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Steel seamless-drawn round tube is closed bent profile manufactured by hot-rolled
method without welded seam, therefore it is often called seamless hot-rolled tube.
Electric welded longitudinal tube is one of the types
of metal products range. Electric welded tube is manufactured from strips or by
welding from steel plate.
Steel rectangular hollow section
is very important and popular type of metal product on the market. Such hollow
section has high mechanical strength.