In its pure form, molybdenum is a silvery-white metal and it’s a part of the refractory metals family. It has a melting point of 2,623 °C (4,753 °F); of the naturally occurring elements, only tantalum, osmium, rhenium, tungsten, and carbon have higher melting points. Molybdenum burns only at temperatures above 600°C (1,112 °F). It has one of the lowest coefficients of thermal expansion among commercially used metals.
Typical uses:
Weight % | Molybdenum | Other |
---|---|---|
Typical Composition | 99.95% | 0.05% |
Characteristics | English | Metric | |
---|---|---|---|
Nominal density | 20°C / 68°F | 0.3692 lbs/in3 | 10.22 g/cm3 |
Melting point | 4753 °F | 2623 °C | |
Specific heat | Gas | 0.0516 BTU/lb – °F | 217 J/KG- °K |
0.0609 BTU/lb – °F | 255 J/KG- °K | ||
Average coefficient of
thermal expansion From 0°C to temperature |
20 °C/ 68°F | 2.97 micro in/in- °F | 5.35 micro m/m- °K |
250 °C/ 482°F | 3.33 micro in/in- °F | 6.00 micro m/m- °K | |
500 °C/ 932°F | 3.33 micro in/in- °F | 6.00 micro m/m- °K | |
1000°C/1830°F | 3.61 micro in/in- °F | 6.50 micro m/m- °K | |
Thermal conductivity | 79.8 BTU/ft- hr – °F | 138 W/m – °K |
Temper | Tensile | Hardness | Shear | ||||||
---|---|---|---|---|---|---|---|---|---|
Ultimate | Yield | Modulus of
Elasticity |
Hardness
Vickers |
Modulus | |||||
KSI | MPa | KSI | MPa | KSI | GPa | KSI | GPa | ||
Annealed | 47 | 324 | — | — | 47900 | 330 | 230 | 17400 | 120 |
Stress Relieved | 74.7 | 515 | 60.2 | 415 | 47900 | 330 | — | 17400 | 120 |
Re-crystallized | 28 | 194 | 9 | 62.1 | 47900 | 330 | — | 17400 | 120 |