Cobalt-chromium alloy powders are chosen when parts need to resist wear, corrosion, or both under demanding service conditions. In additive manufacturing, CoCrMo and CoCrW remain relevant for medical, industrial, and tribology-driven applications where stainless steel may not be sufficient.
CoCrMo and CoCrW powder grade data
Typical partner-plant datasheet limits, wt.% (the quoted lot COA governs). Grade pages: CoCrMo · CoCrW / CoCrMoW.
| Element | CoCrMo | CoCrW (CoCrMoW) |
|---|---|---|
| Co | Balance | Balance |
| Cr | 27.0–30.0 | 24.5–28.5 |
| Mo | 5.0–7.0 | 4.5–6.5 |
| W | — | 4.0–6.0 |
| C | ≤0.35 | ≤0.35 |
| Si | ≤1.0 | ≤2.0 |
| Mn | ≤0.3 | ≤1.0 |
| Fe | <0.75 | <0.5 |
| O | <0.08 | <0.1 |
| N | <0.15 | <0.2 |
| PSD cuts | 15–45, 15–53, 45–106 µm | 15–45, 15–53 µm |
Which standards relate to which use:
- Implant-route CoCrMo — the Co-28Cr-6Mo (UNS R30075) family: ASTM F75-23 for implant castings and casting alloy, and ASTM F3213-17(2025) for PBF components, whose chemistry is stated to be similar to F75 and wrought F1537. These define material or part requirements; device approval stays with the manufacturer.
- Dental restorations — ISO 22674:2022 for dental metallic materials, and ISO 9693:2026 for metal-ceramic compatibility, which applies only to a tested metal-ceramic combination. See the dental cobalt chrome powder guide.
- Industrial wear parts — usually specified by chemistry, hardness and a wear or corrosion test agreed for the part.
Why CoCr systems stay relevant
Their value comes from a combination of passivation, hot hardness, and wear-related microstructural behavior. That makes them suitable for parts facing sliding contact, corrosive media, or surface-durability requirements.
That relevance shows up in three common AM conversations:
- dental and medical hardware
- industrial wear components
- parts that need a stronger wear/corrosion answer than stainless steel
The project usually arrives at cobalt chrome because the service condition has already ruled out easier metals.
Why the alloy family alone is not enough
Teams sometimes request “cobalt chrome powder” as if that is already a complete specification. It is not. In practice, the useful question is whether the job is driven by wear, corrosion, medical handling, or a combination of those factors.
With CoCr systems, the alloy name gets attention, but the application logic closes the decision. The part function and service condition matter more than the alloy label by itself.
If the application is dental crowns, bridges or partial-denture frameworks, the dental cobalt chrome powder guide (CoCrMo and CoCrW for LPBF) is the most relevant next page.
If the part is a wear-critical industrial component—or the real question is whether cobalt chrome should replace stainless—continue with the CoCrMo versus stainless wear-hardware guide. Define the mating surface, load, motion, corrosion environment, finishing, and wear-test basis.
CoCrMo and CoCrW must remain distinct
“Cobalt chrome powder” is a family description, not a complete purchase specification. CoCrMo and CoCrW compositions, referenced standards, intended applications, heat treatments, and acceptance routes can differ. The RFQ should name the exact alloy designation and chemistry limits rather than allow the family label to substitute for identity.
| Powder route | Typical decision driver | What must be verified |
|---|---|---|
| CoCrMo for industrial wear hardware | Sliding or contact wear combined with corrosion | Exact chemistry, build and heat-treatment route, surface finish, wear and corrosion test basis |
| CoCrMo for dental or medical production | Fit, repeatability, finishing, and device workflow | Governing material/device requirements, contamination control, cleaning, biocompatibility and regulatory route |
| CoCrW or another cobalt-chromium grade | Project-specific wear, temperature, dental, or industrial requirements | Alloy designation, composition, referenced specification, process compatibility and final evidence |
| Stainless alternative | Moderate wear with corrosion and lower material/process burden | Whether wear severity actually justifies cobalt alloy selection |
Pump sleeves, valve seats, and general wear parts
Pump sleeves, valve-seat components, guide hardware, and other wear-critical parts share a wear-and-corrosion material-selection problem. CoCrMo becomes credible when sliding, rubbing, fretting, or repeated contact occurs in an environment where corrosion also matters. It should not be selected merely because “cobalt chrome is hard.”
Define the counterface, contact pressure, motion, lubricant or process fluid, temperature, debris tolerance, and required surface condition. Printed near-net geometry can reduce machining in a difficult alloy, but critical wear surfaces normally still require controlled machining, grinding, or polishing. The build surface is not automatically a finished bearing or sealing surface.
When corrosion dominates and wear is secondary, a stainless or nickel route may be more economical and easier to qualify. Use the wear-system comparison above to separate those cases.
Powder evidence and finished wear evidence
Request lot chemistry, PSD method, morphology, powder condition, contamination control, packaging, and traceability. For wear-critical service, also define the heat treatment, hardness or microstructure target, surface-finish route, dimensional tolerance, and the wear or corrosion test that represents the actual service.
A powder COA cannot establish pump life, valve leakage, wear rate, galling resistance, or corrosion allowance. Those results belong to the printed, heat-treated, finished, and tested component. The quote should make the boundary visible so a generic powder certificate is not mistaken for application approval.
RFQ checklist
State the exact cobalt-chromium grade, manufacturing process, target PSD, quantity, application, mating material, service fluid, temperature, surface requirement, and required documents. Ask for the available COA, TDS/SDS, PSD report, and SEM or morphology evidence. Dental work should stay on the dedicated dental route above because its acceptance basis differs from industrial wear hardware.