The decomposition of cementite formed from hematite and pre-oxidised titanomagnetite was investigated in the temperature range from 500°C to 925°C for hematite, and from 300°C to 1100°C for titanomagnetite under a carburising atmosphere in a fixed bed reactor. For hematite, cementite was most stable at temperatures 7S0-770°C. The decomposition rate increased with decreasing temperature between 7S0°C and 600°C and with increasing temperature above 770°C. For ironsand, cementite was most stable in the temperature range 700-900°C. The rate of decomposition of cementite increased with decreasing temperature between 700°C and 400°C and with increasing temperature above 900°C. Cementite formed from ironsand was more stable than cementite formed from hematite.