Properties and uses of ferric molybdenum
The atomic weight of molybdenum is 95.94. The outer electronic structure is 4d5s, the melting point is 2615°C, the boiling point is 4610°C, and the density (20°C) is 10.2 g/cm. Molybdenum and iron form α and γ solid solutions and two intermetallic compounds ε (Fe7Mo6) and σ (FeMo) phases. Industrial ferromolybdenum contains about 60% Mo, the melting temperature is 1800-1900 ° C; the density is about 9.0 g/cm.
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 is 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. , has been widely used. 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.
