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Mild steel rectangular tube (also known as mild steel rectangular hollow section or box section) is hot rolled steel that has been formed into a rectangular tube.

Mild steel rectangular tube is measured by taking the outer dimensions (which are different) and then the wall thickness.

Steel rectangular tube/box section is commonly referred to as HSS, meaning Hollow Structural Section. Typically it has an inside seam due to it being welded.

Mild steel rectangular tube applications include trailers, barriers, bike racks, home construction and many more. A mild steel rectangular hollow section is used in general fabrication where strength is a requirement.

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