They are manufactured under a process called Thermo Mechanical Treatment, after which they are named. They are manufactured by passing hot rolled steel billets through water, which hardens the surface and increases its tensile strength while the inner core stays at a comparatively warmer temperature and hence, the core becomes more ductile. This variation in the microstructure of the cross-section of the bar provides huge strength to the bar. Since there are no twisting or deformation processes employed in this method, TMT bars have no surface cracks or other defects as well. In this type of steel, after undergoing the heat treatment process, the hot steel rods are either heat rolled or cold twisted for shaping, thus making them both thermally and mechanically treated. It is a form of HYSD steel, where the steel bars, after undergoing the mandatory heat treatment process, are cold twisted and deformed.

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These are also known as HYSD bars. They have higher percentage of carbon as compared to mild steel. Their strength is higher than that of mild steel. Deformed bars are represented by symbol. A deformed bar has corrugation or ribs on the surface of the bar, to increase the bond and prevent slipping of the bar in concrete. These bars do not show a definite yield point. So, the yield point is taken as 0. HYSD bars are preferred as reinforcement in R.

The HYSD bars have better bond with concrete due to corrugations or ribs on the surface of the bars. The cost of HYSD bars is approximate same as mild steel but the use of HYSD bars leads to overall economy as the amount of steel required is less, due to its higher strength. Lot of steel about 40 million tonnes has been saved in India, since , because of replacement of mild steel by the Tor steel, and the saving amounts to Rs. January 19, January 19, July 7, July 7, March 17, March 17, Your email address will not be published.

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Why TMT Bars Are Better Than HYSD Bars

Register now or log in to join your professional community. Mild Steel is general purpose steel grade, basically used for remelting, alloying and maufacturing of fabrication of various structures. The Steel generally made of low Carbon and Silicon. The yield strenght values are very low for Mild Steel, as the name suggest. Therefore it is not used for special purpose of reincforcing and heavy strcuture manufcaturing.


Reasons why TMT bars are better than HYSD bars

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