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| Product: TMT REBARS |
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| Introduction |
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| Welspun power & Steel limited (WPSL), a part of the US $ 500 million Welspun Group, has set up a state-of-the-art facility to manufactured Ribbed thermo mechanically treated (TMT) rebars. The heat treatment process ensure that the rebars meet stringent quality standards and exhibit higher strength, better ductility, bend ability and weldability over the conventional bars used in the construction industry. |
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| Stages |
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| STAGE 1 |
STAGE 2 |
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| STAGE 1 |
| The process utilizes residual heat from the rolling process to attain the desired mechanical properties. Blooms, which are heated in the re-heating furnace, are rolled through a series of rolling stands and progressively reduced to the final desired size and shape. As the hot rolled rebar emerges from the finishing stand of the bar mill, it is rapidly cooled. This quenching process by a special water spray system convert the surface layer of the bar to a hardened “Martenstic'structure While the core remains “Austenitic' |
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| STAGE 2 |
Here the ‘Tempering' begins as the bar leaves the water-cooling section.
In the stage the heat flows from the core to the surface layer, transforming it into a structure called ‘Tempered Matensite'
While the core continues to stay ‘Austenitic'.
The third and final stage involves normal cooling to room temperature where the ‘Austenitic' core is transformed to a ductile ferrite+ pearlite structure.The finished bar has a Microstructure comprising of a tough outer layer of Tempered Martensite and ductile core of ‘Ferrite+pearlite'
This composite structure gives excellent yield strength to the bar along with superior ductility and Weld ability. |
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| Quality |
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In the past, the conventional mild steel round having low yield strength were used for concrete reinforcement. These bars were then replaced by cold Twisted Deformed Bars exhibiting better yield strength.
Even with controlled carbon content, these bars continued to have the inherent problem of poor weld ability and ductility. Beside, additional twisting operation induced torsional stresses, which further reduced the corrosion resistance. |
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The heat treatment process in Welspun TMT Rebar's eliminates all these undesirable effects. thus higher strength is attained even with lower carbon content and they also have excellent ductility, outstanding bend ability and superior weld ability.
The low temperature rolling further enhance the quality of welspun TMT Rebars by way of higher strength .
Besides this because of tension free rolling close tolerance are possible and uniform quality of the product of the product is guaranteed.
Further more Welspun TMT Rebars facilities ensure easy handling and eliminates any damage to the product. |
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| Key Features |
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Lower carbon content and made from fully killed steel |
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High yield strength, higher tensile strength, higher elongation percentage in comparison to cold twisted bars of the same grade |
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Easy bend ability, weld ability and excellent ductility ensure economy and safety of use |
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In-built ability to resist loss of strength at higher temperatures |
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Requires less energy for bending and re-bending along with superior reverse bending properties |
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Can be butt-welded or lap-welded |
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Use of fe-500 grade reduces steel consumption upto 15% in comparison to cold twisted
bars |
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Ideally suited for any type of concrete structure |
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EVO-TECH Technology |
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