What is a ferroalloy? Here's a look at Kangxin International Metallurgy:

Ferroalloy in the broad sense refers to a product that is added to molten iron as a deoxidizer, elemental additive, etc. when steelmaking makes steel have certain characteristics or meet certain requirements. Iron is an intermediate alloy composed of one or several elements and is mainly used in steel smelting. In the steel industry, all intermediate alloys used in steelmaking, whether iron-containing or not (such as silicon-calcium alloys), are also called "ferroalloys". It is also customary to include certain pure metal additives and oxide additives. Ferroalloys are generally used as: deoxidizers: in the steelmaking process to remove oxygen in the molten steel, some ferroalloys can also remove other impurities in the steel such as sulfur, nitrogen and so on. Alloy additives: According to the requirements of steel composition, alloying elements are added to the steel to improve the performance of the steel. Inoculant: Add molten iron to improve the crystalline structure of the casting before casting.