... to API 5L Gr.B standard.GB/TB163, GB/T8162, GB/T3087, GB/T17396;DIN28180, DIN2448, DIN17175, DIN2460;JIS G3444, G3445, G3454, G3456 ... , G3461;ASTM A106, A53, A179, A192, A252, A500;API 5L Gr.B spec 1/2.Material:According to ... NACE MR 0175 standard.Q345, ST35.8, ST37, ST42, ST52, A53, A106 ...