1. The affinity of the sphericalised elements with the elements such as sulphur and oxygen in the iron water. Strong affinity, and with the formation of compounds, as a liquid iron solidification process of foreign, such as rare earths, magnesium, calcium and other spherical elements;
2. the ability of the sphericalising element to change the graphite morphology from flake to sphere;
3. The density and boiling point of the spheroidising element are lower than that of the ferrofluid. Small density can float automatically in ferrofluid, the boiling point is lower than ferrofluid processing temperature, magnesium can be converted to gaseous state under the processing temperature, there is a self-stirring effect, so as to improve the effect of spheroidisation;
4. The content of magnesium oxide in the spheroidising agent is less than about 7% of the magnesium content;
5. The spheroidal agent is dense, no segregation, no shrinkage and loosening, and no chalking;
6. The particle size of the spherical agent is evenly distributed, no powdery alloy, obtuse angle and more deformed particles are good.
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