• Difference Between Fe 500 and Fe 500 D TMT bars: All you need to know

    April 25, 2024 | By Kenza TMT Steel Bars

    Ever since TMT Steel Bars were created, they have become an indispensable part of the construction industry. This is because of the superior quality they gain as a result of going through a specialized process including strength, ductility, and resistance to corrosion. This provides the necessary strength to construct sound structures like erect buildings, bridges, and many more structures that have built up the modern urban landscape.

    Steel bars come in different grades that vary in strength and ductility. Each one of them is ideal for different kinds of structures. Among the myriad of steel bars available, Fe 500 and Fe 500D bars are known for their strength and durability. Let us look into them in detail.

    What is Fe 500?

    The Fe in Fe 500 stands for iron and the number 500 denotes its minimal yield strength. In this case, its minimum stress in Newton per square millimeter (N/mm²).  This means that these bars have a yield strength of 500 N/mm², which is quite strong and used in residential, commercial, and industrial structures.

    What is Fe 500D?

    Now in Fe 500D, the D imparts a new dimension to TMT bars. The D here signifies ductility i.e. elongation property. As a result, 500 D offers flexibility and resilience that is more enhanced than conventional  Fe 500. It makes 500 D ideal for structural applications that are subjected to dynamic loads and seismic activity. Dynamic loads are those that change over time. In such cases, the loads apply forces frequently that are significantly larger than the static forces. The elongation property allows 500 D TMT Steel bars to deform under stress without breaking or compromising their structural integrity. The enhanced ductility of Fe 500D also makes it an ideal choice for being used in buildings, bridges, and other structures in earthquake-prone areas.

    Fe 500 vs Fe 500D

    Although the Fe 500 and Fe 500D differences are not much, there are certain distinct features that set the two apart. Take a look into how they are different from each other.


    Just like all other TMT Steel bars, Fe 500 are also manufactured by heating steel billets and then swiftly quenched and tempered. The manufacturing process of Fe 500D involves additional and stringent steps and controls to ensure that they have the desired combination of strength, ductility, and other properties.

    Strength and Composition

    Just like we mentioned above Fe 500 has a yield strength of 500 N/mm² with a standard composition of iron and some alloys. Fe 500 D TMT bars have a higher elongation capacity that is achieved through more optimized chemical compositions and specialized metallurgical processing.

    Usage and Applications

    While Fe 500 is widely utilized in general construction projects from residential buildings to commercial complexes and infrastructure developments, Fe 500 D is the choice of TMT Steel bars for structures that require higher ductility and resilience. These structures include structures like earthquake-resistant buildings, high-rise constructions, and projects located in seismic zones.

    Cost and Availability

    Fe 500 is a standard grade TMT Steel Bar and they are usually readily available. They also cost less compared to the specialized variants. On the other hand, Fe 500 D bars might not be that easily available and can come at a higher price than Fe 500.

    Chemical Composition:

    Fe 500 TMT Steel Bars are composed of higher percentages of carbon, sulfur, and phosphorus while Fe 500D has lower percentages of these elements giving it improved flexibility, resistance to temperature fluctuations, and enhanced durability.

    To sum it up

    TMT Steel Bars are more than just construction materials. They have become a symbol of strength, resilience, and reliability in the industry. While Fe 500 is easily available and provides a standard load-bearing capacity, Fe 500 D TMT Steel bars take it to another level with its enhanced ductility and flexibility. Anyone looking for quality TMT steel bars needs to understand the difference between the different grades and what they are ideal for to make informed decisions before choosing the best TMT bars for their specific requirements. It is always good to consult with the best TMT bar manufacturer in Kerala before you choose.


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