How steel bar are manufactured by TMT process?

We often hear the term TMT bar. In this article we’ll learn what is meant by the term TMT.

What is TMT?

The full form of TMT is Thermo Mechanically Treated and it’s a manufacturing process steel products like nails, rebars, binding wires etc. Among all other steel manufacturing process , TMT is the considered as the best steel manufacturing process among all other steel manufacturing process. But what’s there in TMT manufacturing process.

Process of TMT Manufacturing

First stage-

Finished TMT steel products are made of majorly iron and carbon with other elements. After collecting the Billets, those are sent to laboratory for testing of elements. After that selected amount of Billets are melted in electric furnaces and the melted liquid is poured into Continuous Casting Machine. From the casting machine rectangular cross sectional billets are produced.
So, from alloy steel billets are ready.

2nd stage-
Now billets are passed through rolling mill to give it a shape of a bar. In the rolling mill stand it’s heated and rolled rapidly.

3rd stage-

Now the billets are tranformed into the TMT bars of various diameters and sizes by quenching, tempring and cooling method.

  1. quenching – After leaving the final milling stand the bars are quenched by special water spray system in the quenching box. This is performed to harden the surface at the same time the core remains soft. Increased tensile strength, durability and the size of shrinks are the benefits of quenching process.
  2. Tempering– As we know the core of the bar is still in a higher temperature it continues to supply heat to the outer surface of the bar. This causes self tempering of the outer surface of the bar.
  3. Cooling– To balance the temperature between the outer surface and the inner core the bars are allowed to cool down in coiling beds in normal temperature. Thus a perfect TMT bar with a strong outer surface and ductile core is manufactured.

But there is a advanced technology of TMT manufacturing which is called Tempcore Technology. This German technology has been proven benificial for steel manufacturers without compromising the quality of steel. To know the benifits of tempcore technology TMT you can read our article here.

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