Ferro Molybdenum is an alloy which is formed by combining iron and molybdenum. Ferro Molybdenum is a hardening agent and is found in many alloy steels that are heat-treatable. Ferro Molybdenum prevents corrosion in stainless steels, and when mixed with iron, it also strengthens and hardens into austenite. Ferro Molybdenum comes in many grades, although predominantly it is produced in just two grades (one for US and one for EU) where the content of pure molybdenum is between 60% and 75%.