European hollow sections are generally in accordance with the EN 10210 standard. Most American manufacturers adhere to the ASTM A500 or newly adopted ASTM A1085 standards, while Canadian manufacturers follow both ASTM A500 and CSA G40.21.
#Welding of hss square series#
During the manufacturing process the mother tube goes through a series of shaping stands which form the round HSS (mother tube) into the final square or rectangular shape. The edges are then welded together to form the mother tube.
During the manufacturing process flat steel plate is gradually changed in shape to become round where the edges are presented ready to weld. Other steel grades available for HSS are A847 (weathering steel), A1065 (large sections up to 50 inch sq made with SAW process), and recently approved A1085 (higher strength, tighter tolerances than A500). Today, HSS is commonly available in mild steel, A500 grade C. In the recent past, HSS was commonly available in mild steel, such as A500 grade B. The flat square surfaces of rectangular HSS can ease construction, and they are sometimes preferred for architectural aesthetics in exposed structures, although elliptical HSS are becoming more popular in exposed structures for the same aesthetic reasons. However, the HSS has superior resistance to lateral torsional buckling. HSS can also be used as beams, although wide flange or I-beam shapes are in many cases a more efficient structural shape for this application. They also have excellent resistance to torsion. This makes them good choices for columns. Square and circular HSS have very efficient shapes for this multiple-axis loading as they have uniform geometry along two or more cross-sectional axes, and thus uniform strength characteristics.
HSS, especially rectangular sections, are commonly used in welded steel frames where members experience loading in multiple directions. Typically, these designations will also relate to metric sizes, thus the dimensions and tolerances differ slightly from HSS. Rather, the three basic shapes are referenced as CHS, SHS, and RHS, being circular, square, and rectangular hollow sections. In the UK, or other countries which follow British construction or engineering terminology, the term HSS is not used. Questions are about welded connections, truss connections. Questions about welding HSS members that are answered by our technical consultant. The steel strip is unwound from coils and side-trimmed to control width and condition the edges for welding. Seam welding is commonly used during the manufacturing of round, square and rectangular steel tubing.
The wall thickness is uniform around the section.ĮRW (Electric Resistance Welded) The nomenclature ERW refers to a specific type of welding process that involves both spot and seam welding. (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. A hot-rolled HSS-box section cut open with a bandsaw, demonstrating residual stress.
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