Steel Tube Standard: GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601,3602,6323, DIN1629,1630, ... extruded tube seamless by standard GB/T3639,8162,3087,ASTM A106,A192, BS3059,3601,3602,6323, DIN1629,1630, JIS ... G34541.Standard:GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601,3602,6323,DIN1629,1630,JIS G34542 ... 1026,1033,1037,1043,1046,1053,1060,1566,1572By DIN: St12,13,14,Ck10,Ck15,Ck22,Ck25,Ck30, ...