Steel Tube Standard: GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601, ... professional of supplying carbon structure steel cold draw and extruded tube seamless by standard GB/T3639,8162,3087,ASTM A106,A192 ... ,1033,1037,1043,1046,1053,1060,1566,1572By DIN: St12,13,14,Ck10,Ck15,Ck22,Ck25,Ck30,Ck35,Ck40,Ck45,Ck50 ... -400mm Wall thickness 0.5-40mm4.Packing: exporting packing Steel Tube