Abstract: Low grade silcon carbide is an effective raw material to raise molten steel temperature during the steelmaking in the converter. The results of industrial experiments show that molten steel temperature raising is from 40. 3℃ to 70. 3℃(average 48. 4℃)when low grade silcon carbide is added 8. 0kg per tone steel.Moreover,the addition of low grade silcon carbide can cut dowtt the content of total iron in slag by 1.3%;is beneficial to the slag formation and slag desulphurization,and to decrease the slag erosion of the refractory. This paper also gives the region of the molten semi-steel temperature and its carbon content whether to add or not to add low grade silcon carbide into the converter when the continiued cast steel is smelted in Panzhihua lron & Steel Co