M390 steel stands as one of the most advanced stainless knife steels available today. This powder metallurgy marvel has earned its reputation among knife enthusiasts and professionals alike for delivering exceptional performance in the most demanding cutting scenarios. In this comprehensive guide, we’ll explore everything you need to know about M390 steel in 2026.
What is M390 Steel?
M390 steel, manufactured by Böhler-Uddeholm, is a powder metallurgy (PM) martensitic stainless steel that represents the pinnacle of modern steel technology. Originally developed for industrial applications like injection molding tools and barrels, this “super stainless steel” has found its way into high-end knife production due to its outstanding combination of properties.
The steel achieves its exceptional performance through advanced powder metallurgy processing, which creates an ultra-fine, uniform grain structure. This microclean steel can achieve a mirror-like finish while maintaining superior mechanical properties.
M390 Steel Specifications Table (2026)
| Property | Value | Rating (1-10) |
|---|---|---|
| Hardness (HRC) | 58-62 HRC (typically 61-63 in knives) | 9/10 |
| Edge Retention | Exceptional | 9/10 |
| Toughness | Moderate | 6/10 |
| Corrosion Resistance | Outstanding | 9/10 |
| Ease of Sharpening | Challenging | 4/10 |
Chemical Composition
| Element | Percentage | Function |
|---|---|---|
| Carbon (C) | 1.9-2.1% | Enables high hardness and superior edge retention |
| Chromium (Cr) | 19-20% | Provides excellent corrosion resistance and forms hard carbides |
| Molybdenum (Mo) | 0.8-1.2% | Enhances hardness and pitting resistance |
| Vanadium (V) | 0.1-0.5% | Creates ultra-hard carbides for wear resistance |
| Tungsten (W) | ~0.6% | Improves strength and toughness |
| Manganese (Mn) | 0.3-0.5% | Aids hardenability and strength |
| Silicon (Si) | 0.2-0.5% | Deoxidizer and strength enhancer |
Key Properties and Benefits
Outstanding Edge Retention
M390’s approximately 22% carbide volume (18% chromium carbides + 2.5% vanadium carbides) delivers exceptional edge retention that surpasses many competing steels. Independent CATRA testing shows M390 outperforming popular steels like S30V and S35VN in edge retention tests.
Superior Corrosion Resistance
With 19-20% chromium content, M390 offers outstanding corrosion resistance that rivals or exceeds most stainless steels. This high chromium content makes it highly resistant to atmospheric corrosion and suitable for humid environments.
Excellent Grindability
Despite its hardness, M390 maintains good machinability due to its powder metallurgy structure. This allows knife makers to achieve precise grinds and excellent surface finishes.
Wear Resistance
The fine carbide structure provides exceptional wear resistance, making M390 ideal for cutting applications where blade longevity is crucial.
M390 vs Other Premium Steels
| Steel | Edge Retention | Toughness | Corrosion Resistance | Sharpening Ease |
|---|---|---|---|---|
| M390 | Exceptional | Moderate | Outstanding | Challenging |
| S30V | Excellent | Good | Excellent | Moderate |
| S35VN | Very Good | Better | Good | Easy |
| 20CV | Exceptional | Moderate | Very Good | Challenging |
Best Knives in M390 Steel (2026)
1. LionSteel M2M Fixed Blade
Amazon Link: LionSteel M2M M390 Fixed Blade
The LionSteel M2M represents the pinnacle of Italian craftsmanship combined with M390 steel excellence. This fixed blade features:
- 3.5″ M390 steel blade with flat grind
- Premium Micarta handle scales
- 4.9 oz total weight
- Leather sheath included
- Ferro rod compatible spine
Why we recommend it: The M2M delivers exceptional cutting performance with a timeless design that excels in both outdoor and kitchen applications.
2. Geo 2502A Folding Knife
Amazon Link: Geo 2502A M390 Titanium Folder
This budget-friendly option proves that M390 doesn’t have to break the bank:
- 3.3″ M390 drop-point blade
- Full titanium handle construction
- Washer pivot system
- Reversible pocket clip
- 7.6″ overall length
Why we recommend it: Offers genuine M390 performance at an accessible price point with premium titanium construction.
3. WE Knife Anglex Flipper
Amazon Link: WE Knife Anglex M390 Tactical
For those seeking tactical excellence:
- M390 steel blade with tactical geometry
- Full titanium frame construction
- Ceramic ball bearing action
- Premium build quality
- Advanced flipper design
Why we recommend it: Represents the cutting edge of tactical folder design with M390’s superior edge retention.
Frequently Asked Questions
Is M390 steel hard to sharpen?
Yes, M390 is more challenging to sharpen than most steels due to its hard carbides. However, with proper technique and quality sharpening equipment (diamond or ceramic abrasives), excellent results are achievable.
How does M390 compare to S30V?
M390 offers superior edge retention and corrosion resistance compared to S30V, but S30V is easier to sharpen and slightly tougher. Choose M390 for maximum cutting performance, S30V for easier maintenance.
What HRC hardness should M390 be?
Most knife manufacturers harden M390 to 61-63 HRC for optimal balance of hardness and toughness. This range provides excellent edge retention while maintaining reasonable toughness for knife applications.
Is M390 worth the extra cost?
For users who prioritize edge retention and corrosion resistance and don’t mind the sharpening challenge, M390 is worth the investment. It’s ideal for precision cutting tasks and environments where blade maintenance is infrequent.
Can M390 rust?
While highly corrosion-resistant, M390 can still develop pitting in chloride-rich environments (salt water, etc.). However, it’s much more resistant than most steels and suitable for humid conditions.
What’s the difference between M390 and 20CV?
M390 and 20CV are essentially equivalent steels with nearly identical compositions. 20CV is Carpenter’s version of the same basic formula, offering similar performance characteristics.
Related Steel Articles
- What is S30V Steel? – Compare M390 to this popular Crucible steel
- What is S35VN Steel? – Explore S35VN’s balanced properties
- What is VG10 Steel? – Learn about this Japanese stainless steel
- What is D2 Steel? – Discover this tool steel’s characteristics
- Best Steel for Kitchen Knives – Complete steel guide
Conclusion
M390 steel represents one of the finest achievements in modern powder metallurgy steel production. Its exceptional edge retention, outstanding corrosion resistance, and superior wear resistance make it an excellent choice for knives where cutting performance is paramount.
While M390’s challenging sharpening requirements and higher cost may not suit every user, those who appreciate its qualities will find it delivers uncompromising performance. Whether you’re a professional chef, outdoor enthusiast, or knife collector, M390 offers cutting performance that justifies its premium status.
The steel’s continued evolution and refinement ensure that M390 will remain at the forefront of knife steel technology well into the future. For those seeking the ultimate in stainless steel performance, M390 continues to set the standard that others strive to match.