Concast Process

Advanced Manufacturing Process

TMT bars are Thermo Mechanically Treated Steel bars. They form the mainstay of the construction sector and we would love our customers to know how we make the Best TMT Bars for them. Being one of the Leading TMT Bar Manufacturers in West Bengal we try to be transparent to our customers providing them with a detailed account of the procedure of TMT Bar manufacture.

The procedure mainly comprises of the following steps. Each and every consecutive step ensures that each and every TMT bar produced from the Concast Maxx manufacturing unit has the qualities of being called as the Best TMT bar for construction in West Bengal. They mainly comprise of-

The quality of the TMT bar depends on three main factors.
Pre-treatment of steel

This is the start of Steel making and includes combining oxygen and carbon in the iron in the oxygen furnace to eliminate carbon dioxide, we try to provide maximum unadulterated TMT bars. Next, the steel is passed through an electric arc furnace to refine its composition.

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 to produce the Best quality TMT bars.

Advanced thermomechanical treatment


The hot-rolled bars enter the water spray system known as the ‘Thermex System’. As one of the most responsible 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 Quenching is done, the rebars are ready for tempering the outer layer that forms a ‘Tempered Martensitic’

Atmospheric Cooling

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 ferritic-pearlite structure. Therefore, the final rebars have solid outer layer with a ductile core. This process is done to enhance the tensile strength that makes the rebars weldable and tensile

The TMT bars are made with an integrate process where raw material is transformed into the desired product. Concast Maxx is one of the Top TMT bar companies in Kolkata with a journey of years which shows efficiency in all its manufacturing procedure.

With our quality assurance and unmatched after-sales support, we have become a leading contributor to big construction projects in West Bengal.

MAXXimum Weldability

For better welded joints and no loss of strength.

MAXX Fire Resistance

No loss of strength due to temperature upto 600°C.

MAXX Corrosion Resistance

Corrosion resistant to withstand damage caused by oxidization and or any other chemical reactions.

MAXXimum Formability

Excellent due to uniform elongation. Bend 1D and Re-bend 4D.

MAXXimum Ductility and fatigue strength

Very high. Best suited for earth-quake resistant structures and equipment foundations.

MAXXimum Workability

Pre-welded meshes can be utilized to eliminate manual binding at site which saves construction time. Offers easy working at site due to excellent features of ductility and bendability which reduces fabrication time.