Rectangular hollow sections appear as described in their name in the form of a rectangular tube.

 

RHSs are described by their depth, width and wall thickness

200 x 100 x 8 RHS

200 mm = depth (height)

100 mm = width

8 mm = wall thickness

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Hot rolled RHSs are made at the mill as one piece, whereas cold formed RHSs are made of a flat sheet rolled at right angles and welded.

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It is therefore easy to note the difference, as the cold rolled RHSs have a weld all along its length.