The decrease in Flexural strength is considerable when temperature increases from room temperature to 300 oC. The difference between Residual and Hot strength decreased as the temperature increases. In addition, the difference between results of NSC with and without steel fibres during Hot test is negligible.t high temperatures, the differences between the results are not significant. This may be due to the fact that steel will be soft at high temperatures, so the effect of steel on Flexural Strength and prevention of crack opening is not significant.