molybdenum

molybdenum

(Chemical symbol Mo) Element No. 42 of the periodic system; atomic weight 95. 95. Hard, tough metal of grayish-white color, becoming very ductile and malleable when properly treated at high temperatures; melting point 4748 (degrees) F. ; boiling point about 6600 (degrees) F. ; specific gravity 10. 2. Pure molybdenum can best be obtained as a black powder, by reduction of molybdenum trioxide or ammonium molybdate with hydrogen. From this powder, ductile sheet and wire are made by powder metallurgy techniques; these are used in radio and related work. Its principal functions as an alloy in steel making:

Raises grain-coarsening temperature of austenite. # Deepens hardening. # Counteracts tendency toward temperbrittleness. # Raises hot and creep strength, red hardness. # Enhances corrosion resistance in stainless steel. # Forms abrasion-resisting particles.

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