Ferroalloy manufacturers to give you a detailed introduction of the use of nodulating agent
Snodulating agent plays a pivotal role in the casting, so today the inoculant manufacturer will share the role of nodulating agent for you in detail:
The influence of spheroidizer on the tendency of cast iron is twofold:
Rare earth as nodulating agent dissolved in molten iron has a strong effect on the formation of carbide. It is an antigraphitized element. However, adding a small amount of rare earth in the magnesium-based spheroidizer can greatly increase the melting rate of cast iron. Reduce; If the addition amount is large, the tendency of cast iron will be increased. This seemingly contradictory phenomenon is not in fact contradictory. That's because rare earths have a strong ability to combine with sulfur and oxygen.
Influence of spheroidizer on interference suppression element:
In the spheroidizer, some elements have the effect of de-spheroidizing, often called interference elements. Interfering elements can be roughly divided into two categories: one is consumable interfering elements, such as sulfur, oxygen, etc., which are easily used to form compounds with various spherical elements at present; Magnesium, rare earth elements and calcium can all be desulfurized and deoxidized, eliminating their negative effects. Of course, they will consume some of it.
When the spheroidizer contains rare earth elements, its sulfide and oxides are very stable, small particle size, it is difficult to float in the molten iron. In addition, the mismatch between these compounds and the graphite lattice is very small and can be used as heterogeneous precipitates of graphite nuclei. Magnesium oxide MgO is a spheroidizing agent with high melting point, good stability and low solubility in molten iron, but when the particle size is a little larger, it will float to the surface as scum, or may be involved in the casting of slag inclusions.
