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 ... ,Ck40,Ck45,Ck50,60,67,15Mn3,21Mn4,30Mn4,36Mn4,40Mn4By BS:040A10,12,040A12,080A15,20,070M26,080M30,36,40,46 ... -400mm Wall thickness 0.5-40mm4.Packing: exporting packing Steel Tube