CTS-204P is Carpenter’s version of the M390 recipe. It is used in premium folders from several major brands.
CTS-204P Steel at a Glance
| Type | Powder metallurgy (PM) steel |
|---|---|
| Made by | Carpenter Technology (USA) |
| Typical hardness | 59-62 HRC |
| Key elements | Carbon about 1.9%, chromium about 20%, molybdenum about 1%, vanadium about 4%, tungsten about 0.6% |
| Edge retention | 9/10 (excellent) |
| Toughness | 3/10 (modest) |
| Rust resistance | 9/10 (excellent) |
| Ease of sharpening | 3/10 (hard) |
| Best for | High-end EDC, low maintenance |
Ratings are relative 1 to 10 scores for typical factory heat treatments. See how CTS-204P ranks against 46 other steels in our Knife Steel Chart.
What Is CTS-204P Steel?
204P is a powder steel made by Carpenter. Its chemistry matches M390 and CPM 20CV, so performance is nearly identical. Differences come down to the knife maker’s heat treatment.
CTS-204P Steel Properties
- Edge retention: Excellent.
- Toughness: Modest.
- Rust resistance: Excellent.
- Ease of sharpening: Hard. Use diamond or CBN stones.
CTS-204P Equivalents and Alternatives
M390 and CPM 20CV are equivalents.
CTS-204P vs Other Steels
CTS-204P vs CPM 20CV
CTS-204P and CPM 20CV perform very similarly. Choose based on price, the knife design and the maker’s heat treatment. Read our CPM 20CV guide.
CTS-204P vs CPM S35VN
Compared with CPM S35VN, CTS-204P holds an edge longer and resists rust better. CPM S35VN is tougher and is easier to sharpen. Read our CPM S35VN guide.
CTS-204P vs CTS XHP
Compared with CTS XHP, CTS-204P holds an edge longer and resists rust better. CTS XHP is slightly tougher and is slightly easier to sharpen. Read our CTS XHP guide.
Is CTS-204P Steel Good for Knives?
Yes, for a premium, low-maintenance EDC knife.
Pros:
- Excellent edge retention
- Excellent rust resistance
Cons:
- Hard to sharpen
- Lower toughness
Knives That Use CTS-204P Steel
Makers sometimes change blade steels between versions, so check the listing to confirm the steel before you buy.
Frequently Asked Questions
Is CTS-204P steel stainless?
Yes. CTS-204P is a stainless steel, though no knife steel is completely rust proof. Wipe it dry after use.
How hard is CTS-204P steel?
Knives in CTS-204P are usually heat treated to around 59-62 HRC.
Is CTS-204P easy to sharpen?
Hard. Diamond or CBN stones work best.