Seamless Steel Pipe Standard: GB/T3639,8162,3087,ASTM A106,A192, BS3059,3601,3602,6323, DIN1629,1630 ... extruded tube seamless by standard GB/T3639,8162,3087,ASTM A106,A192, BS3059,3601,3602,6323, DIN1629,1630, ... JIS G34541.Standard:GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601,3602,6323,DIN1629,1630,JIS G34542 ... .Grade:By ASTM:1005,1006,1008,1010,1015,1020,1025,1030 ...