TMT Steel Bar is the main component in RCC that determines the strength of the structure. The TMT Rebar are highly ductile in nature for which it helps the structure to hold during natural calamities such as an earthquake, Flood as well. To know more in detail you can visit https://shyamsteel.com/blogs/difference-between-fe500-and-fe500d-tmt-rebar/

1. What is the Difference
Between Fe500 and
Fe500D Steel Bar?

2. Introduction
TMT bars are typically graded as Fe 415, Fe 415D, Fe 500, Fe
500D, Fe 550, Fe 550D, Fe 600. where the numbers indicate the
level of stress that must be applied to deform it.
For example, Fe 500 starts to deform when a pressure of 500
Newton/mm2 is applied to it.

3. Different Grades of TMT Bar
Standard Grades of TMT Bars are as follows
Fe-415, Fe-415D, Fe-500, Fe 500D, Fe-550, Fe-
550D and Fe-600
As per IS 1786-2008 minimum Yield Stress & Tensile Strength for
different grade of TMT Rebars are mentioned below.
Property Grade
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
Tensile Strength,
Minimum
10% more
than 0.2% PS,
but not less
than 485.0
N/mm2
12% more
than 0.2% PS,
but not less
than 500.0
N/mm2
8% more
than 0.2% PS,
but not less
than 545.0
N/mm2
10% more
than 0.2% PS,
but not less
than 565.0
N/mm2
6% more
than 0.2% PS,
but not less
than 585.0
N/mm2
8% more
than 0.2% PS,
but not less
than 600.0
N/mm2
6% more
than 0.2% PS,
but not less
than 660.0
N/mm2

4. Which Grade of TMT Rebar is perfect for all
Construction Purposes?
If we look at the Chemical Analysis & Elongation Test as per the
IS 1786:2008 then we can see that the Fe 500/500D is the most
ductile amongst all other TMT Rebar Grades.
Standard minimum elongation percentage on gauge length for different grade
of TMT Re-bars are mentioned below as per IS-1786/ 2008
Property Grade
Elongation
percentage
(minimum)
Fe 415 Fe 415D Fe 500 Fe 500D Fe 550 Fe 550D Fe 600
14.5% 18.0% 12.0% 16.0% 10.0% 14.5% 10.0%

5. Which Grade of TMT Rebar is perfect for all
Construction Purposes?
Also Chemical Proportions for Fe 500/Fe 500D TMT Rebar
Grades are lesser than the other TMT Rebar grades that makes
Fe 500/500D TMT Rebars Higher Corrosion Resistant.
Standard minimum elongation percentage on gauge length for different grade
of TMT Re-bars are mentioned below as per IS-1786/ 2008
Elements
# Percent, Maximum
Fe 500 Fe 500D
Carbon
0.30 0.25
Phophorus & Sulphur
0.55 0.40
Phosphorus + Sulphur
0.105 0.075
CE
0.42 0.42
Nitrogen
120 120

6. Which Grade of TMT Rebar is perfect for all
Construction Purposes?
Chemical Structure determine the best Elongation
IN TMT Rebar “Fe” denotes Iron and “D” stands for elasticity in simple term how
much flexible TMT Rebar is.
Fe 500/Fe 500D Grade of TMT Bars contain lower percentage of sulphur &
phosphorus that makes these bars are highly acceptable for all type of
construction purposes.
Sulphur - Higher percentage of sulphur makes the steel prone to Fire. Using
lesser amount of Sulphur makes it "Fire Resistant".
Phosphorus - Using higher amount of phosphorus makes the TMT bar brittle
which means if the tmt rebar stored where temperature is low the rebars will
become fatigue and it will lead to the external crack on it.
Using lower amount of Sulphur & Phosphorus makes the TMT Rebar highly
ductile, fire resistant & increase the weldability.

7. Which Grade of TMT Rebar is perfect for all
Construction Purposes?
Maximum Mandrel Diameter
Bend Test Upto 20 Over 20
FE 500 4Φ 5Φ
FE 500D 3Φ 4Φ
Fe 500 & Fe 500D TMT both are good for different type of construction purposes
but Fe 500D is more ductile over Fe 500. Tensile strength for both grades are
same but FE 500D is more ductile.
Most reinforced steel will require bending, before being used in a concrete
structure. Because they are relatively high strength steels, and the ribs on the
bar. Surface act as stress concentrators, reinforcing steels may fracture on
bending if the radius of bend is too tight.
The bend test consists of bending a test sample of TMT Re-bar through plastic
deformation by applying a load against a suitable mandrel until a specified angle
(180 degree) of bend is reached. Depending on the requirements of the material
standard such as IS 1786 / 2008; it should be parallel at a specified distance, an
insert is used to control this distance. Test is usually carried out at room
temperature and the bending arrangement with two supports (S1 & S2) and a
Mandrel (M) has been shown below.

8. Why FE 500D is better than FE 500?
•Fe 500D high ductility is the main feature for which it is most used in all
construction purposes. Brittle (Opposite to ductility) material cannot exchange
higher energy. Whereas, FE 500D for high ductility can absorb sudden loads
during natural disasters such as Earthquakes, Flood etc.
•FE 500D is the most preferred TMT Rebar in high seismic zones
•After melting the sponge iron and molten metal in blast furnace in 500D TMT
Rebar, It is standard procedure to dephosphorize the steel in the ladel by
following the metallurgical process.
•Minimization of using the scrap brings control over tramp elements like
Cu,V,Ni,Cr etc.

9. Why FE 500D is better than FE 500?
Fe 500D with lower quantities of carbon, sulphur and phosphorous, helps in
preserving the steel and resisting earthquake shocks in future.
Why FE 500D is the best Grade of TMT Rebar:
FE 500 FE 500D
Tensile Strength
(Minimum)
545 Mpa 565 Mpa
Elongation
(Minimum)
12% 18%
Carbon (Maximum) 0.30% 0.25%

10. Shyam Steel’s FE 500D TMT Rebar
Consistent quality along with uniform Grades
Superior Stability
 Properties for Higher Durability and easy workability.
Its integrated steel plant at Durgapur has DRI Unit, SMS Unit(EAF), Continuous Billet Casting
Mill, sophisticated Rolling Mill and fully-equipped Testing laboratories – all under one roof.
The Company has received ISO – 9001, 14001 and OHSAS 18001 certification.
All About Shyam Steel TMT Bar
To know more visit: https://goo.gl/4tSQ8T

11. Thank You
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