Molybdenum

Molybdenum Facts

Molybdenum is number 42 on the periodic table. With a melting point of 2610°C, molybdenum has a density of 10.22 gm/cc. It has many properties that make it an excellent candidate for fabricated parts that must be made of a refractory metal.

Molybdenum has been used for many years in the lamp industry for mandrels and supports, usually in wire form. Today, several unique properties of molybdenum that satisfy more demanding industry requirements have increased the use of molybdenum as a material in applications requiring other mill forms.

Technical Information

Molybdenum is a silvery white and very hard transition metal. It has a high elastic modulus, and only tungsten and tantalum (of the readily available metals) have higher melting points. It is softer and more ductile than tungsten. It oxidizes at elevated temperatures.

Atomic Number: 42
Atomic Weight: 95.94
Density: (20°C) 10.22 g/CC
Melting Point: 2896 K, 2610°C, 4753°Fm
Boiling Point: 4912 K, 5560°C, 8382°F
Coefficient of Thermal Expansion: (20°C) 4.9 x 10-6/°C
Electrical Resistivity: (20°C) 5.7 microhms-cm
Electrical Conductivity: 30% IACS
Specific Heat: .061 cal/g/°C
Thermal Conductivity: .35 cal/cm2/cm°C/sec
Modulus of Elasticity: (20°C) 46 x 106 psi

Molybdenum provides corrosion resistance that is similar to tungsten. Molybdenum particularly resists non-oxidizing mineral acids. It is relatively inert to carbon dioxide, ammonia, and nitrogen to 1100°C and also in reducing atmospheres containing hydrogen sulfide.Molybdenum offers excellent resistance to corrosion by iodine vapor, bromine, and chlorine, up to clearly defined temperature limits. It also provides good resistance to several liquid metals including bismuth, lithium, potassium, and sodium.

Mass:
Density at 20° C gm/cc - 10.2
Density at 20° C lb/in 3 - 0.368


Thermal Properties:
Melting Point, °C - 2610
Boiling Point, °C - 5560
Linear Coefficient of Expansion per °C - 4.9 x 10-6
Thermal Conductivity at 20°C, cal/cm2/cm°C/sec. - 0.35
Specific Heat, cal/g/°C; 20°C - 0.061

Electrical Properties:
Conductivity, % IACS - 30%
Resistivity, microhms-cm; 20°C - 5.7
Temperature Coefficient of Resistivity per °C (0-100°C) - 0.0046

Mechanical Properties:
Tensile Strength at room temperature, psi - 100,000-200,000
Tensile Strength-500°C psi - 35,000-65,000
Tensile Strength-1000°C psi - 20,000-30,000

Young's Modulus of Elasticity; lb/in2:
Room Temperature - 46 x 106
500°C - 41 x 106
1000°C - 39 x 106

Spectral Emissivity:
(Wave Length approx. 0.65) - 0.37 (1000°C)

Working Temperature: 1600°C

Recrystallizing Temp: 900-1200°C

Stress Relieving Temp: 800°C

Metallography:
Etchant - Hot H2O2; 6% sol
Polishing - Alumina - Rouge to finish

Heat Shields
Furnace Temperature, x F - 1832, 1832, 2012, 2012, 2400, 2400
Cold Shell Temperature, x F - 100, 100, 100, 100, 100, 100
Number of Shields (1 - 10) - 1, 2, 1, 2, 1, 2
Avg. Shield Emissivity Factor (0 - 1.0) - 0.60, 0.60, 0.60, 0.60, 0.60, 0.60
Cold Shell Emissivity Factor (.9 typ) - 0.90, 0.90, 0.90, 0.90, 0.90, 0.90


Computed Shield Temperature IN x F
#1 Shield - 1484, 1646, 1637, 1811, 1965, 2167
#2 Shield - 1250, 1384, 1672

Computed Heat Loss (KW/ft2) - 4.0, 2.4, 5.5, 3.3, 9.8, 5.9

Furnace Temperature, x F - 2400, 2400, 2400, 2400, 2192, 2192
Cold Shell Temperature, x F - 150, 150, 150, 150, 100, 100
Number of Shields (1 - 10) - 3, 4, 5, 6, 1, 2
Avg. Shield Emissivity Factor (0 - 1.0) - 0.60, 0.60, 0.60, 0.60, 0.60, 0.60
Cold Shell Emissivity Factor (.9 typ) - 0.70, 0.70, 0.70, 0.70, 0.90, 0.90

Computed Shield Temperature IN x F
#1 Shield - 2247, 2282, 2305, 2320, 1789, 1976
#2 Shield - 1976, 2087, 2151, 2194, 1517
#3 Shield - 1563, 1832, 1966, 2047
#4 Shield - 1444, 1723, 1869
#5 Shield - 1354, 1636
#6 Shield - 1282

Computed Heat Loss (KW/ft2) - 4.0, 3.1, 2.6, 2.2, 7.3, 4.3

Stock Supplies

These sizes are in stock, subject to prior sale. We also supply other sizes and alloys as well. See additional material information below.

sheet

  • .001″ x 12″ Coil
  • .002″ x 12″ Coil
  • .003″ x 12″ x Coil
  • .005″ x 12″ x 36″
  • .005″ x 24″ x Coil
  • .010″ x 24″ x Coil
  • .015″ x 24″ x Coil
  • .020″ x 24″ x Coil
  • .025″ x 24″ x R/L
  • .030″ x 24″ x R/L
  • .040″ x 24″ x R/L
  • .060″ x 24″ x R/L
  • .080″ x 12″ x R/L
  • .090″ x 12″ x R/L
  • .125″ x 12″ x R/L
  • .187″ x 12″ x R/L

plate

  • .250″ x 12″ x R/L
  • .280″ x 24″ x R/L
  • .375″ x 12″ x R/L
  • .500″ x 12″ x R/L
  • .625″ x 12″ x R/L
  • .750″ x 12″ x R/L
  • 1.0″ x 12″ x R/L
  • 1.125″ x 12″ x R/L
  • 1.187″ x 12″ x R/L
  • 1.250″ x 12″ x R/L
  • 1.375″ x 12″ x R/L
  • 1.500″ x 12″ x R/L
  • 1.750″ x 12″ x R/L
  • 2.0″ x 12″ x R/L

wire

  • .005″ Dia x 200 ft
  • .010″ Dia x 200 ft
  • .015″ Dia x 200 ft
  • .020″ Dia x 200 ft
  • .025″ Dia x 200 ft
  • .030″ Dia x 200 ft
  • .050″ Dia x 200 ft
  • .060″ Dia x R/L Coil
  • .080″ Dia x R/L Coil
  • .090″ Dia x R/L Coil
  • .125″ Dia x R/L Coil

rod

  • .040″ Dia x R/L
  • .050″ Dia x R/L
  • .060″ Dia x R/L
  • .062″ Dia x R/L
  • .080″ Dia x R/L
  • .090″ Dia x R/L
  • .093″ Dia x R/L
  • .125″ Dia x R/L
  • .156″ Dia x R/L
  • .187″ Dia x R/L
  • .250″ Dia x R/L
  • .312″ Dia x R/L
  • .375″ Dia x R/L
  • .437″ Dia x R/L
  • .500″ Dia x R/L
  • .625″ Dia x R/L
  • .750″ Dia x R/L
  • .875″ Dia x R/L
  • 1.000″ Dia x R/L
  • 1.125″ Dia x R/L
  • 1.187″ Dia x R/L
  • 1.250″ Dia x R/L
  • 1.375″ Dia x R/L
  • 1.500″ Dia x R/L
  • 1.625″ Dia x R/L
  • 1.750″ Dia x R/L
  • 2.000″ Dia x R/L
  • 2.125″ Dia x R/L
  • 2.250″ Dia x R/L
  • 2.375″ Dia x R/L
  • 2.500″ Dia x R/L
  • 2.625″ Dia x R/L
  • 2.750″ Dia x R/L
  • 3.000″ Dia x R/L
  • 3.125″ Dia x R/L
  • 3.250″ Dia x R/L
  • 3.500″ Dia x R/L
  • 3.750″ Dia x R/L
  • 4.000″ Dia x R/L
  • 4.500″ Dia x R/L
  • 5.000″ Dia x R/L

tubing

  • .125″ OD x .015″ wall x R/L
  • .187″ OD x .020″ wall x R/L
  • .250″ OD x .020″ wall x R/L
  • .312″ OD x .020″ wall x R/L
  • .375″ OD x .025″ wall x R/L
  • .500″ OD x .030″ wall x R/L
  • .625″ OD x .050″ wall x R/L
  • .750″ OD x .060″ wall x R/L
  • .875″ OD x .040″ wall x R/L
  • 1.0″ OD x .050″ wall x R/L

Material Information

  • ASTM B386, ASTM B387, Type 361
  • ASTM Certifications upon request
  • No cutting fee for custom lengths
  • Custom Sizes Available
  • Custom Stocking Plans Available

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