TMT bars or Thermo-Mechanically Treated bars are high-strength reinforcement bars having a tight outer core and a soft inner core. The very first step of the manufacturing
process involves passing the steel wires through a rolling mill stand. After that, these rolled steel wires pass through the temp core water cooling system. While crossing the cables through the cooling water system, the water pressure is optimized. The sudden quenching and drastic change in temperature toughen the outer layer of the steel bar, thus making it super sturdy and durable.
Once this process is over, the TMT bars are subject to atmospheric cooling. It is done to equalize the temperature difference between the soft inner core and the tough exterior. Once the TMT bar cools down, it slowly turns into a ferrite-pearlite mass. The inner core remains soft, giving the TMT bar high tensile strength and elongation point. This design is unique to the TMT bars and provides superior flexibility for the bars. Also, this unique manufacturing technique and the absence of Cold stress make this bar corrosion-resistant and boost its weldability.
TMT bars have high demand. Given below are the advantages and applications of these bars.
Advantages of using TMT bars:
DIMENSION AND PROPERTIES |
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AS PER ISI SPECFICATION IS: 1786 |
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(mm) |
(cm2) |
(Kg/Mtr) |
(Kg/Mtr.) |
(Mtr/MT) appx |
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8 | 0.5 | 0.4 | 0.37 | - | 0.42 | 2500 |
10 | 0.78 | 0.62 | 0.57 | - | 0.66 | 1600 |
12 | 1.13 | 0.89 | 0.84 | - | 0.93 | 1100 |
16 | 2.01 | 1.58 | 1.5 | - | 1.66 | 630 |
20 | 3.14 | 2.47 | 2.39 | - | 2.54 | 400 |
22 | 3.8 | 2.99 | 2.9 | - | 3.07 | 330 |
25 | 4.91 | 3.86 | 3.74 | - | 3.97 | 260 |
28 | 6.16 | 4.83 | 4.69 | - | 5.98 | 200 |
32 | 8.04 | 6.31 | 6.13 | - | 6.51 | 155 |
36 | 10.18 | 7.99 | 7.75 | - | 8.23 | 120 |
40 | 12.57 | 9.85 | 9.57 | - | 10.17 | 100 |
GRADES AVAILABLE: FE 415/FE 500/ FE 550/ FE 600 |