What are the types of spheroidizing agents:
1. Pressed spheroidizing agent: directly pressurized using magnesium powder and iron powder with the designed silicon content. This 
spheroidizing agent contains very low silicon and is usually called a low silicon pressure spheroidizing agent. It provides a large leeway for subsequent incubation and is beneficial to the production of cast ductile iron. However, this alloy is easy to float and the treatment effect fluctuates greatly. Try to mix it with the lump nodularizing agent during treatment;
2. Core-coated wire-type spheroidizing agent: Coat magnesium powder and iron powder in thin steel plates or steel plates, and quickly send them into the molten iron to achieve the purpose of spheroidizing. This spheroidizing agent is relatively expensive, and the equipment investment is large. However, the alloy absorption rate during processing is high, so the total cost of processing ductile iron is almost not increased;
3. Powdered spheroidizing agent: When using this spheroidizing agent, magnesium powder and inhibitors are mixed into a bag, and the molten iron flows through the surface of the alloy, reflecting it layer by layer with the alloy to achieve the spheroidizing effect. This specialized process Call it MC.