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Tungsten Bar

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Introduction to Tungsten Bars

Tungsten has about the same electrical conductivity and resistivity, coefficient of thermal expansion, and about the same resistance to corrosion by mineral acids as molybdenum.  Tungsten is high strength at temperatures above 2,000°F, but because the melting point is higher, it retains significant strength at higher temperatures. The elastic modulus for tungsten is about 25% higher than that of molybdenum, and its density is almost twice that of molybdenum. All commercial unalloyed tungsten is produced by powder-metallurgy methods; it is available as rod, wire, plate, sheet, and some forged shapes. For some special applications, vacuum-arc-melted tungsten can be produced, but it is expensive and limited to relatively small sections.

Several tungsten alloys are produced by liquid-phase sintering of compacts of tungsten powder with binders of nickel-copper, iron-nickel, iron-copper, or nickel-cobalt-molybdenum combinations; tungsten usually comprises 85 to 95% of the alloy by weight. These alloys are often identified as heavy metals or machinable tungsten alloys. In compact forms, the alloys can be machined by turning, drilling, boring, milling, and shaping; they are not available in mill product forms because they are unable to be wrought at any temperature.

 

Applications

Typical Applications include weights and counterbalances for aircraft control surfaces and rotor blades, guidance platforms, counterbalances for fly wheels, turbines and engine crankshafts, vibration damping governors, filaments, and fuse masses.  Other applications include radiation shielding, gyro rotors, weapons including armor piercing applications, and high temperature tooling.

Alloy Type
(%)		 90 W
6 Ni
4 Cu		 90 W
7 Ni
3 Fe		 92.5 W
5.25 Ni
2.25 Fe		 92.5 W
Balance
Ni, Fe, Mo		 93 W
Balance
Ni, Fe, Mo		 95 W
3.5 Ni
1.5 Cu		 95 W
3.5 Ni
1.5 Fe		 97 W
2.1 Ni
.9 Fe
MIL-T-21014 Class 1 Class 1 Class 1 - - Class 3 Class 3 Class 4
SAE-AMS-T-21014 Class 1 Class 1 Class 2 - - Class 3 Class 3 Class 4
AMS 7725 C 7725 C 7725 C -- -- -- -- -- --
ASTM B777-87 Class 1 Class 1 Class 2 - - Class 3 Class 3 Class 4
Typical Density
(g/cc)		 17.1 17.1 17.5 17.6 17.7 18 18 18.5
Typical Density
(lbs/in3)		 0.614 0.614 0.632 0.636 0.639 0.65 0.65 0.668
Typical Hardness RC 24 25 26 30 32 27 27 28
Ultimate Tensile Strength Min
(ksi)		 110,000 120,000 114,000 120,000 125,000 110,000 120,000 123,000
0.2% Offset Yield Strength Min
(ksi)		 80,000 88,000 84,000 90,000 95,000 85,000 90,000 85,000
Minimum % Elongation
(1" gage length)		 6 10 7 4 4 7 7 5
Proportional Elastic Limit
(PSI)		 45,000 52,000 46,000 55,000 60,000 45,000 44,000 45,000
Modulus of Elasticity
(x106psi)		 40 x 106 45 x 106 47 x 106 52 x 106 53 x 106 45 x 106 50 x 106 53 x 106
Coefficient of Thermal Expansion x10-6/0C
(20-400C)		 5.4 4.61 4.62 4.5 4.5 4.43 4.6 4.5
Thermal Conductivity
(CGS Units)		 0.23 0.18 0.2 0.27 0.27 0.33 0.26 0.3
Electrical Conductivity
(% IACS)		 14 10 13 14 14 16 13 17
Magnetic No Slightly Slightly Slightly Slightly No Slightly Slightly
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