Answer / nknehru

1.TOR bars are coming under HYSD category and TOR is a brand name - Toristeg Steel Corporation of Luxembourg. TOR usually refers to cold treated bars.
2.TMT bars or Thermo Mechanically Treated bars are coming under HYSD category bars and manufactured by rolling steel wires and then passing them through water. TMT bars have a tough external layer and a soft core inside, which makes TMT bars corrosion –resistant and also increases their weldability.TMT refers to hot treated bars.
3.Round plain steel bars dominated the construction industry till seventies. Thereafter CTD (or TOR Steel) dominated the industry till nineties. Nowadays TMT or hot treated bars are the most popular due to its advantages over CTD (TOR) such as high strength and corrosion resistance

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