This standard specifies the requirements for high strength deformed steel bars and wires (such as TMT bars) used for concrete reinforcement. It covers chemical composition, mechanical properties, nominal sizes, and dimensional tolerances.
Specifies requirements for high strength deformed steel bars and wires used as reinforcement in concrete.
Quick Reference Values
Minimum yield stress for Fe 500500 N/mm²
Minimum elongation for Fe 500D16%
Mass tolerance (upto 10mm batch)±7%
Mass tolerance (12mm to 16mm batch)±5%
Mass tolerance (over 16mm batch)±3%
Maximum Carbon Equivalent (CE) for Fe 500D0.42%
Key Formulas
CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 — Carbon Equivalent Formula
Practical Notes
Always specify 'D' or 'S' grades (e.g., Fe 500D, Fe 500S) in seismic zones due to their higher ductility, greater elongation, and lower carbon footprint.
Perform rolling mass tolerance checks at the site. Under-weight bars compromise structural safety, while over-weight bars cause quantity overruns.