This is the start of steel making and includes combining oxygen and carbon in the iron in the oxygen furnace to eliminate carbon dioxide. Next, the steel is passed through an electric arc furnace to refine its composition.
Now the liquid steel is transferred to a ladle and next to a continuous casting machine. Molten steel flows out of the ladle into the casting machine and then into a water-cooled mold where solidification starts. The billets that come out from the CCM (continuous casting machine) are sized as the length required.
The hot-rolled bars enter the water spray system known as the ‘Thermex System.’ As one of the best quality TMT bar manufacturers in Kolkata, we use Thermex Technology to cool the outer core fast and make sure that the TMT rebars are ductile. Rapid cooling causes optimized hardening of the TMT bars that enable forming a martensitic rim with an austenitic and hot core. This cooling technology is called Quenching.
After self-tampering is done, the bars are transferred to the cooling bed kept at an average temperature. Here the austenitic core transforms into a ferrite-pearlite structure. Therefore, the final rebars have a solid outer layer with a ductile core. This process is done to enhance the tensile strength that makes the rebars weldable and tensile.
