ISO/API carbon steel pipe/steel tube 1.Type: smls welded ... : ASTM, DIN,JIS 4.Size:1/2"-48" ISO/API carbon steel pipe/steel tube1.Type: smls welded2.Material: a106b ... 420, 430 etc. Carbon Steel: ASTM A 106, A 53, API A 5L Gr A, B, C, ASTM A 333, Gr ... the standard quality butt-welding elbow, tee, reducer, nipple, bushing, coupling, outlet etc supplying.AS CS SS Pipe, fittings, flangesMaterial: Carbon ...