Have been developed by our company to treat molten metal to produce ductile iron castings. Ductile iron has a ferrite matrix. Such castings are used to manufacture large-sized items subjected to heavy mechanical loads while in operation. These grades contain barium so the grade designations have four digits. Barium encourages formation of graphite crystallization centers and discourages formation of cementite.
The optimum combination of such chemically active elements as magnesium, calcium, barium, cerium and lanthanum favors formation of a ferrite structure with a high degree of graphite spheroidization (up to 98%) and a large amount of graphite globules (up to 200 pieces per 1 mm2 of the microsection area). These globules are small (20-300 mm), which contributes to the ductility and strength of the castings.