TMT steel

Thermo mechanically treated steel known as TMT steel can be described as a new-generation-high-strength steel having superior properties such as weldability, strength, ductility and bendability meeting highest quality standards at international level. Under thermo mechanical treatment of bars, the steel bars are made to pass through a specially designed water cooling system where these are kept for such a period that outer surface of bars becomes colder while the core remains hot. This creates a temperature gradient in the bars. When the bars are taken out of the cooling system, the heat flows from the core to the outer surface causing further tempering of steel bars thereby helping them in attaining higher yield strength of steel.

To decide the percentage of carbon content in steel has been a major challenge for the engineers. While a certain minimum carbon content in steel is essential to achieve the required strength, an excess of carbon content threatens its property of weldability. In TMT bars, this problem has been eliminated. In these bars, the carbon content can be restricted to 0.2% to attain weldability and at the same time no strength is lost on this account. The joints can be welded by ordinary electrodes and no extra precautions are required. SAIL and RINL (Rastriya Ispat Nigam Limited) are doing a good job in producing TMT bars.

Another advantage of TMT bars is their tough surface providing high yield strength and a soft core providing excellent ductility. Strength, weldability and ductility are such properties which declare TMT steel highly economical and safe for use. An additional advantage of TMT steel is that a twisting operation is included in Tor steel, which subjects the bars to torsional stresses making them less corrosion resistant while TMT bars are free of such stresses thus having superior corrosion resistance.

KINGSHUK BCE I JU