Group Companies :

TMT Rebars
Sponge Iron
Ingots / Billets
 
Introduction
Stages
Quality
Key Features
Range of TMT Rebars
 
 
Introduction :
Welspun power & Steel limited (WPSL), a part of the US $ 3000 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.
 
 
Stages :
STAGE 1
STAGE 2
STAGE 1
The process utilizes residual heat from the rolling process to attain the desired mechanical properties. Ingots / billets, 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 “Martensitic 'structure,  while the core remains “Austenitic'
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'. 

 

STAGE 3

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.

 
 
Quality :

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.

 

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 is possible and uniform quality of the product of the product is guaranteed.

 

Further more Welspun TMT Rebars facilities ensure easy and safe handling and eliminates any damage to the product.
 
 
Key Features :
Lower carbon content and made from fully killed steel
High yield strength, higher tensile strength, higher elongation percentage in comparison to cold twisted bars of the same grade
Easy bend ability, weld ability and excellent ductility ensure economy and safety of use
In-built ability to resist loss of strength at higher temperatures
Requires less energy for bending and re-bending along with superior reverse bending properties
Can be butt-welded or lap-welded
Use of fe-550 D grade reduces steel consumption upto 15% in comparison to cold twisted bars
Ideally suited for any type of concrete structure
EVO-TECH Technology
 
 
Range of TMT Rebars :
SIZE RANGE OF WELSPUN TMT BARS
SIZE NOMINAL DIA
25 mm SECTIONAL WT. (R28mmange) kg/m32
8mm
0.376 - 0.420
10mm
0.592 - 0.636
12mm
0.852 - 0.915
16mm
1.517 - 1.627
20mm
2.371 - 2.544
25mm
3.696 - 3.927
28mm  
4.646 - 4.937
32mm
6.060 - 6.440
 
 
We also make 36mm and 40mm TMT
 
 
 
 

welspunsteel.com © 2012