Hollow section is a type of metal profile. They are commonly made from cold-rolled steel and formed into a hollow, tubular section. This profile creates a gaping unfilled edge that extends throughout the whole steel bar, which is what gives them the alternative names of "box section" and "hollow section."
Steel hollow section also known as structural steel tube and hollow structural sections (HSS) is a type of steel that is formed into a hollow tubular section.
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