Welded Steel hollow sectionsRectangular tubeProduction standard: ASTM A500 ,ASTM A 53 ,EN 10210 ,EN 10219 ,JIS G 3466 ,BS 1387, BS 6323 IS : 3074IS : 4923, DIN 1626, DIN 2394.Steel grade: DIN 17100(EN 10025), ST33, ST37,ASTM A500, ASTM A 53: Gr. A, Gr B, Gr C, Q195, Q215, Q235, Q275, Q295, Q345,...