... pipe : 1 Standard: GB/T8162 ASTM A53, ASTM A106, ASTMA519, ASTMA252, DIN1629, JIS G 3441, EN 1021 GB/T8162 Structural Seamless pipe ... :1 Standard: GB/T8162 ASTM A53, ASTM A106, ASTMA519, ASTMA252 ... :http://www.hbbrpipe.comTel:86-317-7103869Mobile:86-317-15227551303 GB/T8162 Structural Seamless pipe