REFRACTORY METALS
+
74
W
Tungsten
183.85
Number
Symbol
Element Category
Transition Metal
PHYSICAL PROPERTIES
Phase
Solid
STD Atomic Weight
183.85
Melting Temperature
3422°C, 3695°K
Boiling Point
5930°C, 6203°K
Crystal Structure
Body-centered Cubic
Electrical Resistivity
52.8 nΩ·m
Thermal Conductivity
164 W/m K at 20°C
Thermal Expansion
4.5 µm/(m·K)
Density g/cc
19.3
ASTM STANDARD SPECIFICATIONS
ASTM B760
Tungsten
+
+
73
Ta
Tantalum
180.95
Number
Symbol
Element Category
Transition Metal
PHYSICAL PROPERTIES
Phase
Solid
STD Atomic Weight
180.95
Melting Temperature
3017°C, 3290°K
Boiling Point
5458°C, 5731°K
Crystal Structure
Body-centered Cubic
Electrical Resistivity
131 nΩ·m
Thermal Conductivity
57.5 W/m K at 20°C
Thermal Expansion
6.3 µm/(m·K)
Density g/cc
16.6
ASTM STANDARD SPECIFICATIONS
ASTM B708, F560
Tantalum
+
+
41
Nb
Niobium
92.91
Number
Symbol
Element Category
Transition Metal
PHYSICAL PROPERTIES
Phase
Solid
STD Atomic Weight
92.91
Melting Temperature
2477°C, 2750°K
Boiling Point
4744°C, 5017°K
Crystal Structure
Body-centered Cubic
Electrical Resistivity
152 nΩ·m
Thermal Conductivity
53.7 W/m K at 20°C
Thermal Expansion
7.3 µm/(m·K)
Density g/cc
8.57
ASTM STANDARD SPECIFICATIONS
ASTM B393
Niobium
+
+
42
Mo
Molybdenum
95.94
Number
Symbol
Element Category
Transition Metal
PHYSICAL PROPERTIES
Phase
Solid
STD Atomic Weight
95.94
Melting Temperature
2623°C, 2896°K
Boiling Point
4639°C, 4912°K
Crystal Structure
Body-centered Cubic
Electrical Resistivity
53.4 nΩ·m
Thermal Conductivity
142 W/m K at 20°C
Thermal Expansion
4.8 µm/(m·K)
Density g/cc
10.2
ASTM STANDARD SPECIFICATIONS
ASTM B386, B387
Molybdenum
+
