The spheroidization level of domestic ordinary spheroidal graphite cast iron castings is required to reach level 4 or above, (that is, the spheroidization rate is 70%), the spheroidization rate achieved by the general foundry is about 85%. In recent years, with the development of nodular cast iron production, especially in industries with high requirements for wind power casting production and casting quality, the spheroidization level is required to reach level 2, that is, the spheroidization rate reaches more than 90%.
In the production of ferritic nodular cast iron, when the spheroidization rate is required to reach more than 90%, the following measures can be adopted:
(1) Choose high-quality charge to reduce the de-spheroidization elements in the charge.
(2) Choose a spheroidizing agent with a low amount of ω (RE) to reduce the deteriorating effect of RE on the morphology of spheroidal graphite.
(3) The ω (S) content of the original molten iron should be less than 0.020%, which can reduce the consumption of nodulizers, especially the nodulized elements consumed by the secondary sulfurization of the sulfide slag.
(4) Pre-deoxidize the molten iron, increase the number of graphite spheres per unit area, increase the spheroidization rate, greatly improve the ability to resist recession, and extend the effective incubation time.
(5) Reduce the amount of ω (Si) in the original molten iron, increase the amount of spheroidizing agent, inoculant and various pretreatment agents, and strengthen the inoculation treatment.
ABOUT KEVA
Keva Casting is a professional casting company that focuses on Construction, Machinery, Automobile, Hardware, Pipeline and many other industries.
We provide top quality products with the best service based on our complete production chain including our own mold design, advanced production techniques, and full management of the supply chain. Keva Casting has two factories located in Zhucheng, China's Shandong province.
We use "shell molding", which is a new technique that has been developed in recent years.This new technique has simplified production procedures and reduced air pollution compared with traditional sand casting and investment casting. Shell making and core making are faster to ensure production in enormous quantities. The dimensions and surface finishing are satisfactory for all kinds of industrial requirements. Besides supplying our own formwork & scaffolding systems, our casting products also supply OEM services in various industries.