Steel Tube Standard: GB/T3639,8162,3087,ASTM A106,A192,BS3059,3601,3602,6323, DIN1629,1630, JIS G3454 Grade: ... 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,BS3059,3601,3602,6323,DIN1629,1630,JIS G34542.Grade ...