Ferromolybdenum

Ferromolybdenum is an iron–molybdenum ferroalloy used as a source of molybdenum in steelmaking. It is produced as a bulk alloy or in ingot form and is added to molten steel to achieve specific molybdenum contents in stainless steels and various alloy steels. The presence of molybdenum in steel improves hardenability, high-temperature strength, creep resistance, and overall corrosion resistance, making ferromolybdenum a common additive in heat-treatable and high-temperature alloys.

Composition and grades typically consist of about 60 to 75 percent molybdenum, with the remainder iron. Small amounts of other elements, such as silicon or carbon, may be present as impurities or to adjust melting characteristics. Exact compositions vary by producer and intended steel grade.

Production methods involve smelting molybdenum oxide with iron in electric furnaces to form the Fe–Mo alloy, which is then cast into briquettes, ingots, or granules suitable for handling and feeding into steel furnaces. The material is designed to be easily dissolved in molten iron or steel and to deliver a controlled amount of molybdenum to the alloy.

In steelmaking, ferromolybdenum is added in ladle or secondary refining operations or in the converter to achieve the desired Mo content. Its use enhances mechanical properties at elevated temperatures and contributes to stainless and alloy steels’ resistance to corrosion and wear. Ferromolybdenum is produced and supplied worldwide for use in automotive, industrial, and energy applications where durable, high-temperature steels are required.