Application of Cored Wire for Cast Iron

The cored wire is mainly used for alloying, desulfurization, inoculating and nodulizing process of cast iron.

 

Adding one or more alloying elements to cast iron can effectively improve the mechanical, physical and chemical properties of cast iron. Elements such as Mo, Cu, Sn, Mn can significantly refine pearlite in cast iron, thereby improving the strength and hardness of cast iron. The alloying composition of large-capacity cast iron hot metal can be fine-tuned, and the wire feeding process can be adopted, so as to improve the environment and increase economic benefits.

 

Inoculating process is used to control the structure and properties of cast iron. It is achieved by increasing the number of graphite nuclei through the growth of graphite sheets of gray iron and graphite balls of ductile iron. The specific method of Inoculating is to add a material to the molten iron that is cast to the molten iron, which will provide graphite with a suitable core forming point. The most effective inoculant is a ferrosilicon alloy containing a small amount of one or several elements such as Ca, Ba, Sr, Zr, Ce. The method of adding an inoculant to molten iron is generally added to the molten iron before casting. In recent years, The method of adding the Cored Wire process to the molten iron has gradually replaced the method of manual investment, and has achieved good inoculate results.

 

The nodulizing of cast iron generally uses the process of adding magnesium element, but adding metal magnesium to cast iron water has many disadvantages, such as easy to cause splashing, difficult to control, and expensive. The method of adding magnesium to molten iron by using a covered wire has a very good effect. Magnesium has a high utilization rate and a high nodularity.

 

When processing hot metal with high sulfur content, magnesium powder can be mixed with desulfurizing agents such as CaC2. In low sulfur molten iron, magnesium cored wire mixed with inoculant can be used for magnesium treatment and incubation treatment. The reaction of molten iron and magnesium causes the molten iron to stir, which can promote the uniform distribution of noculant. If the molten iron contains other residual elements, a rare earth-containing alloy may also be filled in the cored wire.