Seamless Steel Pipe Standard: GB/T3639,8162,3087,ASTM A106,A192, ... ,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 ...