Shyam TMT Re-Bars are hot rolled from steel billets and subjected to on-line thermo mechanical treatment in three successive stages:

• Quenching
   
• Self Tempering
   
• Atmospheric Cooling

Quenching: The hot rolled bar from the continuous mill stand enters the "Thermex system" and is rapidly quenched by a special water spray system. This rapid quenching hardens the surface of the SHYAM TMT Re-Bars to a depth optimised for each section, forming a martensitic rim while the core remains hot & austenitic.

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Self-Tempering: When Shyam TMT Re-Bars leave the quenching box, the core remains hot compared to the surface allowing heat to flow from the core to surface causing tempering of the outer martensitic layer thus forming a structure called “Tempered Martensite”. The core still remains austenitic at this stage.

Atmospheric Cooling: This takes place on the cooling bed, where the austenitic core is transformed into ductile Ferrite-Pearlite structure. The final structure consists of stronger outer layer (Tempered Martensite) with ductile core (Ferrite-Pearlite). This gives Shyam TMT its unique combination of high strength & high ductility.

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