Ratnamani Metals and Tubes Ltd. Offer Heat Exchanger Stainless Steel Welded Tubes and Pipes. Ratnamani Metals and Tubes Ltd. Have been awarded ISO 9001:2000 certification. Heat Exchanger Stainless Steel Welded Tubes and Pipes consist of a range of tube mills, cold finishing section, heat treatment furnaces, u-bending facility and testing facilities to manufacture high quality products confirming to international standards. Heat Exchanger Stainless Steel Welded Tubes and pipes are capable of manufacturing martensitic, ferritic, and austenitic and various duplex grades. These pipes and tubes are used in oil and gas exploration, refineries & petrochemicals, thermal and nuclear power plants, chemical industries, fertilizer plant, desalination plants, aero-space, pharmaceutical, food and dairy, automobile sugar, paper industries etc.