Böhler K390 is a powder tool steel that combines very high wear resistance with surprising toughness. Spyderco has used it in several models.
Böhler K390 Steel at a Glance
| Type | Powder metallurgy (PM) steel |
|---|---|
| Made by | Böhler (Austria) |
| Typical hardness | 62-64 HRC |
| Key elements | Carbon about 2.47%, chromium about 4.2%, molybdenum about 3.8%, vanadium about 9%, tungsten about 1%, cobalt about 2% |
| Edge retention | 9/10 (excellent) |
| Toughness | 7/10 (very good) |
| Rust resistance | 2/10 (low) |
| Ease of sharpening | 2/10 (very hard) |
| Best for | Tough and long-lasting edge |
Ratings are relative 1 to 10 scores for typical factory heat treatments. See how Böhler K390 ranks against 46 other steels in our Knife Steel Chart.
What Is Böhler K390 Steel?
K390 has about 9% vanadium for very hard carbides, but its low chromium keeps the structure tough. That makes it very different from high-vanadium stainless steels.
Böhler K390 Steel Properties
- Edge retention: Excellent.
- Toughness: Very good.
- Rust resistance: Low. Keep it dry and lightly oiled.
- Ease of sharpening: Very hard. Use diamond or CBN stones.
Böhler K390 vs Other Steels
Böhler K390 vs CPM M4
Compared with CPM M4, Böhler K390 holds an edge slightly longer and is slightly tougher. CPM M4 is slightly easier to sharpen. Read our CPM M4 guide.
Böhler K390 vs CPM S110V
Compared with CPM S110V, Böhler K390 is tougher and is slightly easier to sharpen. CPM S110V holds an edge slightly longer and resists rust better. Read our CPM S110V guide.
Böhler K390 vs CPM 3V
Compared with CPM 3V, Böhler K390 holds an edge longer. CPM 3V is tougher, resists rust slightly better and is easier to sharpen. Read our CPM 3V guide.
Is Böhler K390 Steel Good for Knives?
Yes, for users who want long edge life and can keep a blade dry. Use diamond stones.
Pros:
- Excellent edge retention
- Very good toughness
Cons:
- Rusts easily
- Very hard to sharpen
Knives That Use Böhler K390 Steel
Makers sometimes change blade steels between versions, so check the listing to confirm the steel before you buy.
Frequently Asked Questions
Is Böhler K390 steel stainless?
No. Böhler K390 is not stainless and will rust or patina if left wet. Keep it dry and lightly oiled.
How hard is Böhler K390 steel?
Knives in Böhler K390 are usually heat treated to around 62-64 HRC.
Is Böhler K390 easy to sharpen?
Very hard. Diamond or CBN stones work best.