1) Standard:ASTM,DIN,JIS,EN,GB/T. 2) Thickness: 0.25 to 3.0mm. 3) OD: 6.0 to 219mm. 4)Surface:2B,satin ... our round welded tube:1.Certification:ISO9001:2000,M.T.C2.Standard: JIS, GB, DIN, ASTM, EN.3.Materials: AISI 201, 202, 301, 304 ... 6.0mm to 219mm. Thickness is from 0.25mm to 3.0mm. Other specifications are welcomed to consult.5.Finishing: annealed ...