The TMT i. e Thermo metallurgical treatment to the bar is imparted by treating the hot bar by water. In the roiling mill, the billets / ingots are heated in the reheating furnace and rolled through different rolls, progressively reducing the section. The bar releasing from the final stand is subjected to water treatment. The process involves the following stages:

It begins when the hot rolled bar leaves the final mill stand and is rapidly quenched by water injection through various nozzles. This converts the surface layer of the bar to a hardened structure called ‘Martensite’' while the core remains hot and austenitic.

It begins when the bar leaves the quenching box with a temperature gradient through its cross section, the temperature of the core being higher than that of the surface. This allows heat to flow from the core to the surface, resulting in tempering of the surface, giving a structure called "Tempered Martensite" which is strong and tough. The core is still austenitic at this stage.

It takes place on the cooling bed, where the austenitic core is transferred to a ductile ferrite-pearlite. Thus, the final structure consists of a combination of strong outer layer of tempered martensite and a ductile core of ferrite-pearlite.

Thus the bar finally obtained attains higher strength with excellent ductility. During the process of manufacturing TMT Bars at every interval of 30 minutes, the bar samples are taken out for testing. There is in-house chemical and physical testing laboratory with UTS machine of capacity 60 tons and 100 tons. The results like Elongation, Tensile and ultimate strengths are obtained on the above computerized machines.

For better bondage with concrete the lugs on the roller are carved with special care for every dimensions. These lugs are carved on ‘CNC’ machine. The bars are branded as "MHLAXMI" at every meter length of bar, carved on the rolls by SPM machine. The precise control of the thermo metallurgical treatment process results in a uniform and correctly tempered martensite, completely free from internal stresses. The quenching box provided is of 12 meter length, which results in homogeneous metallurgical transformation.