Tmt Bar — Up Close
High-strength ribbed bars with superior bonding, available in 8mm to 32mm diameters.
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04The Thermo-Mechanical Treatment Process
TMT bars undergo a precision multi-stage thermomechanical process that gives them a uniquely tough outer shell and a ductile inner core — impossible to achieve with conventional cold-twisted methods.
High-quality steel billets are heated to approximately 1,200°C and fed through a continuous multi-stand rolling mill. Each pass progressively reduces the cross-section and forms the characteristic surface ribs that give TMT bars their superior bonding with concrete.
The hot rolled bar passes immediately through the Tempcore water-quenching system. Precisely calibrated water pressure transforms the outer layer into a hard martensitic structure while the interior remains austenitic — the defining step that separates TMT from all other reinforcement steel.
Residual heat from the inner core radiates outward, self-tempering the outer martensite into a tough yet resilient structure. This controlled equalisation gives TMT bars their remarkable combination of high yield strength and elongation.
On the cooling bed, the inner core transforms from austenite into a ferrite-pearlite microstructure — soft and ductile, responsible for exceptional elongation at break. The absence of cold-working stress makes these bars inherently corrosion-resistant and easy to weld on site.
The tough tempered-martensite exterior bears structural loads while the soft ferrite-pearlite core absorbs seismic energy through controlled deformation before fracture. For structures in seismic zones II–V, IS:13920 mandates precisely this ductility profile. Every bundle from Vishwageeta Ispat includes mill test certificates confirming IS:1786 compliance.
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We stock and supply directly from India's top TMT manufacturers — with original mill test certificates.
Standard Charts & Specifications
IS:1786 compliant data for procurement and structural planning.
| Title | Dia (mm) | Wt/Metre (kg) | Rods/Bundle | Bundle Wt (kg) |
|---|---|---|---|---|
| TMT Bar | 8 mm | 0.395 | 10 | 47.4 |
| TMT Bar | 10 mm | 0.617 | 7 | 64.8 |
| TMT Bar | 12 mm | 0.888 | 5 | 66.6 |
| TMT Bar | 16 mm | 1.580 | 3 | 71.1 |
| TMT Bar | 20 mm | 2.470 | 2 | 74.1 |
| TMT Bar | 25 mm | 3.850 | 1 | 57.8 |
| TMT Bar | 28 mm | 4.830 | 1 | 72.5 |
| TMT Bar | 32 mm | 6.310 | 1 | 94.7 |
| Title | Element | Fe 500 (max %) | Fe 550D (max %) |
|---|---|---|---|
| TMT Bar | Carbon (C) | 0.30 | 0.25 ↓ |
| TMT Bar | Sulphur (S) | 0.060 | 0.040 ↓ |
| TMT Bar | Phosphorus (P) | 0.060 | 0.040 ↓ |
| TMT Bar | S + P (combined) | 0.110 | 0.075 ↓ |
| TMT Bar | Elongation | 12% min | 16% min ↑ |
| TMT Bar | UTS/YS Ratio | 1.08 min | 1.10 min ↑ |
Which Grade Is Right for Your Project?
- Residential homes up to ground + 1 floor
- Boundary walls, compound structures
- Rural and semi-urban housing
- Non-seismic zone construction
- Cost-effective choice for smaller budgets
- High-rise buildings (G+4 and above)
- Seismic zones II, III, IV, and V
- Bridges, flyovers, and infrastructure
- Commercial complexes and malls
- Projects requiring IS:13920 compliance
FAQ — From TMT Users
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- Mill test certificate provided with every order