🪙 TUNGSTEN
Tungsten Casting: Why the 3,400 C Melting Point Rules It Out
Let us be direct, tungsten is essentially never cast in the conventional foundry sense, and any buyer asking for cast tungsten needs the honest answer up front. Tungsten melts at 3,422 C, the highest of any metal, hot enough that there is no practical crucible or mold that survives molten tungsten, and it oxidizes catastrophically in air at high temperature. Tungsten carbide, pure tungsten, and tungsten heavy alloy (W-Ni-Fe) are all made by powder metallurgy and sintering, not casting, and understanding that is the whole point of this page.
ISO 9001AS9100ITAR
Why you cannot pour molten tungsten
Tungsten's 3,422 C melting point is the disqualifier. To cast a metal you must hold it molten in a crucible and pour it into a mold, but virtually nothing remains solid and inert at 3,400 C. Graphite reacts with tungsten to form carbides, refractory oxides soften or react, and the molten tungsten would dissolve or destroy any mold material long enough to take a shape. On top of that, tungsten oxidizes violently in air above about 400 C, forming volatile WO3 that fumes away, so even reaching melt temperature would require a perfect vacuum or inert atmosphere with no practical containment.
The one place tungsten does get melted is in tiny, highly specialized contexts, electron-beam or vacuum-arc melting of small ingots for research, and additive manufacturing where a laser melts a microscopic pool that solidifies onto a cold substrate before it can attack anything. These are not 'casting' in any production sense; they are melt-and-resolidify processes for ingots or printed parts, and even there tungsten's brittleness and cracking tendency make them difficult.
So when a drawing or RFQ says 'cast tungsten', the realistic response is to explain that tungsten parts are made by powder metallurgy, and then determine which tungsten material the buyer actually needs. The conversation should pivot immediately from 'how do we cast this' to 'this is a sintered or pressed-and-sintered part, and here is how those are made and what they cost.' Pretending tungsten can be sand or investment cast wastes everyone's time.
How tungsten parts are really made: press, sinter, and infiltrate
Tungsten and its alloys are produced by powder metallurgy. Fine tungsten powder (often produced by hydrogen reduction of tungsten oxide) is pressed into a compact, in a die, by cold isostatic pressing, or by injection molding for complex small shapes, then sintered at very high temperature (1,800 to 2,500 C in hydrogen or vacuum) to bond the particles into a dense solid. Pure tungsten reaches 95 to 99 percent density this way and is then often hot-worked (rolled, swaged, forged) to close remaining porosity and improve ductility, because as-sintered tungsten is brittle.
Tungsten carbide (the WC-Co cemented carbide of cutting tools and wear parts) is made by mixing tungsten carbide powder with a cobalt or nickel binder, pressing it to shape, and liquid-phase sintering: the cobalt melts at sintering temperature and wets and bonds the hard WC grains, producing a composite that is extremely hard (up to 1,600+ HV) and wear resistant. This is the only place 'melting' occurs, and it is the binder that melts, not the tungsten.
Tungsten heavy alloy (W-Ni-Fe or W-Ni-Cu, 90 to 97 percent tungsten) is the most casting-adjacent because it uses liquid-phase sintering too: the nickel-iron binder melts and infiltrates around the tungsten grains, giving a dense, machinable, high-density material (16.5 to 18.5 g/cc) with real toughness, unlike pure tungsten. Heavy alloy is the material for radiation shielding, counterweights, kinetic-energy penetrators, and balance weights, and because it contains a ductile binder phase it can be machined with carbide tooling, which pure tungsten and carbide largely cannot. The takeaway: every tungsten 'casting' question is really a powder-metallurgy question.
Choosing the right tungsten material and designing for net shape
Since you cannot cast tungsten, the design strategy is to get as close to net shape as possible in pressing and sintering, because tungsten and carbide are extraordinarily hard and can only be finished by grinding, EDM, or diamond machining, never conventional cutting. Tungsten carbide is finished almost entirely by diamond grinding and wire EDM; even a small feature change after sintering is slow and expensive. So tolerances and features should be built into the pressing tool and the green or pre-sintered (machinable) state wherever possible.
Match the material to the job. Tungsten carbide for extreme hardness and wear, cutting-tool inserts, dies, wear parts, nozzles, where you accept brittleness in exchange for the highest wear resistance. Pure tungsten for high-temperature and electrical applications, furnace elements, electrodes, x-ray targets, where the 3,422 C melting point and high density are the point, accepting that it is brittle and hard to machine. Tungsten heavy alloy (W-Ni-Fe) when you need tungsten's density (for shielding, counterweights, vibration damping in tooling, balancing) but also need toughness and machinability, the ductile binder makes heavy alloy the practical, workable choice and it is by far the most common 'tungsten part' a general buyer encounters.
Lead times and cost reflect the powder route, not casting. Tooling for pressing is a hardened die; complex shapes use metal injection molding (MIM) tooling. Sintering, optional hot working, and diamond/EDM finishing stack up. Heavy alloy parts are the most accessible, often available as sintered blanks that you machine; carbide is usually bought as standard or custom-ground tooling; pure tungsten as mill products or pressed-and-sintered shapes. For any tungsten requirement, specify the material class and the finished tolerances, and design to minimize post-sinter grinding, that, not 'casting', is how tungsten parts get made economically.
Frequently Asked Questions
No, not in any conventional or production sense. Tungsten melts at 3,422 C, the highest melting point of any metal, and there is no practical crucible or mold material that survives contact with molten tungsten at that temperature, graphite forms carbides, refractory oxides soften or react, and the melt would destroy any container. Tungsten also oxidizes violently in air above about 400 C, forming volatile oxide that fumes away, so it would have to be handled in perfect vacuum or inert atmosphere with no workable containment. The only contexts where tungsten is melted are tiny and specialized: electron-beam or vacuum-arc melting of small research ingots, and additive manufacturing where a laser melts a microscopic pool that solidifies instantly onto a cold substrate, and even those struggle with tungsten's brittleness and cracking. None of that is casting. Instead, every tungsten part, pure tungsten, tungsten carbide, and tungsten heavy alloy, is made by powder metallurgy: tungsten powder is pressed to shape and sintered at high temperature to bond the particles into a dense solid. So if your requirement says 'cast tungsten', the right move is to redefine it as a pressed-and-sintered or liquid-phase-sintered powder-metallurgy part and choose the appropriate tungsten material for the application. A supplier offering to sand or investment cast tungsten does not understand the material.
By powder metallurgy in three main routes depending on the material. Pure tungsten: fine tungsten powder is pressed into a compact (in a die, by cold isostatic pressing, or by injection molding for complex small parts) and sintered at 1,800 to 2,500 C in hydrogen or vacuum to bond the particles; because as-sintered tungsten is brittle, it is often hot-worked, rolled, swaged, or forged, to close porosity and improve ductility, yielding mill products like rod, sheet, and electrodes. Tungsten carbide (cemented carbide): tungsten carbide powder is blended with a cobalt or nickel binder, pressed to shape, and liquid-phase sintered, the binder melts and bonds the hard carbide grains into an extremely hard, wear-resistant composite used for cutting tools, dies, and wear parts. Tungsten heavy alloy (W-Ni-Fe or W-Ni-Cu, 90 to 97 percent tungsten): also liquid-phase sintered, where a nickel-iron binder melts and infiltrates around tungsten grains to produce a very dense (16.5 to 18.5 g/cc) yet tough and machinable material for shielding, counterweights, and balance weights. In all three, finishing on the hard tungsten and carbide materials is done by diamond grinding and EDM, not conventional machining, so parts are pressed as close to net shape as possible. The practical answer to 'how do I get a tungsten part' is to pick the material class and source it from a powder-metallurgy supplier, not a foundry.
Tungsten heavy alloy (often W-Ni-Fe or W-Ni-Cu, typically 90 to 97 percent tungsten) is a liquid-phase-sintered material that combines tungsten's extreme density with usable toughness and machinability, which makes it the most practical tungsten material for most engineering buyers. It is made by pressing tungsten powder with a small fraction of nickel-iron (or nickel-copper) binder and sintering so the binder melts and infiltrates around the tungsten grains, producing a fully dense part at 16.5 to 18.5 g/cc, roughly twice the density of steel and about 60 percent denser than lead. Unlike pure tungsten and tungsten carbide, which are brittle and can only be ground or EDM'd, the ductile binder phase in heavy alloy gives it real toughness and lets it be machined with carbide tooling much like a hard steel, you can turn, mill, drill, and tap it. That combination of extreme density plus machinability makes heavy alloy the go-to for radiation shielding (its density blocks x-rays and gamma rays in compact form), counterweights and balance weights in aircraft and machinery, vibration-damping tool holders and boring bars (the mass kills chatter), kinetic-energy penetrators and military ordnance (often ITAR-controlled), and high-density inertial components. It is frequently sold as sintered blanks that the customer machines to final shape. When someone needs 'a dense tungsten part', heavy alloy is almost always the right and most accessible answer.
The strategy is to build features into the powder-pressing tool and the pre-sintered state, because finishing fully sintered tungsten and carbide is limited to grinding and EDM, which are slow and costly. Tungsten carbide and pure tungsten are far too hard to machine with conventional cutting tools, so after sintering they are finished by diamond grinding (for flats, bores, and profiles), wire and sinker EDM (for complex shapes and internal features), and lapping or polishing for precision surfaces. This means every post-sinter feature is expensive, so designers press the part as close to net shape as the tooling allows and, where possible, machine in the green (pressed but unsintered) or pre-sintered state when the material is still relatively soft, then sinter. Achievable as-sintered tolerances are loose (sintering shrinkage is large, often 15 to 20 percent linear, and must be predicted), so any tight tolerance, a bearing bore, a sealing face, a precise gauge dimension, is ground or EDM'd afterward to single-digit-micron precision if needed. Tungsten heavy alloy is the exception: its ductile binder lets it be machined conventionally with carbide tooling, so heavy-alloy parts can have features cut after sintering much like steel, which is another reason heavy alloy is the most workable tungsten material. The overall rule is design for net shape in pressing and reserve grinding/EDM for only the critical features on the hard grades.
Tungsten parts are expensive because the raw powder is costly, sintering is energy-intensive, and finishing the hard grades requires diamond grinding and EDM. As rough planning figures, tungsten heavy alloy runs roughly $40 to $100+ per pound for machined parts depending on size and tungsten content; tungsten carbide parts are usually priced per piece as ground tooling and can range from tens to thousands of dollars depending on size and grinding complexity; pure tungsten mill products and pressed-and-sintered shapes run $50 to $150+ per pound. Pressing tooling (a hardened die, or a metal-injection-molding tool for complex small parts) is a real upfront cost, several thousand to tens of thousands of dollars, that pushes the economics toward higher volumes unless you machine from standard sintered blanks. Lead times are typically 4 to 12 weeks depending on whether you are machining from stock heavy-alloy blanks (faster) or pressing and sintering custom shapes with diamond grinding (slower). For ITAR-controlled applications like ordnance and certain defense counterweights, add export-control documentation and qualified-supplier requirements. The cost and lead-time drivers worth interrogating are the tungsten content, the amount of post-sinter diamond grinding or EDM, the tooling for pressing, and any density or radiographic verification. Because none of this is casting, compare suppliers on their powder-metallurgy and grinding capability, not foundry capacity.
Last updated: July 2026
Find Tungsten Casting Suppliers
Search verified shops that handle Tungsten casting.
No logins. No email gates. Just results.