EFFECT OF SUPERHEAT ON RIM THICKNESS IN RIMMING STEEL INGOTS

Rimming steel consists of Carbon approximately 0.08 - 0.09% and Manganese 0.40 - 0.50%. This grade contains high oxygen (ppm) level in the bath around 1000 - 1200 and 225 - 275 in ladle after tapping. Rimming grade steel is casted only through ingot teeming route. Rim thickness and Rimming duration are the main physical quality parameters of a rimming steel ingot. Of all the parameters, the casting temperature of steel plays a very important role in determining the quality of rimming steel. Superheat is the temper ature by which the ladle temperature exceeds the liquidus temperature of steel. The magnitude of superheat affects the rate of solidification of steel in mould, as a result of which, the rimming intensity gets affected, which in turn, affects the rim thic kness. Therefore, the study of superheat - rimming intensity correlation is important in controlling the quality of rimming steel.