The basic requirements for spheroidizing agents are.

(1) Strong spheroidization ability;

(2) Abundant resources, low price, easy to melt;

(3) Strong adaptability to various components (such as eutectic degree, sulfur content, anti-spheroidizing elements and alloying elements) and temperature;

(4) The spheroidization reaction has good kinetic conditions, stable reaction, easy elimination of reaction products, less dosage, less cooling, and good spheroidization processing technology