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About Tungsten

History

The word, “tungsten” denotes a substance of high density, and is derived from the Swedish language, “tung”, meaning “heavy,” and “sten”, meaning “stone.” The chemical symbol for tungsten is W, which stands for wolfram. The name came from medieval German smelters, who found that tin ores containing tungsten had a much lower yield. It was said that the tungsten devoured the tin “like a wolf”. Pure tungsten metal was first isolated by two Spanish chemists, José and Fausto de Elhuyar in 1783.

General Information

Tungsten has the highest melting point of any metal, and at temperatures over 3410°C (6170°F), also has the highest tensile strength. It has excellent corrosion resistance and is only attacked slightly by most mineral acids. Tungsten is extremely environmentally friendly.

Our Tungsten can now also be plated.

Main Tungsten Properties

Atomic Number
74
Atomic Weight
183.86
Maximum Density @ 20°C (68°F)
19.3 g/cc; 0.697 lb/cu.in.
Melting Point
3410°C (6170°F)
Linear Coefficient of Expansion
4.3 x 10E-6°C
Thermal Conductivity @ 20°C
0.40 cal/cm/°C/sec
Specific Heat @ 20°C
0.032 cal/g/°C
Electrical Conductivity
31% IACS
Tensile Strength @ Room Temp.
100,000 – 500,000 psi
Tensile Strength @ 500°C (932°F)
75,000 – 194,000 psi
Tensile Strength @ 1000°C (1832°F)
50,000 – 75,000 psi
Poisson’s Ratio
0.284
Hardness (Mineral)
7.5
Hardness (Vickers)
3430
Hardness (Brinell)
2570

Tungsten Alloy Properties & Classes

Tungsten
Alloy
Density
(g/cc)
Tensile Strength
(KSI)
Elongation
(%)
Hardness
(Rc)
ASTM B777-07(2013)
Tungsten Nickel Iron Alloys
85W
10.5Ni
4.5Fe
15.8 – 16.0
105 – 145
20 – 33
20 – 30
90W
7Ni
3Fe
16.9 – 17.1
105 – 145
20 – 33
24 – 32
Class 1
90W
6Ni
4Fe
16.7 – 17.0
105 – 145
20 – 33
24 – 32
Class 1
91W
6Ni
3Fe
17.1 – 17.3
105 – 145
15 – 28
25 – 30
Class 1
92W
5Ni
3Fe
17.3 – 17.5
105 – 145
18 – 28
25 – 30
Class 2
92.5W
5Ni
2.5Fe
17.4 – 17.6
105 – 145
25 – 30
25 – 30
Class 2
93W
4Ni
3Fe
17.5 – 17.6
105 – 145
15 – 25
26 – 30
Class 2
93W
4.9Ni
2.1Fe
17.5 – 17.6
105 – 145
15 – 25
26 – 30
Class 2
93W
5Ni
2Fe
17.5 – 17.6
105 – 145
15 – 25
26 – 30
Class 2
95W
3Ni
2Fe
17.9 – 18.1
105 – 135
8 – 15
25 – 35
Class 3
95W
3.5Ni
1.5Fe
17.9 – 18.1
105 – 135
8 – 15
25 – 35
Class 3
96W
3Ni
1Fe
18.2 – 18.3
90 – 120
6 – 10
30 – 35
Class 3
97W
2Ni
1Fe
18.4 – 18.5
90 – 120
8 – 14
30 – 35
Class 4
98W
1Ni
1Fe
18.4 – 18.6
75 – 120
5 – 10
30 – 35
Class 4
Tungsten Nickel Copper Alloys
90W
6Ni
4Cu
17.0 – 17.2
90 – 120
4 – 8
25 – 35
Class 1
95W
5Ni
2Cu
17.5 – 17.6
75 – 90
3 – 5
25 – 35
Class 2