The implemental standards for the oil casings are API 5CT; the specifications include from 60.3 to 508mm; the steel grades include J55, K55, N80, L-80, P-110, C-90, C - 95, T-95 and so on; the merchantable claspers are STC , LTC, BTC . The implemental standards for the oil pipelines are API 5L; the specifications include from 219.1 to 2032mm; the steel grades include Gr.B, X42, X46,X56,X60,X70,X80 and so on At the same time we also supply a large number of seamless steel pipes in different uses, such as fluid pipes and structural pipes. Besides that, we have many years of co-operation ships with Tianjin Large Seamless Company, Baogang Steel Pipe Company, Anshan Steel Pipe Company, which make sure our abundant resources.