Steel has been an essential component of all sorts of buildings for decades. It strengthens the concrete and protects the construction structure against corrosion and other natural disasters.
There are several varieties of steel bars. The kind of steel bars vary based on region and climate. Until the 1990s, TOR steel was widely utilised. Later, TMT bars' greater ductility and other properties rapidly eliminated TOR steel from the market.
The Luxembourg-based "Toristeg Steel Corporation" is known by its brand name, TOR. One of the finest steel grades for concrete reinforcements for a short while was TOR steel. Made from low-carbon mild steel billets, TOR steel has a higher tensile stress and a high elasticity value due to surface deformation caused by the steel twisting after elongation. This led to residual tension, which made TOR steel more vulnerable to corrosion.
Thermo-Mechanically Treated, or TMT, Bar. A high-strength reinforcing bar with a soft inner core and a robust outer core is how it is characterised. TMT bars have been shown to be incredibly practical for reinforcing concrete constructions ever since they were first introduced. It is also renowned for having a strong, robust construction, robust look, and great strength. According to the ISO Code, they are also resistant to corrosion because of their chemical makeup. These days, TMT bars are frequently employed as a tensioning tool to strengthen concrete and increase its resistance to compressive stresses.
It is best to use TMT (Thermo-Mechanically Treated) steel bars for constructing earthquake-resistant buildings. They not only provide the ideal balance between hardness and flexibility (elongation), but also aid in reducing the impacts of damages during any seismic activity.
Feature |
TMT Bars |
TOR Steel |
Tensile Strength |
Higher yield strength; uses less steel |
Requires 20% more steel for comparable strength |
Ductility |
Superior; provides 20% extra building strength |
Less ductile; offers lesser building strength |
Elongation |
Higher elongation; ensures flexible structures |
Lower elongation; less flexibility |
Bendability |
Highly bendable; minimal risk of breakage |
Good bendability; prone to re-bend breakage |
Weldability |
Highly weldable; low carbon content |
Less weldable; higher carbon content |
Durability |
Resistant to corrosion; stays unaffected by water |
Vulnerable to corrosion; susceptible to water damage |
Seismic-Resistant |
Intrinsically strong; absorbs more energy during calamities |
Softens over time; less resilient to seismic activity |
Rust Resistant |
Highly rust and corrosion-resistant |
Corrodes easily due to chloride ions |
Fire-Resistant |
Retains strength at high temperatures |
Low thermal stability; susceptible to fire damage |
Flexibility |
Extremely flexible; endures high temperature and humidity |
Prone to cracking and breaking under stress |
Bonding |
Superior bonding with cement; ensures strong structure |
Weaker bonding; is less reliable in forming strong structures |
Affordability |
More affordable due to less processing requirements |
Costlier due to additional hardening processes |
Climate Suitability |
Ideal for hot and humid climates; resistant to rust and corrosion |
Vulnerable to rust and corrosion in humid conditions |
Overall Superiority |
Offers superior strength, durability, and flexibility |
Less superior in strength, durability, and flexibility |
TMT bars are nearly perfect in every way compared to TOR steel. TMT bars exhibit superior strength, ductility, weldability, durability, earthquake resistance, corrosion resistance, fire resistance, flexibility, and cement bonding. They are also better for the Indian climate and more affordable.
The market offers TMT bars in a variety of grades. The TMT bars are better the higher the grade. According to IS Standards, Fe 550D Grade TMT Bars provide the ideal ratio of strength to flexibility in this instance. Therefore, it is advised for all kinds of building needs.
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