An iron alloy consisting mainly of rare earth elements and iron. Additives for steelmaking. Used in the cast iron industry as a nodularizing agent, vermicularizing agent, and inoculant. There are many varieties of rare earth composite iron alloys. Such as rare earth magnesium silicon iron REMgSiFe (nodularizing agent, inoculant), rare earth calcium magnesium silicon iron REC; AMgSiFe (desulfurizer, purifying agent, vermicular agent), rare earth calcium silicon iron RECaSiFe (inoculant, vermicular agent), rare earth titanium magnesium silicon iron RETiMgSiFe (vermicular agent), rare earth manganese magnesium silicon iron REMnMgSiFe (spheroidizing agent), rare earth copper magnesium silicon iron RECuMgSiFe (spheroidizing agent), rare earth zinc magnesium silicon iron REZnMgSiFe (vermicular agent), and so on. Rare earth silicon iron is the main variety of rare earth iron alloys.
The rare earth iron alloy has a suitable melting point and density, that is, its density is larger than that of slag, close to that of molten steel, and its melting point is higher than that of rare earth metals, making it easier to add to molten steel and fully alloy it. Therefore, the recovery rate of rare earth added to steel is high. After engineering tests, the results show that the recovery rate is above 50%. In addition, rare earth iron alloys have low activity, strong oxidation resistance, and are easy to store and transport.