Gyan TMT, Manufacturers of TMT Steel Bars,TMT Steel Bar manufacturer,Steel Bars wholesale,TMT Steel Bars suppliers,TMT Bars, Mandi Gobindgarh, Punjab, India

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 1200^�C. 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 900^�C 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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