How to Choose the Right Nodulizer?

Nodulizer

How to Choose the Right Nodulizer?


(Summary description)Spheroidizing agents can promote graphite crystallization in nodular cast iron into spherical additives. General application field, cast iron casting field. However, there are many types and contents of spheroidizing agents on the market. Therefore, it is also imperative to choose a suitable spheroidizing agent.


Spheroidizing agents can promote graphite crystallization in nodular cast iron into spherical additives. General application field, cast iron casting field. However, there are many types and contents of spheroidizing agents on the market. Therefore, it is also essential to choose a suitable spheroidizing agent.


There are data from the reaction thermodynamics of spheroidizing elements in molten iron, reaction kinetics, quality influencing factors in the production process of spheroidizing agent, and process influencing factors in the use process of foundries. The standards for determining the quality of spheroidizing agent are as follows:


(1) The affinity of spheroidizing elements with elements such as sulfur and oxygen in molten iron. It has a strong affinity and forms a compound with it, which acts as the foreign core in the solidification process of molten iron, such as rare earth, magnesium, calcium, and other spheroidizing elements.


(2) The ability of spheroidizing elements to change the shape of graphite from flake to spherical.


(3) The density and boiling point of the spheroidizing agent are lower than that of molten iron. The low density can automatically float in the molten iron, and the boiling point is lower than the treatment temperature of the molten iron. Magnesium can be transformed into a gaseous state at the treatment temperature and has a self-stirring effect, thereby improving the spheroidization effect.


(4) The magnesium oxide content in the spheroidizing agent is equal to about 10% of the magnesium content.


(5) The spheroidizing agent is dense, has no segregation, shrinkage, and porosity, or powder.


(6) The spheroidizing agent has a uniform particle size distribution, no powdery alloy, and obtuse-angle deformed particles are better.


(7) The above conditions basically cover the quality requirements in the production and use of the nodulizer, so it can be used as a unified standard for the quality of the supplier and the demander.


Spheroidizing agent is a widely used additive in the cast iron industry. The quality and performance of the spheroidizing agent are very important. Therefore, on the basis of selecting high-quality products, add them in accordance with the instructions for use to achieve the best use effect.


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