Steel Tube Standard: GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601, ... are professional of supplying carbon structure steel cold draw and extruded tube seamless by standard GB/T3639,8162,3087,ASTM A106,A192 ... -400mm Wall thickness 0.5-40mm4.Packing: exporting packing Steel Tube