Certificates: TUV ISO9001:2008, PED, AD2000, API, PEMEX, CRCC, ISO14001, OHSAS18001 etc. Hebei Ahad Tubeline co.,ltd is a professional manufacturer of pipeline and fittings, can produce various elbows, bends, tees, crosses, reducers, caps, flanges and other pipe fittings from carbon steel, alloy steel ,stainless steel, and low-temperature steel, according to national or international standards with annual production reaching 30,000tons.