed, even in one city, which helps save our production cost. Our lower manufacturing cost saves your purchasing cost. The company now has 3 longitudinally H.F. welded pipe mills, 6 spirally double-side submerged arc welded pipe mills, and 2 anti-corrosion pipe mills.