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TMT Steel Bar Grade | Adukia Industries
May 2023

Types of TMT steel bar grades and their applications

The majority of modern structures get their strength from TMT bars. From dams to residential buildings, TMT steel bars are preeminent material for construction. So, if you are in search for the best TMT bar in Kolkata, the first and foremost thing is to understand the different grades of the TMT bar and their applications. The following information will help you avoid being subjected to fraudulent practices.

TMT steel bars are available in various kinds of physical properties and chemical compositions that account for diverse usage in construction. In this blog, we will discuss the variety of TMT steel bar grades along with their applications.

Different types of TMT steel bar grades

Fe-415, Fe-500, Fe-500D, Fe 550D and Fe-600 are the five types of TMT steel bar grades that most TMT bar manufacturing companies in India offer. The grade of TMT bars indicates their strength and rigidity factors. The number defines the minimum yield strength of a bar, and the letters with the number represent the elongation properties.

TMT Bar Grade | Adukia

Fe-415 TMT bar

Fe-415 is commonly used for small-scale constructions such as houses and residential projects. These TMT bars have uniform elongation that makes them resistant to earthquakes, hence they make the perfect choice for resisting damage from natural calamities.

The chemical composition of Fe-415 is; Carbon- 0.30%, Sulphur- 0.06%, Phosphorus- 0.06%, and S+P- 0.110%. The mechanical properties of the Fe 415 grade bar are minimum yield strength of 415N/, along with an elongation of 14.5%.

These TMT bars are appropriate for low-load construction in earthquake-prone areas. Apart from that, these are just the right fit for small-scale structures.

Fe-500 TMT bar

Fe-500 is one of the most versatile TMT bar grades, which finds its application in small-scale and large-scale constructions. These TMT bars offer good strength and ductility at the same time, making them a perfect combination for construction.

The chemical composition of Fe-500 TMT bar is as follows; Carbon- 0.30%, Sulphur- 0.055%, Phosphorus- 0.055%, and S+P- 0.105%. With this chemical composition, you get a minimum yield strength of 500N/ and 12% elongation properties.

The application of the Fe-500 TMT bar lies in residential, commercial, and multi-story buildings. The other variation of Fe-500 TMT is Fe-500S, and Fe-500D. These bars have great tensile strength and high resistance to corrosion. As these bars have a great minimum elongation percentage and high ductility, these are ideal choices for underground construction and construction in high seismic activity areas.

Fe-550 TMT bar

Fe-550 TMT bars have high yield strength with specifications to ensure maximum savings on steel consumption. It has a minimum yield strength of 550N/ and tensile strength of 585 N/

The chemical composition of Fe-550 TMT consists of; Carbon- 0.30%, Sulphur- 0.055%, Phosphorus- 0.050%, S+P- 0.100%, Manganese- 0.50%, Carbon Equivalent- 0.42%. With this chemical composition, these bars are extensively used by marine and bridge construction companies.

Fe-550D TMT bar

With a significant difference in the properties, the Fe-550D TMT bars are different from Fe-550 bars. The “D” in these TMTs stand for high ductility, which gives the Fe-550D TMT bars an upper hand in absorbing energy.

Manufactured using special technology termed direct quenching, the Fe-550D TMT bars are cooled after the final rolling stage. At Adukia Industries, we offer Ultramax Fe-550D TMT Bars that have minimum yield strength of 570N/ and ultimate tensile strength of 630N/, and an elongation of 20%.

The high ductility and elongation properties in these TMT bars make them the perfect choice for high seismic areas, as well as in areas that need high-stress endurance. High-rise buildings, bridges and flyovers, industrial sheds, dams, and transmission towers are some other areas of application.

Fe-600 TMT bar

Fe-600 TMT bars are known for their premium value and ultra-strength properties. These bars are designed to gracefully support the growing infrastructure and thrive in the seismic sensitive zone. As the yield quality is highest in Fe-600 TMT bars, the area or the steel required will be a lot lesser.

The chemical composition of Fe-600 TMT consists of; Carbon- 0.30%, Sulphur- 0.04%, Phosphorus- 0.04%, and S+P- 0.075%. The chemical composition ensures the load-bearing capacity and strength of the TMT bar grade.
These TMT bars are used for construction in mechanical zones, business properties, towers, plants, metro ventures, freeways, and more.


Adukia Industries is pioneering the manufacturing of TMT bars. With over 50 years of experience, we offer a range of the best TMT bar in Kolkata that consumers can rely on. Depending on the specific needs and requirements, one can select any of the TMT bar grades mentioned in the blog.


01 May


18 December

Very impressive and informative post. keep up the good work and help Eastern India

23 August

எமக்கு விற்பணை செய்ய விருப்பம்

Jatin Gupta
08 August

Thanks for the nice sharing.


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