The role of molybdenum in steel can be summarized as improving hardenability, improving thermal strength, preventing temper brittleness, improving remanence and coercivity, and corrosion resistance in certain media, and preventing pitting corrosion. Due to the various beneficial effects of molybdenum in steel,it has been widely used in a series of steel grades such as structural steel, spring steel, bearing steel, tool steel, stainless acid-resistant steel, heat-resistant steel (also known as heat-strength steel), and magnetic steel. Molybdenum is very effective in improving strength and toughness in cast iron. When the addition amount is 0.25% to 1.25%, it can also form pearlite matrix structure for castings with medium and large sections. Commonly used in rolls and other wear-resistant castings.

FeMo is an iron alloy composed of molybdenum and iron, generally containing 50%-70% molybdenum, and is used as an alloying additive in steelmaking. Ferromolybdenum is an alloy of molybdenum and iron. Its main use is as a molybdenum additive in steelmaking. Adding molybdenum to steel can make the steel have a uniform fine grain structure, improve the hardenability of steel, help eliminate temper brittleness, and alloys with special physical properties. Adding molybdenum to cast iron can improve its strength and wear resistance.

The role of molybdenum in steel can be summarized as improving hardenability, improving thermal strength, preventing temper brittleness, improving remanence and coercivity, and corrosion resistance in certain media, and preventing pitting corrosion.