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WHY GYAN TMT IS BETTER?

GYAN TMT bars are produced with global Turbo Quench Technology from GERMANY. It conforms to all National and International standards. The Best combination of chemical & physical properties is the main characteristic of GYAN TMT. Strict Quality Control is maintained at each level of production.

GYAN TMT bars are of uniform strength, elongation and enhanced ductility that is far in excess of minimum limits specified in the standard IS:1786:2008. As per the IS:1786:2008 and practically used by designers bars require minimum yield strength of 415 N/mm2. However GYAN TMT bars possess typical yield strength as high as 425 N/mm2. Further as per standard IS:1786:2008 ductility as measured elongation is specified to be 14.5 % which is tested to be 17 % in case of GYAN TMT. Hence the bars produced with international technology are much better than traditional cold twisted bars.

Mechanical properties

Indian Standards (IS:1786)

American Standards (ASTM A 6s15)

European Standards
(DIN 488)

GYAN TMT Standards
Grade

Fe 415

60 (420)

Bst- 420 S

 
Proof stress in N/mm2

415

420

420

425
Tensile strength in N/mm2

485

500

500

490
Elongation in %

14.5

14 10 17
Bend Test

Up to 22 mm -3D

10 to 16 mm - 4D 6 to 25 mm  -4D 4D
Grade

Fe-500

75 (520) Bst-500 S  
Proof stress in N/mm2

500

520 500 525
Tensile strength in N/mm2

545

620 550 620
Elongation in %

12

9 10 15
Bend Test

Up to 22 mm -4D

10 to 25 mm -4D 6 to 25 mm -5D 4D
Grade

Fe-550

90(570) Bst-500-m  
Proof stress in N/mm2

550

570

500 570
Tensile strength in N/mm2

585

570 550 690
Elongation in %

8

7 8 10
Bend Test

Up to 22 mm -5D

10 to 25 mm -5D 6D 5D


 

 

THE PRODUCTION PROCEDURE

 

1. MELTING
During this process proper mixture of Sponge, Pig Iron & other allied raw material are fed into the furnace and chemicals are added to the molten metal to refine the same and achieve the desired chemical composition of Steel Billets. The Chemical Tests are done during and after the process, to make ensure the quality and purity of Steel Billets.

2. REHEATING AND ROLLING
Steel Billets are then heated in a pusher type oil fired reheating furnace at a temperature of 1200C. The heated Steel Billets are then rolled through a series of mill stands, which progressively reduce the billets to the final size and shape of reinforcing bars at the final mill stand.

3. QUENCHING
As soon as the bar leaves the final mill stand, it is rapidly and vigorously cooled from 900C to the optimal temperature. It is done in a completely automated quenching box made with Turbo Quench technology from GERMANY, where the product undergoes a uniform surface hardening treatment to form a hardcore martensitic layer, which provides the steel its strength along with adhesive layering.

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

5. ATMOSPHERIC COOLING
The last stage takes place while the product lies on the cooling bed where the bar is subjected to normal air-cooling reduced to ambient temperature. The austenitic core is then transformed to a ductile ferrite-pearlite core. Thus, the final structure consists of a combination of strong outer layer of tempered Martensite and a ductile core of ferrite-pearlite.
 

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