Birla TMT Fe 550D TMT Bar Birla Fe 550D TMT Bar - 20 mm is a high-strength thermomechanically treated reinforcing steel bar produced to IS 1786:2008, featuring a 20 mm nominal diameter in standard 12 m mill lengths. Delivering a minimum yield of 550 MPa, tensile strength of 600 MPa, and elongation of 14.5%, this bar is designed for seismic-resistant ductile frame and critical structural concrete applications where reliable load transfer and ductility are critical. The distinct transverse and longitudinal rib pattern ensures maximum mechanical interlock with concrete, reducing slip and enhancing structural integrity in reinforced concrete members.

• Fe 550D IS 1786:2008 certified TMT bar with high yield and enhanced elongation
• Thermomechanical treatment producing hard rim/ductile core at 550 MPa strength
• Yield 550 MPa and UTS 600 MPa with 14.5% elongation for seismic zone design
• Superior ductility versus Fe 550 for controlled plastic deformation in seismic events
• Ribbed bar geometry for full composite action between steel and concrete
• Site-weldable using standard IS 1786-compliant chemical composition procedures
• Supports performance-based seismic design requiring both strength and ductility
• Standard 12 m lengths for efficient procurement, scheduling, and site logistics
• Enables optimised reinforcement in seismic-critical high-strength RCC elements
• Ideal for high-rise columns, shear walls, and earthquake-resistant frame structures

• High-strength seismic frame beams and columns in zone IV/V buildings
• Earthquake-resistant RC shear walls and core walls in tall towers
• High-rise podium transfer plate and transfer beam primary reinforcement
• Seismically designed long-span bridge deck and girder reinforcement
• Special moment frame members in seismic zone critical facility buildings
• High-strength pile cage reinforcement in deep foundation seismic systems
• Heavily loaded industrial high-rise structures in seismic hazard regions
• Performance-critical nuclear, defence, and lifeline infrastructure RCC