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GUIDE TO DIFFERENT TYPES OF TMT STEEL BARS

TMT steel bars are the cornerstones of the civil engineering. TMT stands for Thermo Mechanical Treatment, which is a thermomechanical process on the construction bars to enhance the resistance of the steel bars from breaking under tension.
TMT steel bars have no surface deformities making them ideal for common usage in critical infrastructure for better strength of the constructions. They have a higher load bearing capacity which helps reduce the number of bars required for constructions. Since TMT steel bars are ductile, it results in great elasticity allowing more space for artistic designing. TMT steel bars are also good to withstand any natural disasters like earthquakes, cyclones etc.

Sugna TMT offers you three types of TMT steel bars. They are generally differentiated by their grading, Fe500, Fe500D and Fe600. “Fe” denotes Iron and the numbers stand for the minimum yield stress in N/sq.mm. The letter “D” represents that certain TMT steel bars have higher ductility. The amount of sulphur and phosphorus are low in percentages in these steel bars. These low percentages can cause harm to the steels used during constructions. If the amount of sulphur is high, it leads to Hot Shortness. Which lowers the melting point of steel bars and they would fail under high temperature conditions. If the amount of phosphorus is high, it leads to Cold Shortness. Which causes the steel bars to become fragile under extreme cold conditions where they would start to crack and eventually develop into a rupture. The amount of carbon in these steel bars is low in percentage to improvise the ductility and weldability of the steel.

Fe500 and Fe500D grade:
The Fe500 grade is generally regarded as a common choice for many projects. Its proxy, Fe500D is a popular choice too, which offers great seismic solidity and pliability.
Fe500 can be used across a scope of residential, commercial and multi-storey projects. Their great tensile strength offers stability to taller or higher than nomal projects, while remaining undamaged or unaffected by weights in a better way. While Fe500D offers greater ductility than Fe500, it makes them an ideal choice for constructions in earthquake-prone areas. They generally have a far better minimum elongation percentage of 16% compared to Fe500’s at 12%.

The standards for Fe500 and Fe500D according to Sugna TMT are as follows:
Proof Stress – 530N/sq.mm and 530N/sq.mm
Tensile Strength – 600N/sq.mm and 600N/sq.mm
Elongation – 16% and 18%
Bend Test – Upto 22mm-3D and Upto 22mm-3D and Over 20mm-3D

Fe600 grade:
The Fe600 has a superior tensile strength in comparision to Fe500’s and Fe500D’s. They are basically used across a scope of projects involving large number of areas. Construction procurement managers mostly use Fe600 grade TMT steel bars when developing industrial and extensive infrastructural projects. Infrastructures supporting much of the weight of the overlying parts of a building or other structures like bridges, flyovers or other industrial projects require Fe600 grade TMT steel bars. They can be found useful especially in marine, coastal and underground environments.

The standards for Fe600 according to Sugna TMT are as follows:
Proof Stress – 575N/sq.mm
Tensile Strength – 690N/sq.mm
Elongation – 12%
Bend Test – Upto 22mm-3D