Structural steel : ¤ÇÒÁËÁÒÂ
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Structural steel is steel construction material, a profile, formed with a specific shape or cross section and certain standards of chemical composition and strength. Structural steel shape, size, composition, strength, storage, etc, is regulated in most industrialized countries. Structural steel members, such as I-beams, have high second moments of area, which allow them to be very stiff in respect to their cross-sectional area. sourse:http://en.wikipedia.org/wiki/Structural_steel |
