What Are the Different Grades of TMT Bars?

What Are the Different Grades of TMT Bars?

Published Date: 28 July, 2023
Updated On: 07 June, 2024
Table of Content

TMT Bar Grades Evolution: Fe 415 to Fe 600

TMT bars were introduced in 1979 under IS 1785:1979 and were available in grades Fe 415 and Fe 450. In 1985, a better quality of these bars called Fe 500 (IS 1786:1985) hit the market. Since then, the Indian construction industry has only increased its demand for various types of TMT bars. Therefore, in 2008, Fe 600 grade TMT bars that met IS 1786:2008 were put on the market.

What is Fe?

The short form Fe stands for ferrous material, such as Iron, used to make reinforcement steel bars. Steel’s yield strength is indicated by the number 415, which is 415 N/mm2. Fundamentally, Fe 415 is one of the types of TMT bars used in constructing RCC constructions. While Fe 500 exhibits an extension of about 10%, this type indicates a prolongation of almost 14%.  For example, use Fe 415 rather than Fe 500 for any structure in a seismic zone. This reinforced preparation is comprised of Cold Twisted and Deformed (CTD), or Cold Worked High Yield Strength Deformed, to achieve High Strength. Fe 415 and Fe 500 are the usual steels. Fe suggests an Iron component in types of TMT bars

What are the Different Types of TMT Bars?

Currently, there are too many TMT grades in the market. Therefore, Fe 415 TMT bars became the most often used grade of steel bar while building homes. In India, TMT bars were introduced between 1980 and 1985. 

Types of TMT bars popular in India are Fe415Fe500Fe550 , and Fe 600. We can acquire different steel grades with varying qualities by slightly altering the treatment cycle.

Various types of TMT bars are frequently used in civil construction projects, such as those involving building beams, slabs, columns, and other structures. They are the foundational strength of every construction and must support tremendous loads. 

What are the Different Types of TMT Bars

  1. Fe 415

Fe 415 TMT is utilized for small-scale construction projects because it is pliable and cost-effective. In addition, because they can be twisted into the most intricate shapes, they are ideal for minor load installations.

Uses: To strengthen small-scale constructions, houses, and residential buildings. These bars can be employed in earthquake-prone areas thanks to their uniform elongation property.

  1. Fe 500

Fe 500 grade is considered the industry standard in many construction projects. Fe500D and Fe500S are two types of steel bars of Fe500 that are well-liked options that provide more robust seismic stability and flexibility.

Uses: Fe500 bars are suitable for usage in various multi-story, commercial, and residential constructions. They are more ductile and have more tensile strength than Fe415, which is explicitly made to be more load-resistant and stabilize high-rise constructions.

  1. Fe500D

These bars are comparable to the Fe500 grade, except the letter “D” stands for flexibility. Compared to typical Fe500 grade bars, these have more flexibility. 

Uses: These bars are perfect for dealing with cyclones, tsunamis, and other natural calamities. In addition, Fe500D TMT bars are suitable for areas with high seismic movement due to their excellent security features.

  1. Fe550

Fe 550 grade bars can be used in various large-scale projects because of their increased tensile strength.

Uses: These are employed in constructing industrial and large-format infrastructure projects, including bridges, businesses, and buildings with heavy load-bearing requirements. These bars are ubiquitous in subterranean, marine, and coastal settings.

  1. Fe 550D

Fe550 bars are more malleable than Fe550 bars, similar to Fe500D grade bars. However, the low carbon content of these bars also contributes to their excellent weldability.

Uses: In locations where Fe550 grade bars are utilized but also in areas with a high risk of natural disasters, Fe550D bars are used instead.

  1. Fe 600

One of the most solid TMT grades, Fe 600, is used to develop demanding foundation constructions, spans, marine offices, and other structures. They ensure less steel blockage inside the reinforcement, provide excellent elasticity, and minimize total usage.

Uses: Expressways, metro projects, towers, commercial complexes, and industrial zones all use Fe 600. They are widely used for many applications where load-bearing, solidity, and corrosion resistance are prioritized.

SML Brings you the Best Type of TMT Bars

Sree Metaliks Limited, established in 1995, has built a solid reputation in the construction sector. Their raw materials span a wide range, including Iron OreSponge IronBilletsPig IronPellets, and TMT bars. High-quality TMT bars made by Sree Metaliks Limited are employed in several construction projects.

Sree Metaliks Limited produces different types of TMT bars that adhere to high international standards. Therefore, Thermax Quenching System & Technology of Henningsdorfer Stahl Engineering, GMBG, Germany, has granted them a license. This license serves as a gauge for power and adaptability. 

With the help of specialists, Sree Metaliks Limited creates the best type of TMT bars for building. The TMT bars are manufactured at its cutting-edge facility in Loidapada, Odisha. Additionally, Sree Metaliks TMT bars are fully compliant with the BIS standard.

Read more: TMT Bars Specifications – The Difference Between Fe500 & Fe500d TMT Bars


1. Which grade of TMT is best?

The choice of the best grade of TMT bars depends on the specific requirements of a construction project. Common TMT bar grades include Fe415, Fe500, and Fe550, indicating the yield strength in megapascals. For general construction purposes, the Fe500 grade is widely used due to its balanced strength and cost-effectiveness. Fe550 grade is preferred for projects requiring higher strength, while Fe415 may be suitable for lighter structures. Ultimately, the selection should align with the structural specifications and engineering needs of the construction, ensuring optimal performance and safety in the built environment.

2. Which is better: TMT 500D or 550D?

Amongst various types of TMT bars, the choice between TMT 500D and 550D depends on the specific structural requirements of a construction project. TMT 550D offers a higher yield strength compared to TMT 500D, providing increased structural stability and load-bearing capacity. It is suitable for projects demanding enhanced strength, such as high-rise buildings and heavy infrastructure. However, TMT 550D may come at a higher cost. TMT 500D, with slightly lower strength, is a more economical option and is commonly used in a variety of construction applications. The decision should be based on a careful assessment of project needs, considering factors like load-bearing capacity, budget constraints, and engineering specifications.

3. How do I choose TMT bars?

Choosing the right TMT bars involves considering factors such as grade, strength, ductility, and corrosion resistance. Identify the specific requirements of your construction project, including the type of structure, load-bearing capacity, and environmental conditions. From different types of TMT bars, select a TMT bar grade that aligns with these needs—Fe500 grade for general construction and Fe550 grade for higher strength requirements. Ensure the bars meet national or international standards. Look for reputable manufacturers with a history of producing quality TMT bars. Consulting with structural engineers and adhering to local building codes will guide you in choosing TMT bars that ensure the structural integrity and longevity of your construction.

4. Which grade is best for house construction?

For house construction, Fe500 is often considered the best grade of TMT bars. It provides a balanced combination of strength and cost-effectiveness, making it suitable for various residential structures. The Fe500 grade ensures the structural integrity of the building while offering economic advantages, making it a popular choice in the construction of houses and smaller buildings.

5. What is HYSD steel used for?

High Yield Strength Deformed (HYSD) steel is commonly used in construction for reinforcing concrete structures. Its unique properties, such as high tensile strength, ductility, and weldability, make it ideal for applications where strength and durability are crucial. HYSD steel is employed in various construction projects, including buildings, bridges, dams, and other infrastructure. It enhances the structural integrity of concrete, providing the necessary reinforcement to withstand different loads and environmental conditions.

6. Which is better, HYSD or TMT?

The choice between HYSD (High Yield Strength Deformed) and TMT (Thermo-Mechanically Treated) steel depends on the specific requirements of a construction project. TMT bars are generally considered a modern and superior alternative due to their unique manufacturing process, offering enhanced strength, ductility, and corrosion resistance. TMT bars are widely used for their improved properties and are often preferred over traditional HYSD steel in contemporary construction applications. The decision should align with the project’s structural needs and construction standards.