In the UK, or other countries which follow British construction or engineering terminology, the term HSS is not used. The wall thickness is uniform around the section. (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. Circular HSS are sometimes mistakenly called steel pipe, although true steel pipe is actually dimensioned and classed differently from HSS. Rectangular and square HSS are also commonly called tube steel or box section. HSS is sometimes mistakenly referenced as hollow structural steel. HSS is only composed of structural steel per code. HSS members can be circular, square, or rectangular sections, although other shapes such as elliptical are also available. The term is used predominantly in the United States, or other countries which follow US construction or engineering terminology. A hot-rolled HSS-box section cut open with a bandsaw, demonstrating residual stress.Ī hollow structural section ( HSS) is a type of metal profile with a hollow cross section.
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