The Birla TMT Fe 550D TMT Bar Birla Fe 550D TMT Bar - 12 mm is produced through the thermomechanical treatment process to comply with IS 1786:2008, delivering a 12 mm diameter bar in standard 12 m lengths with certified mechanical properties. With a guaranteed yield strength of 550 MPa and tensile strength of 600 MPa, this TMT bar is purpose-engineered for seismic-resistant ductile frame and critical structural concrete applications. Its ribbed surface profile provides excellent mechanical bond with concrete, while the controlled ductility of 14.5% elongation ensures structural safety under seismic and dynamic loading conditions.

• IS 1786:2008 Fe 550D grade with traceable ductility and high-strength test records
• QST process delivering 550 MPa yield with enhanced 600 MPa UTS requirement
• 14.5% elongation — well above Fe 550 — for ductile high-strength seismic design
• D-suffix specification designed for seismic zone ductile high-strength frames
• Ribbed geometry ensuring strong concrete bond and controlled anchorage behaviour
• Controlled chemistry for site weldability in high-strength ductile frame zones
• Preferred for IS 13920 compliant seismic detailing in high-strength construction
• 12 m standard mill lengths compatible with standard project scheduling practice
• Enables steel-optimised seismic designs with fewer, lighter reinforcing bars
• Suitable for critical columns, shear walls, and coupling beams in high-rise RCC

• IS 13920 compliant high-strength ductile frame members in seismic zones
• Coupling beam and link beam reinforcement in seismic shear wall systems
• High-rise building basement and podium-level column primary members
• Seismically designed bridge piers, abutments, and approach slab structures
• Critical nuclear and defence facility structural frame reinforcement
• Heavily loaded industrial frame structures in seismic hazard areas
• Elevated metro and monorail structure reinforcement in seismic zones
• High-strength seismic-zone raft and deep pile foundation reinforcement