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Concept
Structural steel
Summary
Structural steel is a category of steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a of a specific cross section. Structural steel shapes, sizes, chemical composition, mechanical properties such as strengths, storage practices, etc., are regulated by standards in most industrialized countries.
Most structural steel shapes, such as -beams, have high second moments of area, which means they are very stiff in respect to their cross-sectional area and thus can support a high load without excessive sagging.
The shapes available are described in many published standards worldwide, and a number of specialist and proprietary cross sections are also available.
beam (-shaped cross-section – in Britain these include Universal Beams (UB) and Universal Columns (UC); in Europe it includes the IPE, HE, HL, HD and other sections; in the US it includes Wide Flange (WF or W-Shape) and sections)
Z-Shape (half a flange in opposite directions)
HSS-Shape (Hollow structural section also known as SHS (structural hollow section) and including square, rectangular, circular (pipe) and elliptical cross sections)
Angle (-shaped cross-section)
Structural channel, or -beam, or cross-section
Tee (-shaped cross-section)
(asymmetrical -beam)
Railway rail
Vignoles rail
Flanged rail
Grooved rail
Bar, a long piece with a rectangular cross section, but not so wide so as to be called a sheet.
Rod, a round or square section long compared to its width; see also rebar and dowel.
Plate, metal sheets thicker than 6 mm or in.
Open web steel joist
While many sections are made by hot or cold rolling, others are made by welding together flat or bent plates (for example, the largest circular hollow sections are made from flat plate bent into a circle and seam-welded).
The terms angle iron, channel iron, and sheet iron have been in common use since before wrought iron was replaced by steel for commercial purposes.
Official source
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