Abstract
The radioactive lime (45CaO) were added in the reducing slag of 60t electric furnace. Radio activity in the macroscopic inclusions extracted from the killed steel ingot with slime method were measured.
The results are as follows.
1) CaO in macroscopic inclusions in killed steel are originated from the reducing slag in electric furnace process by 50-70%. But the ratio of included slag to total compositions of inclusions are 4.5%.
2) The amount of inclusion from slag in molten steel are reduced by 40% during holding the ladle in 10min after tapping.
