IS 2062 — Structural Steel

IS 2062:2011 — 'Hot Rolled Medium and High Tensile Structural Steel - Specification' is the Indian standard for general-purpose structural steel used in buildings, bridges, and industrial structures. Replaces IS 2062:2006 and earlier 1992 editions. Specifies chemical composition, mechanical properties, and tolerances for hot-rolled steel sections (beams, channels, angles, plates, hollow sections) and bars produced in Indian mills. Major manufacturers: SAIL, JSW, JSPL, Tata Steel, ESSAR Steel, ArcelorMittal Nippon Steel.

Key IS 2062 specifications: (1) Steel grades — Fe-410 (E-250 in 2011 nomenclature, fy 250 MPa), Fe-490 (E-330, fy 330), Fe-540 (E-380, fy 380), Fe-590 (E-460, fy 460). The 'E' nomenclature is the SI-based classification reflecting yield strength. (2) Mechanical properties — yield strength, tensile strength, elongation on 5.65√A gauge length, bend test, impact toughness (Charpy V-notch). (3) Chemical composition — limits on carbon, manganese, phosphorus, sulphur, silicon, plus combined chromium + nickel + copper for high-strength grades. (4) Through-thickness properties — Z15 / Z25 quality for plates >25 mm to prevent lamellar tearing. (5) Surface defect criteria. (6) Dimensional tolerances per the relevant section standard (IS 808 etc.).

Indian steel construction predominantly uses Fe-410 (the dominant grade for general structural members), with Fe-490 and Fe-540 used for high-strength applications (heavy industrial, long-span). Fe-590 is reserved for specialty applications. The 2011 revision introduced through-thickness Z-quality for plates >25 mm, improving lamellar-tearing resistance — important for heavy welded plate-girder construction. Modern Indian fabrication shops require mill test certificate (MTC) for every consignment; site QC sample-tests 1 in 50 t for important works. The most-overlooked aspect: through-thickness quality — many Indian residential and small commercial projects use plates without specified Z-quality, sometimes leading to lamellar tearing in heavy welded connections.