Open sections

Hot-rolled steel I-, H-, C- and L-sections (defined in Table 1.1) are produced by continuous rolling of raw steel slabs, in a process in which the steel is sufficiently hot and malleable so that it can be formed into shapes dictated by repeated passing through multiple pairs of rolls. For I- or H-sections, internal rolls define the internal dimensions of the section and the thickness of the web, whereas external rolls control the required thickness of the flanges.

Although the rolling process is relatively simple in principle, the number of passes through the rolls and the rates of cooling are carefully controlled in order to achieve the correct dimensions and to avoid lamination problems, particularly for thicker steel flanges.

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