TMT Bars

Technological Developments

TMT Bar

Requirement of High Strength Rebars Problems associated with High Strength Rebars Technological developments in production processes of High Strength Rebars
Comparison of different processes for production of High Strength Rebars TMT Bars Manufacturing process TMT bars vs “Quenched & Tempered” bars
Advantages & Applications International Scenario Indian Scenario

Technological developments in production processes of High Strength Rebars

In recent past, there have been two major technological developments in processes for production of High Strength Deformed Bars. These are:

(i) Microalloying &

(ii) so called TMT process;.

These are discussed below:

Microalloying with Nb, V, Ti & B, in combination or individually helps in meeting most of these requirements and producing High strength reinforcement bars having yield strength of 500 and 550 MPa.

Production of reinforcement bars by the addition of micro-alloys gives the desired results of high strengths but at a cost, which is prohibitive. Moreover, the achieved ductility is also low.

The need for cutting down the cost of production of high strength reinforcement bars initiated the involvement of a more economical and competitive process — the so called Thermo Mechanical Treatment (TMT) Process.

The Thermo Mechanically Treated bars are generally called TMT bars. These bars owe their advantage to their composite micro-structure, which is a soft and ductile ferrito-pearlitic core and a tough surface rim of tempered martensite.

The use of Thermo Mechanical Treatment process has not only helped produce reinforcement bars of high yield strength but also having superior ductility, weldability, bendability & better corrosion resisting properties.

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References:
Latest developments on steel front” by Jagvir Goyal
Thermex Quenching and Tempering Technology” by R.K. Markan, the Chairman and Managing Director of H&K India
Websites of SAIL, Rajuri steel & Evcon

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