... & TubesSr. No.MaterialSizeSch. & Standard wire gaugeSpecification1.Seamless Pipe15 mm NB To300 mm NBSch. 5s, 10s, 40s, 80s, 160s, XXSA-3122. ... Welded (ERW) Pipe15 mm NB To300 mm NBSch. 5s, 10,40s & 80sA-3123.Welded (ERW) ... , 202 Etc.Special Tube & PipesPrecision Tubes, Capillary Tube, Fabricated Pipe(with radiography)In Form ofRound, Square, Rectangle, Oval, Coil, Flexible ...