Steel hollow sections
A hollow structural section (HSS) is a type of metal profile with a hollow 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.
Steel grades: S235JR, S275JR, S355J2, St3sp, St3ps
Standard: EN 10219-1/2, EN 10210-1/2, EN , 10305-5, ГОСТ 30245-2003