1.
Strength and Ductility of
TMT Bar

2.
What is Strength and Ductility of TMT Bar?
Strength and Ductility are the two most important feature in TMT Bar.
For Strength and Ductility
• Any building or structures Load Bearing Capacity Increases
• The Longevity of the buildings increases
Strength of the TMT Bar = Amount of Stress the materials can take before they
fall or fatigues onto it.
Ductility of the TMT Bar = TMT Bar can bend upto its optimum tensile strength
without loosing its strength or being brittle.

3.
Why Strength and Ductility is Important?
During the manufacturing process of Thermo Mechanical Treatment in
Atmospheric Cooling stage TMT Bars becomes ferrite-pearlite structure.
Ferrite-Pearlite Structure = Soft in inner core and Strong from outside.
TMT Bar is one of the main component in RCC. If the TMT Bars are not strong
enough then the structure will not be able to sustain. Thus, it needs to be strong
enough to take the load bearing capacity.
Ductility is very important in TMT Bars so that it can exchange extra energy during
an earthquake and hold the structure from being uprooted. That is why
Earthquake Resistant TMT Bars are most preferred for all type of construction
purposes.

4.
What is Yield Strength in TMT Bar?
Property Different Grades of TMT Bar
Yield
Stress/0.2
% Proof
Stress.
(Minimum)
N/mm2
Fe 415 Fe 415D Fe 500 Fe 500D Fe 550 Fe 550D Fe 600
415 415 500 500 550 550 600
Yield Strength in Different Grades of TMT Bar
Yield Stress (N/mm2) is different for each grades. As per IS 1786:2008 Fe 500D
comes with the maximum yield strength.
For Fe 500D the Yield Strength is 500.
Yield Strength or Yield Stress is the optimum level of stress point at which the
material started deform. Yield point is where the deformation actually starts. If
the material crosses the yield point some the fractional damage to the material
will be permanent and irreversible.

5.
What is Ductility in TMT Bar?
Ductility means the ability of the material to easily deform and adapt as it is put
under stress with tensile load within a construction unit.
Ductility of the TMT Bar mainly counts on the elongation. How much elasticity
the material has from its original length to the point of collapse. Ductility is the
ability of the TMT Bar to be elongated without loosing its strength.
Ductility in TMT Bar is more important because it determines how much it can
bend as per the construction requirement.
Therefore, Elongation is one of the most important factor before you choose to
buy TMT Bar.

6.
Final Decision to make before buying TMT Bar
TMT Bar should have enough strength so that it can take the load bearing
pressure + TMT Bar should be ductile so that it can be used for all construction
purposes without being brittle.
Then how to take the final decision before you buy TMT Bar?
You should check the below mentioned points before taking the final decision for
buying TMT Bars:
 TMT Bar should have the perfect combination of Strength and Flexibility. So
that it can withstand the load at the same time flexibility makes it usable for all
type of construction purposes. If any of it is not perfect that can result fatal to the
construction. TMT Bar should have
Higher Yield Strength | Ultimate Tensile Strength | Easy Bendability | High
Weldability

7.
Final Decision to make before buying TMT Bar
Amongst few Shyam Steel is the first company in Eastern India who invested
developing their own Integrated Steel Plant. Therefore, since 1953 Shyam Steel
successfully delivering the best in class steel products to the country. Shyam
Steel’s flexiSTRONG TMT Rebar is associated with India’s Largest Projects.
TMT Bar is the most important construction material for your home that
determines the longevity of the structure. So, before buying TMT Bar ensure to
check all the facts and do not compromise with the quality.
As per IS (Indian Standards) 1786:2008 Fe 500D Grade TMT Bar has the perfect
combination of Strength and Flexibility. That is why it is widely used for all
construction purposes.
TMT Bars that are manufactured in ISP (Integrated Steel Plant) are best in quality.
In Integrated Steel Plants reverse mechanism enables preparing the raw materials
at the factory. That ensures quality control.

8.
Thank You
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