What are the pros of TMT bars over HYSD and mild steel?

 

TMT bars or Thermo-Mechanically Treated bars are high-strength reinforcement bars having a tough outer core and a soft inner core. The very first step of the manufacturing process involves passing the steel wires through a rolling mill stand. HYSD stands for High Yielding Strength Deformed Steel. In the case of HYSD steel, steel bars, after undergoing the mandatory heat treatment process, are cold twisted and deformed. Mild steel is a type of carbon steel with a low amount of carbon – it is actually also known as “low carbon steel.” 



TMT bars are more reliable for construction purposes than HYSD and mild steel, because:

  • During the cooling process, TMT Bars turn into the ferrite-pearlite structure for which it is highly ductile.
  • In HYSD Bars residual stress is high and tensile strength is low that causes deformation. In TMT Bars residual stress is low and tensile strength is high for which it does not undergo any deformation.
  • TMT Bars can bend and rebend as per construction requirements. In HYSD torsional stress occurs during bending that causes surface defects.
  • TMT Bars consume up to 17% to 20% less amount of steel than HYSD Bars.
  • Lighter in weight, Transportation cost is low.
  • Due to the low intake of carbon, sulfur & phosphorus, TMT Bars are highly resistant to corrosion.
  • TMT Bars are Earthquake Resistant.
  • As per IS Standards Fe 500d Grade TMT Bar has the best combination of strength & ductility and that Fe 500d Grade TMT Bar is most recommended for all types of construction purposes.

 


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