Thermomechanical processing, is a metallurgical process that combines mechanical or plastic deformation process like compression or forging , rolling etc. Then, they are progressively rolled to reduce the billets to the final size and shape of reinforcing bar. After the last rolling stand, the billet moves through a quench box. The shrinkage pressurizes the core, helping to form the correct crystal structures. The core remains hot, and austenitic.
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TMT bars are manufactured by rolling hot steel wires and then passing them through water. TMT bars have a hard outer surface and a soft core inside, which helps in making the bars corrosion resistant and also increases their weldability. It is a high strength construction steel that owes its superior strength than mild steel to the mechanical twisting of cold bar which forms spiral ribs. However cold twisting process results into a product with high residual stress, deformation and surface defects.
TMT bars have better corrosion resistant properties than HYSD bars due to rapid quenching and tempering in manufacturing process. TMT bars can be used in various types of construction works such as concrete structures, bridges and flyovers , dams, thermal and hydel power plants, industrial structures, high-rise buildings, underground platforms in metro railway and rapid transport system.
TMT bars are earthquake resistant because of its high tensile strength and flexibility. TMT bars are highly fire resistant they can absorb to degree Celsius of heat. TMT Bar reduces the transportation cost and it is cost effective too. Share this:.
What is the difference between mild steel and HYSD bars?
10 reasons you should pick TMT bars and not HYSD bars