Your Guide To Different Types of TMT Bars and Their Uses in Construction

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TMT Bars

A good understanding of the different grades of TMT bars in very important while sourcing the right TMT bars for your project. Different projects may call for different types of tmt bars, depending on the compositional strength, dimensions, and features they offer. For example, an Fe415 differs significantly from an Fe500 not only in yield strength & composition, but also in utilization and on-site application.

Understanding TMT grades
TMT steel is available in multiple variations, being used by construction and infrastructure firms across residential, commercial and industrial projects. The procurement of the right grade of TMT enables procurement managers to leverage standardization, strength and durability within the project.

The Bureau of Indian Standards grades TMT steel bars as per their chemical composition and mechanical properties. Indian manufacturers of steel comply with the standards referenced, while providing additional information about the bar’s ductility, weldability, corrosion resistance, etc.

Procurement managers can review the Fe grade reading, along with the TMT bar price, to understand the effectiveness of the bar acquired. TMT bars are graded in accordance with how much yield stress they can safely withstand, in Newtons per square millimetres, without exhibiting permanent deformation. i.e. an Fe500 grade will provide a yield strength of 500 N/mm2, beyond which it may not be able to maintain its form.

TMT bars can also be acquired in a range of sizes from 8 mm in diameter to 32 mm. Project managers can refer IS 1786-2008 standards when comparing different TMT manufacturers for optimal procurement.

Types of TMT bars and their uses
Procurement managers can map out core requirements and source the right TMT type with the key properties necessary for long-term reinforcement. There are 4 main grades that most TMT bars fall under, namely Fe 415, 500, 550, & 600, making it easier for buyers when sourcing the right TMT bar.

Procurement managers can also review any additional information provided such as superior corrosion resistance, seismic resistance, bendability, etc., when analysing the types of TMT bars available. Listed below are the different TMT grades available and what construction projects they’re used for extensively.

(As per Amend No.1 to IS 1786: 2008 – Bureau of Indian Standards)

Fe 415 grade
Fe 415 TMT is a highly cost-effective and ductile reinforcement bar which is manufactured for small-scale construction projects. It can be easily bent into the most complex shapes, making it perfect for small-load constructions.

Chemical composition (% max)

  • Carbon – 0.30
  • Sulphur – 0.06
  • Phosphorous – 0.06
  • S+P – 0.110

Mechanical properties

  • Minimum Yield Strength – 415 N/sq.mm
  • Ultimate Tensile Strength – 485N/sq.mm
  • Elongation (%) – 14.5
  • Ration (UTS/YS) – ≥ 1.10

Use in construction

Fe415 is used for reinforcing residential homes, houses, and small-scale structures. They have high uniform elongation and can be used to develop projects in earthquake-prone regions. Construction firms may also opt for Fe415S or Fe415D if they require additional seismic stability or ductility.

Fe 500 grade
The Fe500 grade is generally regarded as a market-standard across many construction projects. Its alternatives, Fe 500D and Fe 500S, are also popular choices that offer greater seismic stability and ductility.

Chemical composition (% max)

  • Carbon – 0.30
  • Sulphur- 0.055
  • Phosphorous – 0.055
  • S+P – 0.105

Mechanical properties

  • Minimum Yield Strength – 500 N/sq.mm
  • Ultimate Tensile Strength – 545N/sq.mm
  • Elongation (%) – 12
  • Ration (UTS/YS) – ≥ 1.08

Use in construction

Fe 500 bars can be used across a range of residential, commercial and multi-storey projects. They offer greater tensile strength than Fe 415 and are specially manufactured to provide stability to high-rise projects, while resisting load better.

Additionally, Fe 500D bars offer greater ductility, making them perfect for construction in areas with high seismic activity and sudden loads. They have a superior minimum percentage elongation of 16%, compared to that of Fe 500’s at a standard 12%.

Fe 550 grade
Fe 550 grade bars have greater tensile strength and can be used across a range of large-scale projects.

Chemical composition (% max)

  • Carbon – 0.30
  • Sulphur – 0.055
  • Phosphorous – 0.050
  • S+P – 0.100

Mechanical properties

  • Minimum Yield Strength – 550 N/sq.mm
  • Ultimate Tensile Strength – 585N/sq.mm
  • Elongation (%) – 10
  • Ration (UTS/YS)- ≥ 1.06

Use in construction

Construction procurement managers can source Fe 550 grade TMT when developing industrial and large-format infrastructure projects.  Bridges, industrial projects, and structures requiring high load-bearing capacities can leverage Fe 550 grade TMT. They’re especially impactful in coastal, marine and underground environments as well.

Fe 600 grade
Fe 600 is one of the strongest TMT grades that construction firms can acquire while developing heavy-duty infrastructure projects, bridges, marine facilities, etc. They offer greater tensile strength, reduce overall consumption, and ensure lesser steel congestion within the reinforcement.

Chemical composition (% max)

  • Carbon – 0.30
  • Sulphur- 0.04
  • Phosphorous – 0.04
  • S+P – 0.075

Mechanical properties

  • Minimum Yield Strength – 600 N/sq.mm
  • Ultimate Tensile Strength – 660N/sq.mm
  • Elongation (%) – 10
  • Ration (UTS/YS)- ≥ 1.06

Use in construction

Fe 600 may be used in the construction of expressways, metro projects, plants, towers, commercial properties, and industrial zones. They’re used extensively when large-scale projects need to be developed keeping load bearing, durability, and corrosion-resistance in mind.

Opting for leading manufacturers
The most critical aspect of sourcing the right TMT ­­­­grade comes down to the availability of high-quality brands. The right brands offering premier quality TMT focus on international-standard testing and monitoring protocols to provide a consistent product across construction projects.

Brands that are leaders in production and manufacturing also tend to offer transparency in pricing, making the decision-making process expedient and streamlined.

In Conclusion
Based on core project requirements, quality standards and project specifications, the right TMT bars need to be utilized. Project managers should procure high-quality feature-driven TMT bars that are manufactured by the leaders in the steel industry.

Online procurement platforms such as BuildSupply help connect buyers with a variety of TMT bar brands  while outlining unique features that make them the right fit. Procurement managers can sort through various grades, dimensions, and benefits to source from the best supplier for their requirement.

References:
https://www.ibef.org/industry/steel.aspx

https://economictimes.indiatimes.com/industry/indl-goods/svs/steel/sail-launches-new-brand-of-tmt-bars/articleshow/69250654.cms?from=mdr

https://bis.gov.in/qazwsx/sti/STI1786PP6.pdf

https://steel.gov.in/

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