Are you looking for TMT steel? Learn all information you need to know about TMT steel bars, Types, Top Quality, Brands, Prices, and Applications with Builders9Thermo-Mechanically treated bars or TMT Steel bars are used in a wider extent for different construction projects. These bars are prepared through Thermo-mechanical processing that combines the mechanical process with thermal process at various rates into a single process.The various types of TMT Steel are actually identified by their grades. TMT bars have been classified as Fe 415, Fe 500, Fe 550, Fe 600. Where Fe represents the symbol of iron, and the number following it represents the yield strength of steel.