... steel pipemainly trades in all kinds of welded Steel Pipes and Tubes such as OCTG, Line Pipes, as well as ... Heat Exchanger, Mechanical, Square & Rectangular Tubes, Conduit Pipes, Stainless and Relevant Pipe Fittings and Valves under world standard of ASTM / ASME, API, DIN ... , JIS, supplying to USA, Canada, Europe and Southeast Asia, ...