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CPM 3V is a non-stainless powder steel best known for its high toughness. It is worth considering for an outdoor or fixed-blade knife when resistance to chipping matters more than maximum abrasive edge retention. The tradeoff is a blade that needs some rust care, along with a design and heat treatment suited to the work.
What Is CPM 3V?
CPM 3V is a powder metallurgy tool steel designed around high toughness and useful wear resistance. Its chromium content does not make it stainless. The grade is distinct from CPM CRU-WEAR and CPM 4V, which use different compositions and balances of properties.
Performance Ratings
For the science, we turn to Dr. Larrin Thomas of Knife Steel Nerds, who has kindly allowed us to share his ratings here.
| Property | CPM 3V |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore CPM 3V’s Tradeoffs
Choose a steel above to highlight its position and see all three exact ratings below. The full map fits your screen.
Non-stainless tool steel
CPM 3V
- Abrasive edge retention
- 4.5
- Toughness
- 9
- Corrosion resistance
- 5.5
All 48 rated materials. Numbers group steels at identical coordinates; colors describe stainless classification, not corrosion scores. Neither direction means a universally better knife.
CPM 3V’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Where 3V Fits as a Cutting Steel
3V has an abrasive edge-retention rating of 4.5. That puts it below CPM CRU-WEAR at 5 in this framework, while its toughness rating is higher. For a knife that mainly wears dull during long abrasive slicing sessions, another steel may suit you better. For cutting where edge damage is the more pressing concern, 3V's balance is appealing.
Our CPM CRU-WEAR profile explores the other side of this tradeoff.
Toughness and the Newer 3V Research
The published comparison framework gives 3V a toughness rating of 9. Thomas's 2025 3V study found improved toughness with the treatments he tested compared with his earlier samples. That newer work reinforces how much heat treatment matters; this profile retains the framework's published score rather than converting those test results into a new rating.
For a finished knife, consider the edge angle and blade geometry alongside the maker's treatment. A high toughness rating supports controlled cutting, not an assumption that any thin blade can withstand leverage or twisting.
Sharpening and Corrosion Care
Diamond or cubic boron nitride (CBN) abrasives are useful for sharpening 3V. Match the bevel for a touch-up and use a coarser grit when the edge needs repair. Abrasive choice and technique matter more than expecting a fixed sharpening time from the steel name.
3V is non-stainless, with a corrosion rating of 5.5. Thomas notes in his 2025 article that he had not tested its corrosion resistance, so treat that figure as an author rating, not a direct corrosion-test measurement. Clean and dry the blade after wet work and protect it during storage with an appropriate oil, particularly in humid conditions.
Choosing a CPM 3V Knife
Start with the work: the blade length, handle security and edge geometry should suit your cutting. Then consider whether you will be comfortable maintaining a non-stainless blade. 3V is a strong option when toughness is a priority, but a more corrosion-resistant steel may be more convenient for prolonged wet use. Our knife steel guide puts those choices in context.
Composition
Our steel composition guide explains what the elements do and how to read these values.
CPM 3V: Selected nominal/typical values, mass %; not a batch certificate or complete analysis. Niagara Specialty Metals: CPM 3V.
| Element | CPM 3V |
|---|---|
| Carbon (C) | 0.8% |
| Manganese (Mn) | 0.3% |
| Silicon (Si) | 1% |
| Chromium (Cr) | 7.5% |
| Molybdenum (Mo) | 1.3% |
| Vanadium (V) | 2.75% |
