Quality :Grade A Certificate:ISO9001:2000 Material: carbon stee ,stainless steel ,forged carbon ... : Seamless steel tubes/ pipes, Cold drawn steel tubes/ pipes, API SPEC 5L pipes, MATERIAL Carbon Steel Tubes/Pipes ST 37, ASTM A106 Gr B ... ; A53, A210; API 5L X42, X46, X52, X56, X60, X65, X70, X80 A106 Gr. B Steel Seamless Pipe / Carbon Steel ...