TMT vs HYSD Whats the Difference in Steel for Construction
When it comes to construction, not all steel bars are created equal. Two commonly heard terms — TMT and HYSD — often confuse buyers.
Here’s a clear breakdown of their differences.
? What is HYSD?
HYSD (High Yield Strength Deformed) bars are:
Cold twisted and deformed steel bars
Introduced before TMT as an upgrade over plain mild steel
Known for ribbed surface (for grip) and better yield strength (Fe415, Fe500)
However, they have drawbacks:
Surface stress due to twisting
Prone to corrosion and reduced ductility over time
? What is TMT?
TMT (Thermo Mechanically Treated) bars are:
Produced using QST (Quenching & Self Tempering) process
Soft on the core, hard on the surface
Superior in strength, ductility, and corrosion resistance
? Side-by-Side Comparison
| Property | HYSD | TMT |
|---|---|---|
| Strength | High | Higher |
| Ductility | Low | High |
| Corrosion Resistance | Poor | Excellent |
| Earthquake Resistance | Moderate | High |
| Fire Resistance | Moderate | Excellent |
| Cost | Slightly cheaper | More value for long-term safety |
✅ Conclusion: TMT is the evolved version of HYSD — safer, stronger, and more durable.
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