... , Q235A, Q235B, Q345, ASTM A53/106, ASTMA500, ST375.Standards:GB/T3091-2001, GB/T9711.1-1997, GBT8162, GBT8163, GBT3087, API 5L 6 ... China, and the steel pipes can be supplied according to GB, ASTM, API, DIN, JIS standards, the factory is locating in ...