TMT bars are Thermo-mechanically treated bars
Here are some key points about Thermo-mechanically Treated (TMT) steel bars:
- TMT bars are high-strength deformed steel bars used in reinforced concrete construction. They are also known as thermo-mechanically treated bars or TMT rebars.
- The TMT process involves heating steel billets to a high temperature, around 900–950°C, and then rapidly cooling them by quenching in water. This improves the mechanical properties of the steel through fine-graining.
- The steel is then passed through a mechanical deformation process of tempering and quenching under controlled temperatures. This gives the steel uniform mechanical properties and improves its strength.
- The key benefits of TMT bars are higher yield strength, greater tensile strength, better ductility, and higher corrosion resistance compared to other rebar types.
- TMT bars have a minimum yield strength of 500 N/mm2 as per IS 1786 standards. Their ultimate tensile strength is around 600 N/mm2.
- The tempering process also makes TMT bars more bendable and easier to use in complex reinforced concrete structures.
- TMT bars are identified by a distinct logo branded on the bars to distinguish them from other rebar types. They are available in different sizes like 8mm, 10mm, 12mm, 16mm, 20mm, 25mm etc.
- In construction, TMT bars are widely used in foundations, beams, columns, slabs, and other structural members that require high-strength reinforcement.