Indostar presents the Indostar Fe 550D TMT Bar - 12 mm, a 12 mm Fe 550D Thermo-Mechanically Treated deformed rebar conforming to IS 1786:2008 (High Strength Deformed Steel Bars and Wires for Concrete Reinforcement). The Fe 550D grade is specifically engineered for heavy-duty, high-load, and seismic-critical reinforced concrete applications, delivering 550 MPa minimum yield strength, 600 MPa tensile, and 14.5% elongation — a performance combination unavailable in standard Fe 550, providing high strength with enhanced ductility (D-grade) for superior seismic performance and safe structural behaviour. Produced in 12 m standard lengths, this 12 mm IS-marked rebar is optimised for slab main reinforcement, secondary beam bars, column ties, and wall reinforcement, with uniform rib dimensions ensuring superior bond and reliable structural performance across all RCC categories.

• IS 1786:2008 Fe 550D certified — yield ≥ 550 MPa, tensile ≥ 600 MPa, elongation ≥ 14.5%
• D-designation advantage: 14.5% elongation enables superior energy absorption in seismic events
• 12 mm diameter ribbed bar in 12 m lengths — consistent dimensional accuracy throughout
• Thermo-Mechanical Treatment creates dual-phase microstructure: strength at surface, ductility at core
• UTS/YS ≥ 1.08: ensures post-yield strength reserve and ductile failure mode
• Controlled surface deformation for high bond strength — no slip under static or cyclic loading
• Low carbon equivalent ensures site weldability and eliminates hydrogen cracking risks on site
• Resistant to atmospheric corrosion due to oxide-rich, scale-free TMT surface characteristics
• Suitable for automated bar bending and cutting — uniform properties throughout 12 m length
• Certified per IS mark scheme with lot-wise MTC for each heat batch supplied

• Confining reinforcement in seismic column and beam-column joint zones per IS 13920
• High-load transfer beams, coupling beams, and belt truss reinforcement in tall buildings
• Industrial chimney stacks, RCC silo walls, and bunker reinforcement in heavy industry
• Cable-stayed and suspension bridge pylon, anchorage, and deck reinforcement
• Deep retaining walls, secant and contiguous pile walls for deep excavation support
• Offshore gravity-base concrete platforms and subsea foundation concrete structures
• Repair and structural retrofit of existing RCC structures with compatible high-grade rebar