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CTS 204P is a stainless powder steel that balances wear resistance with strong corrosion resistance. It is closely related to M390 and 20CV, and the three share the same ratings in this framework. If you are choosing between knives in those steels, the design and execution of the knife are usually more useful deciding factors than the alloy name.
What Is CTS 204P?
CTS 204P is Carpenter's powder metallurgy stainless grade. It has close chemistry to M390 and CPM 20CV, but retains its own designation and producer specification. Similar chemistry and shared ratings do not establish identical heat treatment or performance in every finished knife.
The 20CV profile explains the other closely related grade you may encounter while shopping.
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 | CTS 204P |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore CTS 204P’s Tradeoffs
Choose a steel above to highlight its position and see all three exact ratings below. The full map fits your screen.
Stainless
CTS 204P
- Abrasive edge retention
- 6.5
- Toughness
- 3.5
- Corrosion resistance
- 9
Same position; corrosion ratings may differ:
All 48 rated materials. Numbers group steels at identical coordinates; colors describe stainless classification, not corrosion scores. Neither direction means a universally better knife.
CTS 204P’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Edge Retention for Frequent Slicing
204P scores 6.5 for abrasive edge retention, the same as M390 and 20CV. That is a useful option for a pocket knife that sees repeated slicing, particularly when stainless care matters too. A thin, well-shaped blade can still cut more comfortably than a thicker one, even when both carry the same steel rating.
Toughness and Edge Damage
Its toughness rating is 3.5. Wear resistance is a stronger part of 204P's appeal than resistance to fracture, so match the edge geometry to the task. If you often chip a blade, a tougher steel may offer a more relevant benefit than another increase in abrasive edge life.
Sharpening and Corrosion Resistance
Diamond or cubic boron nitride (CBN) abrasives are useful for working with 204P's hard carbides. Follow the existing bevel for maintenance and start coarser if damage needs removing. A fine finishing stone is better used after the necessary shaping is done.
Its corrosion-resistance rating is 9. That makes stainless convenience part of the appeal, but rinse away salt or food residue and dry the knife before storage. Check the pivot and other parts as well as the blade after wet use.
Choosing Between 204P, M390 and 20CV
There is little reason to pass over a knife you like solely because it uses 204P rather than M390 or 20CV. Compare the handle, blade shape, dimensions, heat-treatment information and maker support. With these closely related steels, those differences can matter more to everyday use than the name stamped on the blade. Our knife steel guide puts those tradeoffs side by side.
Our M390 profile covers one of the closest alternatives to 204P.
Composition
Our steel composition guide explains what the elements do and how to read these values.
CTS 204P: Carpenter nominal CTS 204P type analysis. Carpenter Technology: CTS 204P.
| Element | CTS 204P |
|---|---|
| Carbon (C) | 1.9% |
| Chromium (Cr) | 20% |
| Vanadium (V) | 4% |
| Silicon (Si) | 0.6% |
| Tungsten (W) | 0.65% |
| Manganese (Mn) | 0.35% |
| Molybdenum (Mo) | 1% |
