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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

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	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
93W 5Ni 2Cu	17.5 – 17.6	75 – 90	3 – 5	25 – 35	Class 2