The main purpose of the Mo-Fe join in steel making as molybdenum element agent. Mo steel can be steel with a uniform fine grain structure and improve the hardenability of steel, helping to eliminate temper brittleness. In the high-speed steel, molybdenum can replace part of Tungsten, molybdenum and other alloying elements fit together are widely used in the production of stainless steel, heat resistant steel, acid-resistant steel and tool steel, and alloys with special physical properties, Add molybdenum in iron can be increased strength and wear resistance.