ISPE Glossary of Pharmaceutical and Biotechnology Terminology

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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:

(1) Raises grain-coarsening temperature of austenite.

(2) Deepens hardening.

(3) Counteracts tendency toward temper brittleness.

(4) Raises hot and creep strength, red hardness.

(5) Enhances corrosion resistance in stainless steel.

(6) Forms abrasion-resisting particles.

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