Found old tooling and wondering whether it is tungsten carbide? This guide covers the look, feel, weight, magnet and spark tests, common carbide items, frequent mix-ups, and exactly what to photograph so Ironcrest can evaluate your material.
Tungsten carbide is not a coating and not a type of steel. It is a composite material, usually called cemented carbide: extremely hard tungsten carbide powder particles fused together with a small amount of metallic binder, most often cobalt, under high heat and pressure. The result is a solid, dense material that ranks just below diamond in hardness and far above any steel. That is why it is used where cutting edges and wear surfaces take punishment: lathe and mill tooling, mining and drilling components, punches, dies, and wear parts.
Carbide carries real recovery value because tungsten itself is a scarce, expensive metal. Recyclers process carbide scrap to reclaim the tungsten content. The value of any given lot depends on its tungsten content, the grade mix, and how clean and well-sorted it is — which is why identification and sorting matter before anything is weighed or evaluated. Ironcrest does not publish blanket prices; send photos for today’s price once you have identified what you have.
Carbide has a few physical signatures that, taken together, are hard to mistake once you have handled it. No single trait is proof on its own — use them in combination.
Most carbide is a dull steel-gray to silver-gray, sometimes with a slightly grainy or matte texture. Brazed carbide tips on saw blades and router bits show as silver-gray pads against a darker steel body. Do not rely on color alone: coatings, coolant stains, and rust on attached steel can all mislead you.
This is the giveaway. Carbide is roughly twice as dense as steel (about 14–15 g/cm³ versus steel’s 7.8). Pick up a solid carbide end mill and it feels surprisingly, almost unnaturally heavy for its size. If a tool “feels too heavy,” that is one of the strongest field signals you have.
A standard steel file will bite into steel and high-speed steel but will skate across carbide almost without marking it. Carbide is also brittle: instead of bending, it chips and cracks. Worn inserts frequently show chipped cutting edges rather than smooth wear, which is normal and does not destroy their value.
Dropped on a hard surface, carbide rings with a high, clear “tink” compared with steel’s duller clunk — a useful quick check, though it can chip the piece, so do it gently and only with expendable scrap.
You do not need a lab to separate carbide from lookalikes. Three shop-floor tests — magnet, file, and spark — will correctly sort the large majority of mixed tooling.
Hold a magnet to the piece. Cemented carbide is effectively non-magnetic: the magnet will not stick. Some high-cobalt grades show a faint attraction, but it is far weaker than the strong grab you get from steel or high-speed steel. Run a magnet through a mixed bucket first and pull out everything that sticks — what stays behind is your carbide candidate pile. This single test is the fastest sorter most sellers will ever need.
Draw a standard metal file firmly across an inconspicuous area. On steel or high-speed steel the file bites and cuts; on carbide it skates across with barely a mark. Test on scrap, not on tooling you might want to keep, and keep fingers clear of the file’s path.
Touched lightly to a grinding wheel, carbide throws short, dull reddish-orange sparks with almost no branching. High-speed steel throws long, bright white-yellow sparks that fork and burst. Wear eye protection, keep the contact brief, and do not breathe the dust. The difference is obvious once you have seen both.
Combine the tests: non-magnetic + unusually heavy + file skates + short dull sparks = carbide with high confidence. If a piece is magnetic, it is steel-based — high-speed steel, tool steel, or plain steel — regardless of how it looks.
Carbide shows up in machine shops, maintenance departments, estates, and old toolboxes in recognizable forms. Learn these and you will spot carbide at a glance:
Brazed assemblies (carbide tip on a steel body) are still worth evaluating, but the attached steel affects the net carbide content — keep brazed items in their own pile rather than mixing them with solid carbide. See our carbide inserts page and main carbide buying page for what Ironcrest reviews.
These are the materials most often confused with carbide. Sorting them out correctly protects your price, because steel-based tooling has far less recovery value:
The number-one confusion. HSS drills, end mills, and taps are steel-based, magnetic, and lighter than carbide. The gold-colored titanium-nitride coating on many HSS tools fools people — gold color means coating, not carbide. Magnet test settles it instantly.
“Cobalt” drill bits are still steel (with a small cobalt addition), still magnetic, and still steel-valued. Do not confuse them with the cobalt binder inside cemented carbide.
Titanium is non-magnetic like carbide, but it is dramatically lighter — it feels almost aluminum-light in the hand. If a non-magnetic piece feels light, it is not carbide.
Ceramic cutting inserts are very light, often white, black, or pink, with a non-metallic look and feel. They contain no recoverable tungsten and are not carbide scrap.
Tool holders, boring bars, and insert seats are steel — magnetic and heavy-looking but steel-valued. Only the insert or tip seated in them is carbide. Separate the two when you can.
Cobalt-chromium hardfacing alloys are a different material family with a different recovery path. If you have welded hardfacing or stellite-tipped parts, photograph them separately and ask.
Not all carbide is identical. Manufacturers tune the tungsten grain size and the cobalt binder percentage for different jobs, and the industry uses grade codes to describe those recipes. You do not need to memorize the systems — just know what you are looking at and keep grades separated.
US C-grades (C1–C8): a rough spectrum where lower numbers generally suit wear, impact, and mining use and higher numbers suit precision cutting. ISO grades use letters for the workpiece family — K for cast iron and non-ferrous, P for steel, M for stainless — followed by numbers. Maker stamps from companies like Kennametal, Sandvik, Iscar, Valenite, Seco, Mitsubishi, and Tungaloy often appear on inserts, boxes, and tool shanks. A grade code tells a buyer the approximate tungsten-to-binder ratio and grain structure, which affects recovery value — so photograph any markings you find rather than wiping them off.
Practical rule: keep marked, boxed, or labeled tooling separate from unmarked mixed scrap, and keep inserts apart from round tools and brazed tips. A sorted lot with visible grade information is always easier to evaluate than a mystery bucket, and it is worth the small effort. When in doubt, send photos for today’s price and let the markings in the pictures do the talking.
Inherited a toolbox, bought a shop lot, or cleaning out a tool room? Work through this sequence — it takes minutes and meaningfully improves any evaluation:
Shops that generate carbide regularly can go further with a dedicated collection setup — our mail-in carbide program covers smaller sorted lots, and the carbide pricing guide explains what drives value once material is identified.
Good photos let Ironcrest identify your material without a site visit. Before you email or call, take these shots:
Photograph the whole lot at once with something for scale — a coin, a ruler, or your hand. This shows quantity and overall mix at a glance.
Get sharp close-ups of any stamps, grade codes, maker names, box labels, or part numbers. These are the single most useful photos for identification.
Lay out a few typical pieces — an insert, an end mill, a brazed tip — and photograph them clearly from a couple of angles so the form and condition are visible.
Along with the photos, include the approximate weight of each sorted pile, the tool types, any markings you could read, your city/state, and where the material came from (shop cleanout, estate, maintenance department — general context is fine). Send photos, estimated weight, tool type, markings, and location for today’s price. Email sjohns@ironcrestindustrialsurplus.com or call 312-880-8174.
Essentially no. Cemented carbide is effectively non-magnetic, so a magnet will not stick to it. Some high-cobalt grades show a very faint attraction, but it is far weaker than the strong pull of steel or high-speed steel. If a magnet grabs the piece firmly, it is steel-based, not carbide.
Use three checks together: the magnet test (carbide is non-magnetic, HSS is strongly magnetic), the weight test (carbide feels roughly twice as heavy as a similar-size steel tool), and the spark test (carbide gives short dull-red sparks; HSS gives long bright branching sparks). Gold-colored coatings do not indicate carbide — that is usually a titanium-nitride coating on HSS.
Yes. Carbide’s value comes from its tungsten content, not from being usable as a tool, so chipped inserts, snapped end mills, and worn-out burrs still have recovery value. Keep broken and worn pieces sorted by form, free of steel and debris, and photograph the lot — then send photos for today’s price.
Carbide-tipped saw blades, router bits, and brazed tooling are worth evaluating, but the steel blade or shank attached to the carbide tip affects the net carbide content. Keep brazed items in their own pile, separate from solid carbide, and photograph both the tips and the overall assembly.
Send a wide shot of the whole lot with something for scale, sharp close-ups of any stamps, grade codes, maker names, or box labels, and clear photos of a few representative pieces from different angles. Include the approximate weight, tool types, your city/state, and where the material came from. Email sjohns@ironcrestindustrialsurplus.com or call 312-880-8174.
Send photos, estimated weight, tool type, markings, and location for today’s price. Email sjohns@ironcrestindustrialsurplus.com or call 312-880-8174.
Industrial equipment can be worth more intact than as scrap. Clear photos and nameplates help determine whether resale, component recovery or commodity recovery is the best path.
Photograph the material, nameplates and quantity, then send them through the quote form, by email or by phone.
We review what the material is, its condition and quantity, and whether it fits a direct purchase.
For qualifying material, we discuss a direct purchase offer and the next steps.