TMT, HYSD and TOR steel bars are hugely popular in the construction industry. Although all of them undergo thermal and mechanical treatments during their manufacturing, the fundamental difference between these three bars lies in the exact method of production. Let’s understand the difference between these three bars in more detail.
TMT bars: TMT is short for Thermo Mechanically Treated bars. These are reinforcement bars known for their high strength. The characteristic feature of these bars is a soft inner core wrapped in a hardened outer surface. They take their name from the process of manufacture, called thermo mechanical treatment, where hot steel billets are passed through cold water. This technique hardens the outer surface, enhancing its tensile strength, while the core remains at a higher temperature and increases in ductility. This alteration in microstructure across the bar’s cross-section imparts enormous strength to it. Moreover, TMT bars don’t go through any deformation or twisting processes, hence their surface is free from cracks and many more defects.
HYSD: HYSD, or High Yielding Strength Deformed Steel, goes through heat treatments much like TMT bars, but the steps following this are completely different. Subsequent to the heat treatment procedure, the heated rods are shaped through heat rolling or cold twisting. Thus HYSD rods are also subjected to various kinds of mechanical and thermal treatments.
TOR: TOR is actually the abbreviation of a steel corporation in Luxembourg, which has become synonymous with CTD, short form of Cold Twisted Deformed steel. TOR is basically a type of HYSD steel, which undergoes cold twisting and deformation following the heat treatment. TOR rods have surface deformations, which are made after putting the rod through an elongation process. The deformations provide better bondage with concrete, while elongation of rod improves the yield strength. Owing to the surface deformations, slippage in concrete is minimized and the two materials adhere more strongly.
Both TMT and TOR steel bars are high in strength, but TMT bars are still considerably stronger. Due to their superior strength and high-resistance to corrosion, TMT bars are the number one preference for coastal construction, where extreme humidity is a big problem. TOR is a good general purpose steel bar.
Top 3 Reasons to Pick TMT bars over TOR and HYSD steel bars:
TMT bars are devoid of torsional stress as they aren’t put through any physical deformations. Hence, chances of surface defects are almost negligible.
Reduction in surface defects means that TMT bars are less prone to harmful oxidation, like corrosion, in comparison to HYSD bars.
TMT bars are more affordable. This is because they don’t go through additional hardening processes; water quenching methods harden TMT bar sufficiently. This reduces energy as well as money spent on deformation processes, thereby boosting its affordability. Moreover, TMT bars use 8-11% less steel compared to HYSD bars, further improving their affordability.
After this read, it is obvious that customers will benefit in the long-term by opting for TMT bars over other types of steel bars. Looking for the best TMT bars in India? Get in touch with MSP Steel – one of the leading steel manufacturing companies of our country.