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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

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

Click here for Tungsten Heavy Powder’s Material Data Safety Sheet.

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

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