... or bulk Material grade: J55, K55, N80, L80, T95, 11 3/4" oil pipeCasing and Tubing Standard: API 5CT,Carbon Steel11 ... or bulk Material grade: J55, K55, N80, L80, T95, 13 3/8"oil casingCasing and Tubing Standard: API 5CT,Carbon Steel13 ... steel pipes for pipelineHigh-pressureSeamless pipes for fertilizer making equipment20, 16Mn,Q345GB6479-200018-530*3-40Fertilizer making equipment and pipe lineLow and ...