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Mild Steel has low carbon content, accordingly, it is more workable & has less yield strength Fy= Mpa, HYSD, stands for high yield strength deformed bars Fy=- . TMT: Thermo Mechanically Treated or TMT bars are high-strength HYSD steel also undergoes heat treatment similar to TMT bars, but the. These are also known as HYSD bars. They have higher percentage of carbon as compared to mild steel. Their strength is higher than that of.

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Thermo Mechanically Treated or TMT bars are high-strength reinforcement bars having a hardened outer core and a soft inner core.

What is the difference between mild steel and HYSD bars? – Spécialités

They are manufactured under a process called Thermo Mechanical Treatment, after which they are named. They are manufactured by passing hot rolled steel billets through water, which hardens the surface and increases its tensile strength while the inner core stays at a comparatively warmer temperature and hence, hyd core becomes more ductile.

This variation in the microstructure of the cross-section of the bar provides huge strength to the bar.

Since there are no twisting or deformation processes employed in this method, TMT bars have no surface cracks or other defects as well.

In this type of steel, after undergoing the heat treatment process, the hot steel rods are either heat rolled or hyse twisted for shaping, thus making them both thermally and mechanically treated.


It is a form of HYSD steel, where the steel bars, after undergoing the mandatory heat treatment process, are cold twisted and deformed.

These deformations are present on the surface and are done after an elongation process, which imparts higher yield strength to steel and the surface deformations impart higher bondage with concrete. Because of the deformations, these bars minimize slippage in concrete and increases the bond between the two materials. Deformed bars have a higher tensile strength than that of MS steel bars and the deformations should be uniformly spaced along yhsd length the bar.

Bas, due to the superiority in the strength of TMT bars and also because of its higher corrosive resistance, TMT bars are better suited for use in large concrete structures and concrete structures built on the coastlines where high humidity is a major issue.

On the flipside of the coin, TOR bars are general purpose steel bars used in buildings, roads, and bridges as they surpass the minimum strength requirements.

What is the difference between mild steel and hysd bars? – Specialties

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. As TMT bars do not undergo any physical deformation twistingno torsional stress occurs which removes the chances of surface defects in TMT bars.

Due to the reduced amount of surface defects in TMT bars as compared to HYSD steel, they are comparatively much less susceptible to the harmful effects of oxidation like corrosion. TMT bars do bar require explicit hardening as the hardening process is conveniently achieved by the water quenching process, thus reducing the energy and expenditure required for physically deforming the steel bars, and hence increasing their affordability.


What is the difference between mild steel and HYSD bars?

Due to the amazing flexibility and durability exhibited by TMT bars, they can be used for a wide range of construction works and is basically one of the barrs reasons why construction workers rely a lot more on TMT bars as compared to HYSD steel bars.

As TMT bars have a uniform and hardened periphery and a considerably softer core, this kind of bars will have the desired tensile strengths coupled with high elongation and ductility as required in the construction of buildings located in areas with regular seismic activity.

TMT hyed provide a longer life to the structures where they are used. The TMT steel inside the concrete does not react with the moisture in the surroundings. This reaction when allowed to occur results in the formation of rust which acts like bzrs and results in cracks in the concrete, thus weakening the structure and subsequently shortening the lifespan of structures and buildings.

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