Is M390 Steel Good for Knives?

Bohler M390: The Premium Powder Steel Standard

Bohler M390 has earned a position as one of the most respected and sought-after knife steels in the world. Manufactured by the Austrian steel maker Bohler-Uddeholm using their proprietary "Microclean" powder metallurgy process, M390 represents what many enthusiasts consider the gold standard for premium production knife steels. It appears in knives from Benchmade, Spyderco, WE Knife, Microtech, and dozens of other premium manufacturers.

But premium steels come with premium prices. M390 knives typically cost $200-$400 or more, significantly more than knives made with standard stainless steels. This article examines whether M390 actually delivers performance commensurate with its price, where it excels, where it falls short, and whether it should be on your shortlist for your next knife purchase.

What Is M390?

M390 is a third-generation powder metallurgy stainless tool steel originally developed for industrial applications — specifically the manufacturing of plastic injection molds and cutting tools for processing abrasive materials. Bohler engineers designed M390 to address the limitations of conventional stainless tool steels: providing exceptional wear resistance while maintaining the corrosion resistance needed for food-contact applications.

The "third-generation" designation refers to the powder metallurgy process used in production. First-generation steels were ingot-cast (melted and poured into molds). Second-generation introduced powder metallurgy with limited refinement. Third-generation steels like M390 use highly refined powder metallurgy with precise particle size control, advanced sintering, and sophisticated alloy formulations that produce extremely uniform microstructures.

M390 Composition

The chemical composition of M390 explains its impressive performance characteristics:

• Carbon: 1.90% — provides primary hardness
• Chromium: 20.0% — exceptional corrosion resistance
• Vanadium: 4.0% — forms hard vanadium carbides for wear resistance
• Tungsten: 0.6% — adds wear resistance and high-temperature stability
• Molybdenum: 1.0% — improves toughness and hardenability
• Manganese: 0.30% — improves hardenability
• Silicon: 0.70% — improves heat treatment response

The most distinctive feature of M390's composition is its high chromium content (20%). This is significantly higher than most knife steels (typical stainless steels contain 13-17% chromium). The high chromium provides outstanding corrosion resistance — better than virtually any other knife steel currently in production. Combined with the high vanadium content for wear resistance, M390 achieves a balance of properties that was difficult to obtain before powder metallurgy techniques matured.

Performance Characteristics

Edge Retention

M390's edge retention is exceptional, ranking among the best of any production knife steel. In comparative cutting tests by independent reviewers, M390 has consistently outperformed even other premium steels like S30V, S35VN, and CPM-154. Users typically report being able to cut through significantly more cardboard, rope, or other test materials before noticing edge degradation compared to lesser steels.

The exceptional edge retention comes from the combination of:

• High vanadium content (4%) creating hard vanadium carbides
• Uniform carbide distribution from the powder metallurgy process
• Higher-than-average hardness (typically 60-62 HRC)
• Fine-grained microstructure that maintains edge geometry

In practical terms, this means an M390 knife will hold a usable working edge for weeks of daily EDC use. For most users, the edge retention is so good that they sharpen their M390 knives only a few times per year — even with regular use.

Corrosion Resistance

This is where M390 truly stands out. Its 20% chromium content provides corrosion resistance that's simply better than any other knife steel commonly used in production. M390 will resist:

• Salt water exposure (excellent for marine environments)
• Acidic foods (no concerns about prolonged contact with citrus, tomatoes, etc.)
• Sweat and skin oils (ideal for daily EDC carry)
• Most chemicals encountered in normal use
• Humidity and atmospheric moisture

For users in coastal or humid climates, or those who carry their knives in pocket alongside other items, M390's corrosion resistance is genuinely valuable. You can essentially treat M390 like the most corrosion-resistant stainless steels while still getting the edge retention of high-end carbon steels — a combination that was impossible before powder metallurgy.

Toughness

M390's toughness is good but not exceptional. It falls in the middle range of premium steels — better than ultra-hard steels like ZDP-189 but not as tough as steels specifically designed for impact resistance like CPM-3V or S35VN. In practical terms:

• M390 handles normal EDC tasks without chipping or breaking
• It can chip if subjected to lateral stress or hard impacts
• It's not the best choice for hard-use applications like batoning or prying
• For most users (95%+ of EDC scenarios), the toughness is more than adequate

If your primary concern is toughness for hard-use applications, steels like CPM-3V, S35VN, or M4 may serve you better. For typical EDC and kitchen use, M390's toughness is perfectly adequate.

Sharpening Characteristics

M390 is significantly more difficult to sharpen than budget steels due to its high vanadium carbide content. The vanadium carbides are harder than most sharpening media — meaning standard ceramic stones may struggle to remove material effectively. To sharpen M390, you'll want:

• Diamond stones: The most effective option (DMT, EZE-LAP, or similar)
• CBN stones: Cubic Boron Nitride is also effective
• High-quality ceramic stones: Spyderco's higher-grit options can work
• Avoid soft Arkansas stones: They won't cut effectively

Plan on spending 30-45 minutes on a full sharpening session for M390, compared to perhaps 15-20 minutes for an easier-to-sharpen steel. However, the trade-off is that you'll need to sharpen M390 less often. For users who own quality sharpening tools and don't mind investing the time, this isn't a significant issue.

M390 in Production Knives

M390 has been adopted by virtually every major premium knife manufacturer:

• Benchmade: Premium variants of the Bugout, Bailout, Anthem, and other models
• Spyderco: Sprint runs and exclusive variants of popular models
• WE Knife / Banterian: Standard option in many of their premium folders
• Microtech: Premium OTF automatic knives
• Hogue: Select premium models
• Kizer: Their flagship offerings
• Custom makers: Increasingly popular among individual knife makers

The widespread adoption of M390 across so many manufacturers is a strong testament to its capabilities. When dozens of premium brands all choose the same steel, you can be confident the steel is delivering real performance benefits.

M390 vs. Similar Steels

Several other premium steels are similar to M390 in performance and applications:

These steels (M390, 20CV, 204P, RWL-34) are sometimes called "the M390 family" or "the 20% chromium powder steels." They're nearly identical in performance, and most users couldn't distinguish them in blind testing. The choice often comes down to availability and the specific knife model you want.

M390 vs. Other Premium Steels

Hardness and Heat Treatment

M390 is typically heat-treated to a hardness of 60-62 HRC in production knives. This sweet spot balances:

• Edge retention (higher hardness = longer edge life)
• Toughness (lower hardness = better impact resistance)
• Sharpenability (lower hardness = easier to sharpen)

Some premium custom makers will heat treat M390 to 62-64 HRC for absolute maximum edge retention, but this comes at the cost of toughness and sharpenability. For most users, the standard 60-62 HRC range is ideal.

Heat treatment quality varies significantly between manufacturers. Premium brands like Benchmade, Spyderco, and Chris Reeve invest heavily in optimal heat treatment, while some budget manufacturers may not extract maximum performance from the steel. When buying an M390 knife, the manufacturer's heat treatment expertise matters as much as the steel itself.

Real-World Use Cases

EDC (Everyday Carry)

M390 excels in EDC applications. The combination of edge retention and corrosion resistance means you can carry an M390 knife daily, use it for typical cutting tasks, and not worry about either edge degradation or rust formation. For users who carry their knife in their pocket alongside coins, keys, and other items, M390's corrosion resistance prevents the surface staining and pitting that affects lesser steels.

Kitchen Use

M390 makes an excellent kitchen knife steel for cooks who appreciate premium materials. The corrosion resistance handles the rigors of food preparation perfectly, while the edge retention means less time spent sharpening between cooking sessions. The main drawback for kitchen use is the difficulty of sharpening — but this is mitigated by the fact that you'll need to sharpen far less often.

Outdoor and Survival

M390 performs well for outdoor applications, particularly in wet or humid environments where corrosion resistance is valuable. However, for serious bushcraft and survival applications involving batoning or hard prying, M390's moderate toughness suggests other steels (CPM-3V, S35VN) might be better choices. For lighter outdoor use — camping, hiking, fishing — M390 is excellent.

Tactical and Self-Defense

For tactical use where you want maximum edge retention and corrosion resistance, M390 is among the top choices. Premium tactical folders frequently feature M390 for these reasons. Just be aware that the harder steel can chip on hard impacts, so it's not the best choice if you anticipate using the blade against bone or similar hard targets.

Is M390 Worth the Premium?

The honest answer depends on what you value:

M390 Is Worth the Premium If You:

• Use your knife daily and value not having to sharpen frequently
• Carry your knife in environments where corrosion resistance matters (coastal, humid, sweaty)
• Own quality sharpening equipment (diamond stones)
• Appreciate the engineering and materials science behind premium steels
• Plan to keep the knife for many years
• Want the best performance available without the absolute extreme of newer steels

M390 May Not Be Worth It If You:

• Use your knife only occasionally
• Don't have quality sharpening tools
• Tend to be hard on knives (batoning, prying)
• Prioritize toughness over edge retention
• Are budget-conscious — quality steels like S35VN cost less and perform nearly as well
• Already own knives with adequate steels for your use

The Future of M390

M390 has been one of the dominant premium knife steels for over a decade, but newer steels like Magnacut are beginning to challenge its position. Magnacut offers similar corrosion resistance with potentially better toughness, while maintaining excellent edge retention. However, M390 has the advantage of widespread availability and proven track record.

For now, M390 remains a top-tier choice for premium production knives. It's likely to remain a popular option for years to come, even as newer steels enter the market. Many manufacturers continue to offer M390 alongside newer alternatives, recognizing the steel's proven excellence and customer demand.