We talk all the time about the different levels of the industrial metal space, and now you can see for yourself exactly where the performance materials are and where the wear materials are. So, a common challenge for buyers across the globe, and designers of all sorts of systems and products, is what we call the “thermal ceiling”. They design incredible products and components, with all sorts of properties – and then they encounter temperature conditions where the material behaves in unintended and often unsuitable ways – from arcing, to having components erode or fail under the forces of rocket thrust, or having them ‘melt out’ when they experience too much kinetic friction. A failed material, under these types of conditions, means certain ruin – from grounded aircraft to idle production lines. The element that sits above them all is the one with the highest thermal resistance on the Periodic Table of Elements. Knowing that the melt temperature of Tungsten is the bar that all performance materials are measured by is what really unlocks designing “Impossible” products and systems.
The Record-Breaking Reality of the Tungsten Melt Temperature
Whenever thermal limits of any material are in discussion, tungsten (W) surely needs special mention. Its tungsten melt temperature is recorded as 3422°C or 6191°F, which is almost double the melt temperatures of all standard industrial steel grades.
Because of this extreme threshold, tungsten is solid at temperatures where almost every other structural metal is liquid or vapor. Here are a few key metals in context and their melting points relative to tungsten:
| Metal Type | Symbol | Melting Point (°C) | Melting Point (°F) |
|---|---|---|---|
| Tungsten | W | 3,422°C | 6,191°F |
| Tantalum | Ta | 3,017°C | 5,463°F |
| Molybdenum | Mo | 2,623°C | 4,753°F |
| Platinum | Pt | 1,768°C | 3,214°F |
| Iron (Pure) | Fe | 1,538°C | 2,800°F |
| Steel (Carbon) | – | ~1,425°C – 1,540°C | ~2,600°F – 2,800°F |
Tungsten Melt Temperature vs. Melting Point of Copper
Copper is the standard material for conductivity in the fields of electrical engineering and heat management. However, the melting point of copper is only 1,085°C (1,984°F). That is more than 2,300 degrees less than the melting point of Iridium and up to 1,500 degrees less than that of Osmium.
In high-power applications, like X-ray targets or high-voltage switchgear, engineers often make a composite material choice. In this case, the material carries currents and therefore requires good conductivity, typically provided by copper. The high resistance spot must then be provided with tungsten.
| Material | Specific Heat (J/g·°C) | Melt Temp (°C) | Thermal Behavior |
|---|---|---|---|
| Aluminum | 0.900 | 660°C | Absorbs more energy before heating up |
| Tungsten | 0.132 | 3,422°C | Heats up quickly but remains solid |
| Steel | ~0.490 | ~1,500°C | Moderate energy absorption |
Tungsten has a very low specific heat, meaning it requires very little energy to raise its temperature. Combined with its massive density and the high tungsten melt temperature, it acts as a very efficient thermal conductor in high-density applications.
Machining and the Tungsten Melt Temperature
So here’s the thing: the very properties that make tungsten a valuable element — its hardness, and its extreme tungsten melt temperature — make it really, really hard to machine. Take your run of the mill (no pun intended) CNC machine and a regular end mill — something that will cheerfully bore out brass or mild steel all day long with nary a whisper of protest — and put them up against the tungsten carbide of an artisan’s pocket knife and watch as they smash, or perhaps melt into a puddle of ruin like they’re made of plastic or something. Yeah, that’s what trying to machine tungsten is like.
Almost all tungsten products are made by the powder metallurgy technique, which involves pressing tungsten powder into the required form and then heating in a hydrogen atmosphere. They are then sintered at a very high temperature – near but not quite at the melt temperature of tungsten.
The Role of Tungsten in Surpassing the Steel Melting Temperature
In the world of heavy machinery and tooling, the term you’ll hear used again and again is “High-Speed Steel” or HSS. High-Speed Steel is a type of steel that has been “doped” with tungsten. The addition of tungsten to the mixture doesn’t cause the melting point of the steel to change all that much, but what it does do is change the red-hardness of the tool into something more usable.
| Steel Grade | Typical Tungsten Content | Red-Hardness Property |
|---|---|---|
| Carbon Steel | 0% | Softens at ~200°C |
| HSS (M2) | 6% | Maintains hardness up to 600°C |
| HSS (T1) | 18% | Superior cutting endurance at high speeds |
Using a Color Guide to Copper, Brass, and Bronze for Sourcing
It can be quite a challenge to easily recognize tungsten in a scrap yard or mixed metal warehouse. While a color guide to copper, brass, and bronze can highlight the wide range of reds, yellows, and golds within these groups of alloys, tungsten has a dull, steely grey appearance.
Color is not the definitive test for tungsten. We mentioned before that tungsten’s density is almost the same as gold’s, 19.3 g/cm³ to be exact. So if you have a grey metal bar that feels as heavy as gold, we can safely assume it’s tungsten. And as we know, a handheld torch can’t reach the melting temperature of tungsten, so the bar will not melt.
High-Vacuum Applications and Vapor Pressure Near the Tungsten Melt Temperature
Material evaporation is indeed a so-called “pain point” in the lighting as well as in the semiconductor industry. What in other circumstances could be called “melting” is really the evaporation of metals when heated. Actually, it is a handful of materials that evaporate readily. With tungsten, it is somewhat different since it evaporates the least. Even though heated up to temperatures only slightly off the melt temperature of the material, the vapor pressure of metals is very low, and even at high temperatures, only a few atoms are given off in a working vacuum.
Frequently Asked Questions (FAQs)
What is the exact tungsten melt temperature?
The tungsten melt temperature is 3,422°C (6,191°F), which is the highest melting point of any pure metal.
Is the tungsten melt temperature higher than that of carbon?
No. While tungsten has the highest melting point of all metals, carbon (in the form of graphite) has a higher sublimation point (approximately 3,600°C).
Why is tungsten used in welding electrodes?
Because of the high tungsten melt temperature, it can withstand the heat of an electric arc (TIG welding) without melting itself.
Can you melt tungsten at home?
No. Standard propane, not even an oxy-acetylene torch can reach it. tungsten melt temperature.
How does tungsten compare to the melting point of copper?
The melting point of copper is 1,085°C, meaning tungsten can withstand over three times the heat load that would liquefy copper.
References
- Plansee Group. (2024). Properties and Applications of Refractory Metals.
- International Tungsten Industry Association (ITIA). (2023). Tungsten: Properties, Chemistry, and Metallurgy.
- Lide, D. R. (2022). CRC Handbook of Chemistry and Physics, 103rd Edition.
- Shedd, K. B. (2023). U.S. Geological Survey Mineral Commodity Summaries: Tungsten.
- ASM International. (2021). Specialty Steels and Hard Materials Handbook.
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