welded pipe 1.Standard: BS, GB, ASTM,DIN,JIS 2.OD:25-356mm 3.Thickness: 2 - 40 mm 4.Technique:Cold Drawn welded pipe 1. product name welded pipe2. StandardBS, GB, ASTM,DIN,JIS3. Thickness2 - 40 mm 4. TechniqueCold Drawn5. CertificationAPI welded pipe