1. Magnesium contents of 4%, 5%, and 5.5% are low-magnesium spheroidizing agents, with RE between 1% and 2%. They are mostly used for intermediate frequency furnace smelting and spheroidizing treatment of low-sulfur iron liquid. It has the advantages of gentle spheroidization reaction and easy and full absorption of spheroidized elements.
2. The magnesium content of 6% and 7% belongs to the medium magnesium series spheroidizing agent, which is mostly used for double melting of cupola furnaces, electric furnaces, or medium frequency furnaces for melting pearlite-shaped ductile iron castings. According to the wall thickness of the casting and the sulfur content of the original molten iron, the appropriate amount of spheroidizing agent is determined. It has a wide range of applications and a wide range of spheroidizing treatment processes.
3. High magnesium series spheroidizing agent is suitable for cupola furnace smelting and molten iron with a sulfur content of 0.06%-0.09%. The addition amount is between 1.6%-2.0%. ?
4. Low-aluminum spheroidizing agent is used in castings that are prone to subcutaneous pore defects, as well as castings that have requirements for the aluminum content of the molten iron.
5. For spheroidizing agents produced from pure Ce and pure La, after spheroidizing treatment, the molten iron will have few pure inclusions and the graphite balls will be round. The spheroidizing agent produced from yttrium-based heavy rare earth is suitable for large-section castings, delaying the decline of spheroidization and preventing lump graphite. Nodulizing agent containing Sb is used for pearlitic ductile iron.
