TMT Bars

Comparison of different processes


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

Comparison of different processes for production of High Strength Rebars

Comparative features of the three main processes for production of High Strength Deformed Bars viz (i) Cold Twisting , (ii) Microalloying & (iii) so called TMT process are tabulated below:

S.No Process Treatment Costs Ductility Weld-ability
1 Cold Twisting Cold work hardening by means of:
¶ Stretching
¶ Twisting
High (Due to Manpower and Equipment) Poor Good (deteriorating due to heat generated by welding)
2 Micro- Alloying Addition of alloying elements as: C, Mn, V, Nb etc. High (Due to alloying elements and equipment) Good Poor (Due to high carbon equivalent)
3 TMT Process Rapid cooling and controlled cooling from rolling heat Low Excellent Excellent (Due to low carbon equivalent)
The TMT bars have virtually replaced TMT barsthe conventional cold twisted deformed bars as reinforcement material all over the world.

With the increasing availability of TMT bars here, India is also set to change over to the use of TMT bars.


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