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What are the Types of Tests Conducted to Determine the Quality of TMT Bars?

Thermo Mechanically Treated Bars, or TMT Bars, are witnessing a rise in demand every day. These are the best options for contractors who want to have the best and most durable enforced structures. The market abounds in many brands, but you have to choose TMT bars of the best quality that can make your home or construction structure last for the maximum amount of time. These are some tests that are performed in major TMT manufacturing facilities, such as that of SRMB Srijan Private Ltd., to ensure proper quality.


Tensile Test
UTM or Universal Testing Machine is used to evaluate how strong these reinforcement bars are. It is possible to test Thermo Mechanically Treated Bars of as much as 32 mm capacity without any equipment. The testing is done according to IS 1786 and there is a need to test with machine above this.

Yield Stress Test
This is done to check upto which level a material is able to sustain stress, and when it can start deforming. Such kinds of factors have to be determined at the time of 0.2% Proof Stress /Yield Stress Test. It will get elastically deformed until the material gets to the point of yielding, and get back to its normal shape upon the removal of the stress that is applied.
The material behavior can be categorized broadly into 2 types, ductile and brittle. Generally, aluminum and steel fall in the category of ductile materials. Cast iron and Glass belong to the category of brittle materials. Through the comparison of the stress-strain curve, it is possible to distinguish these two categories.

Bend & Rebend Test:
The Bend test includes bending a test sample of the reinforcement TMT bar with plastic deformation, through the application of a load against an appropriate mandrel until one reaches a specified bend angle (180 degree). Based on the needs of the material standard, like IS 1786/2008, in needs to be parallel at a particular distance. To be able to regulate this distance, an insert is utilized. Generally, testing is conducted at room temperature.
The Rebend test is designed for measuring the impact of Strain ageing (a type of embrittlement effect happening after cold deformation by nitrogen diffusion into the steel) on the steel.

Chemical Analysis Test
In this type of evaluation, a spectrometer is used to test the chemical composition within a span of 10 – 15 seconds. It can offer results of up to 26 elements present in the bar in a printed form.

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Chennai Metro Rail is using SRMB TMT
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