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TMT Bars
TMT stands for Thermo-Mechanical-Treatment. The essential step during the manufacture of TMT bars is the usage of Quenching and Tempering technique, which gives the TMT Bars their strength.
Quenching is the process during which the extremely hot bars coming straight out of the rolling mill are suddenly cooled down with the help of water and air pressure. This cools down the bars from the outside and forms a marten site on the surface of the bar, while the core of the bar remains hot. Tempering takes place when the bar passes out of the quenching or cooling system, when the heat at the core passes out into the surface.
The Quenching and Tempering technique ensures that the core of the bar contains ferrite pearlite, which is has a soft, fine-grained structure. At the same time the technique provides the surface of the bar with tempered marten site, which is very hard. This results in giving the bars high strength as well as ductility.
The bars that pass through this process are called TMT Bars.
Specific Size and Weight:
| Dia (mm) | Minimum | Maximum | Tolerance (BIS) |
|---|---|---|---|
|
8 |
0.367 |
0.395 |
±7% |
|
10 |
0.574 |
0.617 |
±7% |
|
12 |
0.844 |
0.888 |
±5% |
|
16 |
1.500 |
1.579 |
±5% |
|
20 |
2.393 |
2.467 |
±3% |
|
25 |
3.739 |
3.855 |
±3% |
|
32 |
6.126 |
6.316 |
±3% |
|
36 |
7.750 |
7.990 |
±3% |
|
40 |
9.564 |
9.860 |
±3% |
Chemical Compostion:
| Grade | C% (Max) | S%(Max) | P%(Max) | Mn%(Max) | Si%(Max) |
|---|---|---|---|---|---|
|
Fe – 415 |
0.25 |
0.055 |
0.055 |
0.055 |
0.30 |
|
Fe – 500 |
0.25 |
0.050 |
0.050 |
0.060 |
0.30 |
|
Fe – 500D |
0.25 |
0.045 |
0.045 |
0.075 |
0.30 |
Mechanical Properties:
| Properties | Fe - 415 (%) | Fe - 500 (%) | Fe - 500 D (%) |
|---|---|---|---|
|
Yield Stress, N/mm2 |
415 |
500 |
500 |
|
Tensile Strength |
485 |
545 |
565 |
|
Elongation |
14.5 |
12 |
16 |
TMT Bar Bend Properties:
| Sr. No. | Diameter of Rod | Mandrel for Fe - 415 | Mandrel for Fe - 500 |
|---|---|---|---|
|
1 |
08 mm |
24 mm (3→) |
32mm (4→) |
|
2 |
10 mm |
30 mm (3→) |
40 mm (4→) |
|
3 |
12 mm |
36 mm (3→) |
48 mm (4→) |
|
4 |
16 mm |
48 mm (3→) |
64 mm (4→) |
|
5 |
20 mm |
60 mm (3→) |
80 mm (4→) |
|
6 |
25 mm |
100 mm (4→) |
125 mm (5→) |
|
7 |
28 mm |
112 mm (4→) |
140 mm (5→) |
|
8 |
32 mm |
128 mm (4→) |
160 mm (5→) |
|
9 |
36 mm |
144 mm (4→) |
180 mm (5→) |
|
10 |
40 mm |
160 mm (4→) |
200 mm (5→) |
TMT Bar ReBend Properties:
| Sr. No. | Diameter of Rod | Mandrel for Fe - 415 & 500 bend | Mandrel for Fe - 415 & 500 Re Bend |
|---|---|---|---|
|
1 |
08 mm |
24 & 32 mm |
40 mm (5→) |
|
2 |
10 mm |
30 & 40 mm |
50 mm (5→) |
|
3 |
12 mm |
36 & 48 mm |
84 mm (7→) |
|
4 |
16 mm |
48 & 64 mm |
112 mm (7→) |
|
5 |
20 mm |
60 & 80 mm |
140 mm (7→) |
|
6 |
25 mm |
100 & 125 mm |
175 mm (7→) |
|
7 |
28 mm |
112 & 140 mm |
196 mm (7→) |
|
8 |
32 mm |
128 & 160 mm |
224 mm (7→) |
|
9 |
36 mm |
144 & 180 mm |
252 mm (7→) |
|
10 |
40 mm |
160 & 200 mm |
280 mm (7→) |
