TMT stands for Thermo Mechanically Treated. The TMT bars have a hard outer surface and a softer core. Their manufacturing process includes hot rolled steel wires passed through water. This makes the surface hard and keeps the core warmer and softer.
| Grade | Fe 415 | Fe 500 | Fe 500D |
|---|---|---|---|
| C% Max | 0.30 | 0.30 | 0.250 |
| P% Max | 0.06 | 0.055 | 0.040 |
| S% Max | 0.06 | 0.055 | 0.040 |
| CE/SP Max | 0.110 | 0.105 | 0.075 |
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