Product: SEAMLESS STEEL PIPE Standard: API 5L, GB/T8163, ASTM A106, ASTM A500, ASTM A57 Product: SEAMLESS STEEL PIPEStandard: API 5L, ... GB/T8163, ASTM A106, ASTM A500, ASTM A53 Steel grade: A B X42-X70 10# 20# Q195 Q215 ... : exploition or transmission of petroleum and natural gas, water and mineral slurry, building construction, steel constructure chemical industries and other related industries.