Tungsten Metal at 6,170°F
Tungsten has the highest melting point of any metal, but that single record does not make it a universal high-temperature solution. This guide explains its properties, material families, uses, processing routes and hard limits so engineers can decide when tungsten is essential—and when it is expensive overkill.
About 3,422°C
OSHA lists 6,170°F; other authoritative datasets report values around 6,177–6,192°F. The practical message is unchanged: tungsten leads all metals in melting temperature.
19.3 g/cm³
Tungsten packs almost as much mass into a volume as gold and is roughly 70% denser than lead, supporting compact shielding, ballast and counterweights.
Which “tungsten”?
Pure tungsten, tungsten heavy alloy, tungsten carbide and tungsten-rhenium solve different problems. They are not interchangeable stock descriptions.
Heat is not the only failure
Air oxidation, brittle fracture, thermal shock, joining defects and difficult machining can control a design far below the melting point.
What is tungsten metal?
Tungsten is a dense, body-centered-cubic refractory metal with atomic number 74 and chemical symbol W. It is selected when a design needs exceptional temperature capability, high elastic stiffness, a large mass in a small volume, low vapor pressure in vacuum, erosion resistance or the wear performance of a tungsten-containing hard material.
The phrase “tungsten metal” should not be used loosely. A brittle high-purity tungsten plate, a machinable tungsten–nickel–iron heavy-alloy counterweight, a cobalt-bonded tungsten-carbide cutting insert and a tungsten-rhenium thermocouple wire have different compositions, microstructures, properties and qualification routes.
The useful decision is therefore not “Is tungsten strong?” It is: Which tungsten family, product form, temperature, atmosphere, load mode and manufacturing route fit the actual failure mechanism?
Why authoritative values differ slightly
OSHA’s chemical database reports a melting point of 6,170°F. The Royal Society of Chemistry lists 3,414°C (6,177°F), while PubChem includes U.S. Department of Energy data at 3,422°C (6,192°F). Differences come from adopted reference values, measurement history and conversion or rounding—not from radically different grades of tungsten. For engineering communication, state the source and use approximately 3,422°C unless the governing data system specifies otherwise.
Melting point does not equal maximum use temperature
A tungsten part can lose function without melting. In oxygen-containing atmospheres, oxidation and volatile oxide formation can remove material. Thermal cycling can initiate cracks. Recrystallization and grain growth can change strength and shock resistance. Joints, brazes, coatings, holders and adjacent materials may also fail first.
Define the complete environment: peak and steady temperature, time at temperature, atmosphere or vacuum level, heat flux, thermal gradient, stress state, cycling, contamination, radiation and acceptable dimensional change.
Density creates value—and load
At about 19.3 g/cm³, a one-centimeter cube of tungsten has a mass of roughly 19.3 grams. That density is valuable when shielding or counterweight volume is limited. It is a liability when moving mass, inertia, supporting structure or handling cost matters. Titanium is far better when specific strength and low mass dominate.
The symbol W comes from wolfram
The element’s name is connected to the Swedish phrase for “heavy stone,” while its chemical symbol comes from wolfram. Scheelite and wolframite are the principal ore minerals. The Elhuyar brothers isolated tungsten in 1783 after work on tungstic compounds; the Royal Society of Chemistry provides a concise history and current element data.
Read the numbers with their test condition attached.
Composition, porosity, grain structure, texture, product form, rolling direction, heat treatment and temperature can change mechanical behavior. The values below are orientation data, not drawing allowables or receiving criteria.
Group 6 transition metal; chemical symbol W.
Room-temperature reference value from RSC and DOE-sourced data.
Common engineering reference; reported values vary slightly by source.
Very stiff, but stiffness is not the same as toughness.
| Property | Engineering meaning | Common misread | What to verify |
|---|---|---|---|
| Melting point | Provides extraordinary thermal headroom among metals. | Assuming the part can operate near melting temperature in air or under load. | Atmosphere, oxidation, vaporization, creep, recrystallization, thermal gradient and joining system. |
| Density | Enables compact mass, ballast and shielding. | Calling tungsten “lightweight” because a smaller volume is needed. | Total assembly mass, inertia, mount loads, radiation spectrum and shielding geometry. |
| Elastic modulus | Low elastic deflection for a given geometry and load. | Equating high stiffness with impact resistance. | Fracture toughness, notch sensitivity, grain condition, direction and service temperature. |
| Thermal expansion | Relatively low expansion supports dimensional stability and selected glass-to-metal seals. | Ignoring mismatch with copper, steel, ceramics or braze alloys. | Full temperature cycle, joint compliance, residual stress and interface geometry. |
| Thermal conductivity | Can spread heat, although copper conducts substantially better at room temperature. | Choosing tungsten as a universal heat sink. | Temperature-dependent conductivity, contact resistance, cooling route and oxidation. |
| Hardness | Tungsten and especially cemented carbide can resist wear. | Treating a single hardness value as universal across pure W, WC-Co and heavy alloys. | Phase, binder, porosity, grain size, test scale, temperature and surface condition. |
Property anchors: Royal Society of Chemistry, NIH PubChem and OSHA. Mechanical values must come from the actual material specification or supplier certificate.
Does the design really need tungsten?
This planning tool separates problems that genuinely favor a tungsten family from problems better solved by steel, nickel alloy, molybdenum, copper or titanium. It is not a material specification or qualification result.
Describe the load case
Choose the nearest requirement. The recommendation updates instantly.
Strong tungsten candidate
Extreme heat in a controlled atmosphere, combined with supported loading and powder processing, is a classic reason to evaluate pure tungsten or a qualified tungsten alloy.
“Tungsten” is not one purchasable behavior.
Select the family before discussing a grade, because binder phase, alloying and product form can change toughness, machinability, thermal performance, conductivity and joining response.
Pure tungsten
Used for filaments, furnace components, evaporation sources, electrodes, X-ray targets and selected plasma-facing or thermal hardware. It offers the headline melting point and low vapor pressure but is difficult to cast and can be brittle.
Ask for: purity, density, grain condition, orientation, product form and thermal history.Tungsten heavy alloy
Typically a high tungsten fraction with nickel-iron or nickel-copper binder phases. It is easier to machine and tougher than high-purity tungsten, making it useful for counterweights, shielding and compact kinetic or inertial components.
Ask for: tungsten fraction, binder chemistry, density, magnetic requirement and mechanical properties.Cemented carbide
Tungsten carbide grains bonded most commonly with cobalt form hardmetal cutting, drilling, mining and wear components. Its behavior is governed by WC grain size, binder content, porosity, geometry and coating—not pure tungsten data.
Ask for: ISO grade, binder, grain size, coating, toughness and wear mechanism.Tungsten-rhenium and composites
Rhenium additions can improve ductility and high-temperature response in selected wires, thermocouples and aerospace hardware. Copper-tungsten and silver-tungsten composites combine refractory phases with conductive metals for contacts and thermal duties.
Ask for: phase distribution, fabrication route, interface integrity and applicable industry specification.Ordering “tungsten carbide” when the drawing needs tungsten heavy alloy—or quoting pure tungsten properties for a cobalt-bonded insert—can invalidate weight, strength, safety, machining and inspection assumptions.
Why powder metallurgy is the normal route.
Tungsten’s extreme melting temperature makes conventional melting and casting unusually difficult. Industrial production commonly moves from ore concentrate through chemical purification, oxide reduction, powder consolidation and sintering.
Scheelite is one of the principal tungsten ores.
Its blue fluorescence under shortwave ultraviolet light is a useful identification feature, although ore evaluation still requires mineralogical and chemical analysis.
U.S. Geological Survey, public domain.The chain that defines finished behavior
Wolframite and scheelite concentrates are chemically processed toward purified tungsten compounds such as ammonium paratungstate, then converted to tungsten oxide. Hydrogen reduction produces tungsten powder. Powder size, oxygen content and agglomeration influence pressing and sintering.
Compacts are sintered or hot consolidated, then may be swaged, rolled, drawn, forged, heat treated, ground, EDM-cut or joined. Each step changes porosity, grain size, texture, residual stress and therefore fracture and thermal response.
Two parts with the same nominal tungsten purity can behave differently if one is porous and recrystallized while the other is worked, fine-grained and directionally processed.
Concentrate
Separate scheelite or wolframite from gangue and control tungsten grade plus penalty elements.
Purify
Convert concentrate into a controlled chemical intermediate and remove impurities.
Make powder
Reduce tungsten oxide—commonly with hydrogen—to form metallic powder with controlled characteristics.
Press and sinter
Create a dense body through powder compaction and high-temperature consolidation.
Work and finish
Swage, roll, draw, grind, EDM, coat or join while preserving the required grain condition and dimensions.
The failure often arrives before melting.
Successful tungsten design controls the full component system rather than celebrating one property. These are the four risks most likely to invalidate a simplistic material choice.
| Manufacturing method | Where it works | Main control | Typical trap |
|---|---|---|---|
| Powder metallurgy | Near-net shapes, billets, heavy alloys and cemented carbide | Powder chemistry, pressing, binder, sintering, porosity and shrinkage | Assuming nominal density proves a defect-free microstructure |
| Diamond grinding | Precision finishing of hard or brittle tungsten materials | Wheel, coolant, force, heat, dressing and crack inspection | Subsurface damage hidden below an attractive finish |
| Wire or sinker EDM | Complex profiles and hard stock without conventional cutting force | Energy, flushing, recast layer, heat-affected surface and finish passes | Leaving recast or microcracks on a fatigue-critical surface |
| Conventional machining | Often more practical for tungsten heavy alloys than pure tungsten | Exact grade, rigidity, tool, engagement, edge condition and coolant | Applying steel parameters to brittle pure tungsten |
| Brazing / diffusion joining | Composite assemblies and refractory-to-ductile transitions | Expansion mismatch, interface cleanliness, filler, vacuum and residual stress | Designing the parent metal while the joint controls service life |
Can tungsten be laser cut, welded or marked?
Yes—but the process window is demanding. Tungsten’s high melting temperature, high thermal gradients, brittle behavior and oxidation sensitivity require representative trials, stable shielding and careful control of geometry and heat flow.
Laser welding tungsten
Fusion is physically possible, but a visually continuous bead does not prove an acceptable joint. Rapid solidification, residual tensile stress, grain-boundary behavior, porosity, cracking and mismatch to adjacent materials must be evaluated.
- Material identity: pure W, W-Re, heavy alloy and composites require different assumptions.
- Joint design: thin foil, wire, sheet, bulk plate and dissimilar joints manage heat differently.
- Atmosphere: use qualified inert or vacuum protection; control oxygen and surface contamination.
- Thermal strategy: preheat, beam oscillation, pulse shaping, focus and travel strategy may change crack risk.
- Acceptance: inspect cross-section, fusion, cracks, pores, hardness, distortion and required service response.
Laser cutting, drilling and marking
Laser ablation and fusion cutting can produce small features without tool contact, but recast, taper, microcracks, dross and heat-affected surfaces may be unacceptable for fatigue, vacuum or precision thermal duty.
- Cutting: qualify assist gas, edge roughness, recast and crack depth—not only speed.
- Drilling: measure entrance/exit geometry, taper, redeposition and internal-wall damage.
- Marking: select contrast, depth and traceability without weakening thin or highly stressed sections.
- Cleaning: remove oxide or contamination without creating melt texture, redeposition or dimensional loss.
- Metrology: use microscopy, sectioning and functional testing appropriate to the risk.
Power alone cannot define the result. Wavelength, spot size, beam profile, pulse duration, repetition rate, focus, scan path, travel speed, shielding, thickness, restraint, surface and thermal mass all matter.
Where tungsten earns the fabrication cost.
The best applications exploit a property that cheaper materials cannot supply within the same volume, temperature, erosion rate or wear condition.
Cemented-carbide tools
WC-based hardmetals dominate many inserts, drills and wear parts because hardness and compressive strength can be balanced with binder content and grain size.
Filaments and emitters
Fine tungsten wire can operate incandescently while resisting sag and evaporation better than lower-melting metals under a controlled lamp environment.
Nonconsumable GTAW electrodes
Tungsten electrodes support a stable arc without serving as filler. Electrode composition, diameter, tip geometry, polarity and current range still require selection.
X-ray targets and shielding
High atomic number and density support X-ray production and compact attenuation, while thermal design manages the intense localized heat load.
Counterweights and ballast
Heavy alloys concentrate mass in limited space for balance weights, vibration tuning and compact inertial systems.
Plasma-facing components
ITER describes tungsten’s high melting point, sputtering threshold and low fuel retention as advantages, while also highlighting contamination and material-behavior challenges.
Tungsten carbide is not pure tungsten.
Cemented-carbide behavior comes from WC grains, binder phase, porosity, coating and edge geometry. Specify the hardmetal system, not only the element.
Mauro Cateb / Wikimedia Commons, CC BY-SA 4.0.
A famous use—now only one part of the demand picture.
Tungsten filaments illustrate high-temperature stability, but modern demand is led by cemented carbides and industrial applications.
Arnoldius / Wikimedia Commons, CC BY-SA 3.0.Application-fit questions
- What fails without tungsten? Melting, evaporation, wear, density, stiffness, erosion or radiation attenuation?
- Does the environment support it? Air, vacuum, inert gas, molten material, radiation and thermal cycling must be defined.
- Can the geometry be made? Include pressing, sintering shrinkage, machining access, joining and inspection.
- Can the part survive handling? Brittle components need controlled mounting, edge radii, packaging and assembly practice.
- Is a tungsten family being confused with another? Verify purity, binder and alloy chemistry before using property data.
- Is the supply route resilient? Qualify source, recycled-content controls, lot traceability and change notification.
Tungsten vs molybdenum, Inconel, steel and titanium.
There is no universal winner. Compare the complete failure mode, service atmosphere, mass budget, manufacturing route, approved data and total part cost.
| Material family | Relative advantage | Relative limitation | Typical decision trigger |
|---|---|---|---|
| Tungsten / W alloys | Highest metal melting point, very high density and stiffness, low vapor pressure. | Brittleness, oxidation and difficult fabrication can dominate. | Only when heat, compact mass, erosion or a tungsten-specific function is decisive. |
| Molybdenum | Refractory performance at lower density and often easier fabrication/cost position. | Lower melting point and density; still oxidation-sensitive at high temperature. | Controlled-atmosphere furnace and thermal hardware where tungsten margin is unnecessary. |
| Nickel superalloy | Better conventional fabrication, oxidation/corrosion resistance and structural alloy data. | Far lower melting point and temperature ceiling than refractory metals. | Loaded hot structures in air where creep, oxidation and code allowables dominate. |
| Tool steel | Low cost, familiar machining/heat treatment and strong structural utility. | Much lower temperature capability and density. | General tools and structures where tungsten’s unique physics are not required. |
| Ti-6Al-4V | Excellent strength-to-weight and corrosion behavior for many aerospace duties. | Low density is the opposite of compact ballast; lower temperature capability. | Mass-sensitive structures and components rather than shielding or high-density weights. |
| Copper alloy | Excellent thermal/electrical conductivity and practical fabrication. | Low hot strength and melting temperature compared with tungsten. | Heat removal and electrical duty; often combined with tungsten in a composite or assembly. |
A tungsten-copper composite, coated tungsten, actively cooled tungsten assembly or tungsten heavy alloy may outperform either constituent alone—but interfaces, residual stress and qualification become central.
Solid metal and airborne dust are different hazards.
Risk assessment must identify the exact material: pure tungsten, soluble tungsten compound, tungsten carbide, cobalt-containing hardmetal, coating, grinding debris or process fume.
OSHA’s database lists 5 mg/m³ as an 8-hour PEL for tungsten metal and insoluble compounds in Construction and Maritime, and 1 mg/m³ for soluble compounds in those sectors. Applicability and more protective limits must be reviewed for the facility, material and jurisdiction; see the linked OSHA records rather than treating these values as a universal shop target.
Use current data, not a fixed percentage forever
The 2026 USGS Mineral Commodity Summaries provide the latest comprehensive world mine-production estimates for 2025. The exact share changes by year, so a durable specification should not embed an old percentage as if it were a material property. Use the current USGS tungsten chapter for sourcing reviews.
Export policy can change the practical lead time
China introduced export controls covering selected tungsten-related items in 2025. Whether a specific product is affected depends on classification, composition, destination, licensing and current regulations. Procurement teams should verify the exact customs code and supplier route rather than relying on a headline.
Recycling is technically and strategically valuable
Cemented-carbide scrap can be reclaimed through direct or chemical routes. Segregation by grade and contamination history improves value and process control. Recycled content can support supply resilience, but aerospace, medical, nuclear or other critical applications may require specific source and impurity controls.
Qualify at least the material form, producing mill or processor, country route, lead time, minimum order, scrap/recycled-content policy, change notification, test certificate and second-source strategy.
Buy a controlled material route—not a tungsten nickname.
An effective purchase order connects the part’s failure mode to chemistry, product form, microstructure, dimensions, processing, inspection and traceability.
State pure tungsten, W-Re, heavy alloy, WC-Co, Cu-W or another system; include applicable designation and revision.
Set tungsten content, binder/alloy composition, controlled impurities and test method appropriate to the application.
Specify powder, rod, wire, sheet, plate, billet, insert or finished part, plus working direction and test orientation.
Define required density, permitted porosity, method and sampling plan; nominal composition alone does not prove consolidation quality.
Control worked, stress-relieved, recrystallized or sintered condition, grain size and thermal-history restrictions where relevant.
Choose tensile, bend, hardness, fracture, thermal cycling or erosion tests at the required direction and temperature.
Set roughness, edge condition, recast removal, crack limits, flatness, cleanliness, coating and machining allowance.
Define penetrant, ultrasonic, radiography, CT, microscopy or sectioning with acceptance criteria and specimen location.
Require powder/batch/heat identity, process route, certificates, markings and retention through machining and joining.
Identify which changes in mine source, powder, binder, furnace, process, sub-tier or recycled content need approval.
| Supplier question | Why it matters | Useful evidence |
|---|---|---|
| Is this pure W, heavy alloy or cemented carbide? | Each family has different binder, toughness, machining and thermal behavior. | Material designation, certified chemistry and microstructural route. |
| What condition will ship? | Worked, recrystallized and as-sintered material can fracture and machine differently. | Process certificate, heat-treatment record, grain-size and direction data. |
| How was density measured? | Archimedes density, theoretical density and local porosity answer different questions. | Method, sampling location, result and acceptance threshold. |
| What change requires notification? | A new powder route or binder source can change process response without changing the trade name. | Contractual change-control clause and documented supplier procedure. |
Validate the real tungsten grade, surface and geometry.
Oceanplayer can review a laser cleaning, welding, marking or automation application using representative material, dimensions, surface condition and acceptance criteria. The useful outcome is a repeatable process window—not only a visually impressive sample.
- Exact material family, grade and certificate
- Part dimensions, joint or target area
- Current surface, coating or contamination
- Required result and prohibited damage
- Inspection and service requirements
- Target cycle time and production volume
Tungsten metal FAQ
Concise answers to common questions about temperature, density, machining, oxidation and material selection.
Does tungsten really melt at 6,170°F?
6,170°F is the value in OSHA’s chemical database. Other authoritative references list about 6,177°F or 6,192°F, depending on the adopted Celsius/Kelvin value and conversion. Engineers commonly use approximately 3,422°C. The small difference does not change tungsten’s status as the metal with the highest melting point.
Is tungsten the metal with the highest melting point?
Yes. Tungsten has the highest melting point among metals. Some compounds have higher reported melting or decomposition temperatures, so “highest melting point of any substance” would be incorrect.
Is tungsten heavier than lead?
Yes. Tungsten is about 19.3 g/cm³ versus roughly 11.34 g/cm³ for lead, making tungsten around 70% denser by volume. The finished density of a tungsten heavy alloy or cemented carbide depends on its binder and porosity.
Does tungsten rust?
It does not form iron rust, but it can oxidize. At elevated temperature in oxygen-containing environments, tungsten oxides can form and the section can degrade. High melting point does not mean unlimited oxidation resistance.
Can tungsten be machined?
Yes, but route selection depends on the material family. Tungsten heavy alloys are generally more conventionally machinable than high-purity tungsten. Pure tungsten and cemented carbide often use diamond grinding, EDM, near-net powder processing or specialized cutting practices.
Is tungsten carbide the same as tungsten metal?
No. Tungsten carbide is a compound, and most industrial carbide tools are cemented composites of WC grains with a metallic binder such as cobalt. Their hardness, toughness, safety and processing cannot be predicted from pure tungsten data.
Can tungsten be laser welded?
Yes, but crack sensitivity, high thermal gradients, oxidation, porosity and residual stress require a qualified process. Material condition, joint design, thickness, preheat, shielding, beam strategy and acceptance tests must be developed on representative parts.
Is tungsten radioactive?
Ordinary tungsten metal is not treated as a radioactive material. Natural tungsten contains isotopes, including extremely long-lived isotopes, but this is not the same hazard category as depleted uranium. The applicable shop risks are more often dust, binder metals, heavy handling and process-specific fume.
Why is tungsten difficult to cast?
Its extreme melting point makes crucible, furnace, contamination and solidification control difficult. Powder metallurgy avoids fully melting the bulk material and is therefore a standard industrial route.
When should I choose molybdenum instead?
Consider molybdenum when the temperature and density requirements do not justify tungsten’s higher mass, fabrication difficulty or cost. Both are refractory and oxidation-sensitive at high temperature, so the atmosphere and actual duty still need review.
What information should a tungsten RFQ include?
Include the material family and grade, chemistry, product form, dimensions, density/porosity, grain or thermal condition, mechanical tests, surface, NDE, traceability, applicable document revisions and change-control requirements.
Can I melt tungsten with a shop torch?
No practical shop torch provides a controlled route to melt and cast tungsten. Even if a flame temperature appears numerically close, heat transfer, atmosphere, containment, contamination and full-volume melting make the comparison misleading.
Continue from material data to process planning.
Use the next resource that matches the decision: melting-point comparison, process cost, laser-welding feasibility or representative sample validation.
Primary references used.
This guide prioritizes government, institutional and scientific sources. Verify current standards, exposure requirements, trade rules and supplier data for the actual project.
- Royal Society of Chemistry — Tungsten element information, properties, uses and history.
- NIH PubChem — Tungsten element record with U.S. Department of Energy physical-property data.
- OSHA — Tungsten metal and insoluble compounds: physical properties, sampling and exposure limits.
- OSHA — Tungsten soluble compounds: exposure-limit distinctions.
- U.S. Geological Survey — Tungsten statistics, uses and publication archive.
- U.S. Geological Survey — Mineral Commodity Summaries 2026, tungsten chapter.
- U.S. Geological Survey — Scheelite identification image and description.
- U.S. Department of Energy OSTI — Mechanisms of deformation and ductility in tungsten: a review.
- NASA — Tungsten powder processing, sintering and high-temperature application research.
- ITER Organization — Tungsten as a plasma-facing material: advantages and limitations.
- James St. John / Wikimedia Commons — elemental tungsten image, CC BY 2.0.
- Mauro Cateb / Wikimedia Commons — tungsten carbide inserts, CC BY-SA 4.0.