The role and difference between ferrosilicon and ferromanganese

It has been nearly 100 years since the inoculant was discovered and named today. There are mainly ferrosilicon inoculants, silicon barium inoculants, carbon-based inoculants and cast ductile iron inoculants. There are many kinds of inoculants to meet different production processes. Requirements for inoculants. Its main function is to promote graphitization, reduce the tendency of white buckle, refine grains, reduce segregation, make the grain structure uniform, improve the mechanical strength, improve the morphology and distribution of crystals and graphite, and reduce the internal stress and wall thickness sensitivity of castings. The emergence of inoculants promotes the development of gray cast iron, making the production process of ductile iron and vermicular graphite iron more perfect.

Types of inoculants

Inoculants have different classification methods according to their components and uses. If they are classified according to their components, inoculants include ferrosilicon inoculants, silicon barium inoculants, rare earth inoculants, and carbon-based inoculants.

Ferrosilicon Inoculant

Ferrosilicon inoculants have different use values ​​and market prices because of their different index contents. 45FeSi inoculant has poor inoculation treatment effect, and the use cost of 85FeSi is too high, so 75FeSi and 72FeSi are commonly used in inoculants in steel foundries. Ca and Al in ferrosilicon have a great influence on the inoculation effect, among which Ca has a greater influence, and when it is greater than 0.5%, it has a strong graphite ability. The aluminum content of 75 ferrosilicon is 1.5%, and the aluminum content of 72 ferrosilicon is 2%. Ferrosilicon inoculants are generally 0.2-0.8mm flow inoculants, 1-3mm and 3-8mm particle sizes.

Silicon barium inoculant

Silicon barium inoculants are mainly used in the production of gray cast iron and ductile iron. When used in ductile iron, the silicon-barium inoculant can significantly increase the number of graphite nodules; when used in gray cast iron, it can reduce the tendency of white mouth, refine grains, promote graphitization, and improve the shape of graphite. In addition to improving mechanical properties, silicon-barium inoculants have strong anti-recession ability. Silicon-barium inoculants are mostly used as inoculants containing 2-4% barium. Silicon barium inoculants are generally 0.2-0.8mm flow inoculants, 1-3mm and 3-8mm particle size.