Effect of Rolling Temperature and Rolling Speed on Mechanical Properties of QTB Passed TMT re-bar

Kankan Prosad Mandal

TMT re-bar is produced by using QTB process where hot-billets are rolled through several horizontal and vertical rolls then passed through water for quenching purposes. Mecanical properties such as yield strength, Ultimate tensile strength, elongation and bending properties are depends on previous thermo mechanical treatment, billet Chemistry and cooling rate at quenched and tempered bath of re-bars. In this paper, we only discuss about effect of billet temperature and last stand speed on yield strength of re-bar. It is found that high billet temperature produces a low-yeild re-bar where as high speed produces a low yield re-bar too due to soaking effect at furnace and cooling effect at QTB respectively.