Structural Steel
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Carbon-manganese steel produced in standard shapes (I-beam, angle, channel) for load-bearing construction and infrastructure applications.
Structural steels form the skeletons of buildings, bridges, and infrastructure. They are specified by minimum yield strength rather than chemical composition, allowing steelmakers flexibility in production. Modern high-strength low-alloy (HSLA) structural steels achieve yield strengths above 690 MPa while maintaining weldability.
Designation Guide
ASTM A36 (250 MPa yield) is the basic structural grade in North America. A992 (345 MPa yield) is standard for wide-flange beams. A572 Grade 50 is equivalent to A992 for plates and shapes. European S-grades (S235, S275, S355, S460) indicate minimum yield strength in MPa. For weathering applications, A588 (Corten) develops a protective rust patina.
Selection Tips
A992 is the standard starting point for building frames in the US. For bridges, specify A709 Grade 50W (weathering) or HPS 70W (high-performance steel) for critical tension members. In seismic zones, verify that steel meets supplementary requirements for Charpy V-notch toughness. For architecturally exposed steelwork (AESS), specify closer rolling tolerances and surface quality requirements.