Tungsten (Wolfram, W): A Strategic Refractory Metal for Applications Requiring Extreme Temperature and Density
Element Properties and Chemical Definition
Tungsten is an extremely hard, dense, grey-white metal with atomic number 74 in the periodic table and a high melting point. It is a refractory transition metal. Its symbol is W, and although it is called “Tungsten” in English, the German-origin name “Wolfram” is widely used in the international metallurgy literature.
This metal is not found free in nature; it is generally obtained from the minerals scheelite (CaWO₄) and wolframite ((Fe,Mn)WO₄).
Tungsten Standards and Specifications
- ASTM B760 – sheet, plate and strip
- ASTM B777 – heavy alloys (such as tungsten-nickel-iron)
- ASTM F288 – Tungsten used in electronic and vacuum devices
- ISO 6841, ISO 6842 – Sintered tungsten products
- MIL-T-21014 – Tungsten components used in military and aerospace
- UNS R07005 – R07031 – numbering system
Tungsten Physical and Mechanical Properties
Among all metals in nature it stands out for having the highest melting point. At the same time, thanks to its high density and low expansion coefficient, it is an ideal material in advanced engineering applications.
- Melting Point: 3422 °C (the element with the highest melting point)
- Boiling Point: ~5555 °C
- Density: 19.3 g/cm³ (almost equal to that of gold)
- Brinell Hardness: ~350 HB (pure), higher in sintered forms
- Modulus of Elasticity: ~400 GPa
- Thermal Conductivity: ~173 W/m·K
- Electrical Resistivity: 5.6 µΩ·cm
- Coefficient of Thermal Expansion: 4.5 µm/m·K (very low)
Crystal structure: BCC (Body-Centered Cubic)
Machinability: Not suitable for cold working; it is mostly sintered by way of powder metallurgy.
Trade Names
It is rarely used in pure form; it mostly appears before us as tungsten heavy alloys (WHA – Tungsten Heavy Alloys) in the following systems:
- W-Ni-Fe (Tungsten-Nickel-Iron)
- W-Ni-Cu (Tungsten-Nickel-Copper)
- WC (Tungsten Carbide) – The backbone of the tool steel and hard metal industry
- Thoriated Tungsten (W-ThO₂) – Used in electron emission
- Lanthanated/ Ceriated Tungsten – For TIG welding electrodes
Its common commercial names:
- Densalloy® – Defence and ballistic applications
- Mallory® 1000 – Vibration dampers
- Hevimet® – Aerospace and nuclear industry
- MegaTungsten™ – For special high density applications
Application Areas
It is preferred in sectors with very special physical and mechanical demands:
1.Defence Industry and Ballistic Systems
#Armour piercing ammunition cores
#Radiation attenuating shields
#Non-fragmenting kinetic energy ammunition
2.Aerospace Industry
#High temperature resistant jet engine parts
#Temperature compensators and balancing weights
3.Nuclear Energy Systems
#High density radiation barriers
#Tokamak and fusion reactor components
4.Electrical and Electronics
#Vacuum tube electrodes
#Anodes and targets in X-ray tubes
3Filament wires (tungsten’s first use for this purpose goes back to Edison’s time)
5.Welding Technology
#TIG welding electrodes (Thoriated, Ceriated, Lanthanated Tungsten types)
#Preferred thanks to arc stability and heat resistance
6.Machine Tools and Metalworking
#Tungsten Carbide (WC): Milling cutter, drill, cutting tip and mould production
#It is indispensable in terms of hardness and wear resistance
Advantages
- Extremely High Melting Point: It is unrivalled for applications above 3000 °C.
- High Density: It is ideal for radiation shielding, counterweights and kinetic energy ammunition.
- Temperature Stability: It provides long-term stability especially in vacuum environments.
- Electrical and Thermal Conductivity: It shows effective performance in heat and electron transfer.
- Wear and Corrosion Resistance: It is very high especially in tungsten carbide forms.
Disadvantages
- Difficult Machinability: Because of its high hardness and brittleness it is not suitable for machining. It requires sintering.
- Bulky and Brittle: Pure tungsten in particular may show brittle behaviour under impact.
- High Cost: It is an expensive metal because of the ore extraction, purification and processing processes.
- Non-Weldability: Joining by welding is very difficult; special joining techniques are required.
Conclusion and Engineering Evaluation
At the outer limits of modern engineering it is an unrivalled material, especially in applications requiring extreme temperature, density or radiation resistance. It offers strategic solutions for environments in which most metals remain non-functional. However, because of its high cost, difficult machinability and welding difficulties, it is preferred only in projects where performance is the priority.
In this context it is , from the defence industry to nuclear technology and from space research to medical radiology an element of high engineering value used in very broad and technically critical fields.
#ASTMB760
#ASTMB777
#ASTMF288
#ISO6841
#MIL-T-21014
#UNSR07005
We supply this material
We supply Tungsten — to the ASTM B760 and ASTM B777 standards, in the dimensions and forms required. Contact us for stock availability and pricing.
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