Ratnamani Metals and Tubes Ltd. Supply Heat Exchanger Stainless Steel Seamless Tubes and Pipes. Ratnamani Metals and Tubes Ltd. Is an ISO 9001:2000 registered company. Heat Exchanger Stainless Steel Seamless Tubes and Pipes consist of a hot extrusion press, number of cold pilgering mills, draw benches, heat treatment furnances, u-blending facilities and all necessary testing equipments to produce high quality tubes & pipes confirming to various international standards. Heat Exchanger Stainless Steel Seamless Tubes and Pipes are available in the thickness of 1.00mm to 4.00mm. Heat Exchanger Stainless Steel Seamless Tubes and Pipes is used in oil and gas exploration, refineries & petrochemicals, thermal and nuclear power plants, chemical industries, fertilizer plant, aero-space, pharmaceutical, food and dairy application etc.