TMT Steel Weight Chart Part-II

tmt steel weight chart part 2 rightsteel

Our last blog described the TMT steel bars and its importance as reinforcement for the construction of commercial buildings. More specifically, it described the standard IS 1786:2008 that every reinforced steel bar should conform to. The IS standard defines certain guidelines that must be followed when manufacturing the reinforced steel bar. These guidelines or specifications are the weight of the TMT steel, mechanical properties and chemical properties of the rebar. The weight chart of reinforced steel was described in the previous blog. Here we explain the remaining two features

Why do the Standards matter

The main purpose of these standards is to ensure that the reinforced steel bars are authentic and safe for the construction of buildings. The standard also ensures the separation of counterfeit steel bars from the original bars. Let us see the mechanical and the chemical properties that are specified by the IS 1786:2008 standard for each of the reinforced steel TMT bar grades.


TMT Steel Mechanical properties


Parameters IS 1786:2008
Fe 415 Fe 500 Fe 550 Fe 600
Yield strength (N/mm2) 415 500 550 600
Ultimate Tensile Strength (N/mm2) 485 545 585 660
Elongation(%) 14.5 12 10 10
UTS/YS Ratio 1.16 1.09 1.06 1.1

As per the specifications of IS 1786:2008, these are the mechanical property values that every TMT steel bars of appropriate grades should have otherwise they are considered counterfeit that are most likely manufactured from low-quality steel and other components. When deciding to purchase the right TMT steel bar, these parameters must be well known.


TMT bars chemical composition


Parameters IS 1786:2008
Fe 415 Fe 500 Fe 550 Fe 600
Carbon (Max) 0.3 0.3 0.3 0.25
Sulphur  (Max) 0.060 0.055 0.060 0.04
Phosphorous  (Max) 0.060 0.055 0.060 0.04
Sulphur+Phosphorous  (Max) 0.110 0.105 0.110 0.75

To produce the TMT steel bars with the right strength and ductility ratios, the chemical elements must be used in the exact range as specified by the IS standard. If the reinforced bars are manufactured with any variations in chemical composition, it will affect the integrity of the bar and it makes them vulnerable in handling structural loads.


When choosing the right TMT steel bars, apart from knowing the grades, always know these specifications too i.e the weight, mechanical properties and the chemical composition of the steel bar. For building residential homes and buildings, the best TMT steel grade is the Fe 415. What makes it ideal is its uncompromised ductility factor when compared with its higher variations.

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