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Steel Seamless Tubes, Seamless Black Iron Pipe, Hot Finished manufacturer / supplier in China, offering Hot Finished Carbon Steel Seamless Tubes Seamless Black Iron Pipe in China, Galvanized Square Hollow Section/Galvanized Steel Pipe, Astma500 Seamless Square Rectangular Steel Hollow Sections Used for Mining Machinery and so on.Steel Square Tube-China Steel Square Tube Manufacturers Black square pipe Manufacturers Suppliers China black China Steel Square Tube , Covering an area of 164, 000 square meters, is a comprehensive enterprise of steel deep-processing integrating ratio-frequency welded pipe, galvanized pipe, cold-rolled sheet and galvanized coil, with the annual yield capacity of 2,000, 000 tons of welded pipe, 450, 000 tons of galvanized pipe ranging