Editing Hollow structural section (section)

{{short description|Type of metal profile}}
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[[File:Rezidual Stress.JPG|thumb|A hot-rolled HSS-box section cut open with a bandsaw, demonstrating [[residual stress]]]]

A '''hollow structural section''' ('''HSS''') is a type of metal [[profile (engineering)|profile]] with a hollow [[cross section (geometry)|cross section]]. The term is used predominantly in the United States, or other countries which follow US construction or engineering terminology.

HSS members can be circular, square, or rectangular sections, although other shapes such as elliptical are also available. HSS is only composed of [[structural steel]] per code.

HSS is sometimes mistakenly referenced as ''hollow structural steel''. Rectangular and square HSS are also commonly called ''tube steel'' or ''box section''. Circular HSS are sometimes mistakenly called ''[[steel pipe]]'', although true steel [[Pipe (material)|pipe]] is actually dimensioned and classed differently from HSS. (HSS dimensions are based on exterior dimensions of the profile; pipes are also manufactured to an exterior tolerance, albeit to a different standard.)  The corners of HSS are heavily rounded, having a radius which is approximately twice the wall thickness. The wall thickness is uniform around the section.

In the UK, or other countries which follow British construction or engineering terminology, the term ''HSS'' is not used.  Rather, the three basic shapes are referenced as CHS, SHS, and RHS, being circular, square, and rectangular hollow sections.  Typically, these designations will also relate to metric sizes, thus the dimensions and tolerances differ slightly from HSS.