Are used for in-mold treatment of molten metal to subsequently produce spheroidal graphite iron castings.
These spheroidizers make it possible to obtain consistent results at their minimum consumption rates (0.7-1.0% of the total weight of the melt) as compared to other melt treatment methods. They are used to produce spheroidal graphite cast irons with predominantly ferrite and pearlite-ferrite matrices (GGG40, GGG45, GGG50). Besides, SPHEROMAG®500, 600 and 700 spheroidizers contain lanthanum, and when they are used for in-mold treatment of cast iron melts, the degree of undercooling of the molten metal as it crystallizes is higher than when it is treated by an ordinary spheroidizer, FeSiMg5-7. SPHEROMAG®500, 600 and 700 spheroidizers also favor formation of graphite globules with regular geometric shapes and reduce the likelihood of formation of gas- and shrinkage-related porosity defects in castings.
The sizes of spheroidizers used for the in-mold treatment process vary within a narrow range (0.8-4.0; 1.0-4.0; 1.0-5.0 and 0.5-3.0 mm) and depend on the types of casting equipment used by customers. Our company also produces these spheroidizer grades in ingot form with its subsequent crushing and sizing.