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steel welding tubes, steel welding tubes Suppliers and ASTM A53 carbon erw welded steel pipe, API 5L 0.5-8 inch sch40 straight seam steel pipe and tube for oil and gas US $350.00-$550.00 / Ton 10.0 Tons (Min. Order)Steel Tube Manufacturers - Seamless & Welded Tubes FactorySteel Tube Manufacturers, Suppliers, Stockist Boiler Tube, Heat Exchanger Tube, Seamless Tube, U Bent Tube. We specialize in manufacturing Heat Exchanger Tube, Seamless Tube, Boiler Tube, and U Bent Tube. We are manufacturers and suppliers of all types seamless and welded steel tubes in sizes range of 4mm OD to 254 OD, in wall thickness upto 40mm.