Product: SEAMLESS STEEL PIPE Standard: API 5L, GB/T8163, ASTM A106, ASTM A500, ASTM A59 Product: SEAMLESS STEEL PIPEStandard: API 5L, GB/T8163, ASTM A106, ASTM ... : exploition or transmission of petroleum and natural gas, water and mineral slurry, building construction, steel constructure chemical industries and other related industries.