| 摘要 |
PURPOSE:To accelerate efficiently the graphitization of a cast iron by using an Fe-Si alloy in which Ce is decreased to a specific ratio or below and Al and Ba are incorporated at a specific ratio as an inoculant to accelerate the graphitization of the cast iron. CONSTITUTION:The Fe-Si alloy which is a main material is first charge into a melting furnace (preferably a low-frequency furnace) and is melted. The molten metal is heated to >=1,500 deg.C by conducting electricity thereto and is held at said temp. for about >=5min to oxidize away the impurity element Ce and to decrease the Ce to <=30ppm. The temp. of the molten metal in the furnace is decreased down to about 1,250-1,300 deg.C and Al is added at 0.05-2.0% to the molten metal by using a phosphorizer and thereafter Ba is added thereto at 0.05-2.0% by using the phosphorizer. Such molten metal is tapped into a ladle, from which the molten metal is poured into an ingot case. The formed ingot is ground to about 5mmphi and the inoculant is thus produced. |
