Seamless Steel Pipe Standard: GB/T3639,8162,3087,ASTM A106,A192, BS3059,3601,3602,6323, DIN1629,1630, JIS G3454 Grade:1010, St Seamless Steel PipeWe ... are professional of supplying carbon structure steel cold draw and extruded tube seamless by standard GB/T3639,8162,3087,ASTM A106,A192 ... , BS3059,3601,3602,6323, DIN1629,1630, JIS G3454 1.Standard:GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601,3602 ...