1)api 5l gr.b sch 40 2)OD:1/2"-48" 3 ... so on.StandardsANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 / 2616, ... ,A53GRB,A53-A,A106-A,A192,A226,A315-B,A106-B,A178-C,A210-A-1,A210-C,A333- ... in advance , the balance against with the copy of B/L) Equipment Quality Control: Our products :carbon steel ,alloy ... our website , your inquiries will be reply promptly! api 5l gr.b sch 40