What is the Difference Between FE 500 & FE 500D TMT Bar?

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.
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1. What i s t he 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

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