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CTS BD1N is a stainless knife steel that offers useful corrosion resistance with modest abrasive edge retention. It is a reasonable option for everyday cutting when you are happy to maintain the edge and like the knife around it. The N matters: BD1N is a separate grade from CTS BD1, not simply a longer way of writing the same name.
What Is CTS BD1N?
CTS BD1N is Carpenter's nitrogen-bearing martensitic stainless steel. The selected composition uses ranges for several elements and a maximum for molybdenum, rather than one exact number for every blade. Its nitrogen addition does not make it equivalent to corrosion-focused steels such as LC200N or Vanax.
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 BD1N |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore CTS BD1N’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 BD1N
- Abrasive edge retention
- 3.5
- Toughness
- 3.5
- Corrosion resistance
- 8.5
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 BD1N’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Edge Retention for Everyday Tasks
BD1N scores 3.5 for abrasive edge retention. It can suit mixed light cutting, but a higher wear-resistance steel may be more useful if you repeatedly work through abrasive materials. The difference is about material wear; the knife's grind and sharpness still influence how pleasant each cut feels.
Our Nitro-V profile covers a stainless alternative with a higher toughness rating.
Toughness and Knife Design
Its toughness rating is also 3.5. Corrosion resistance is the stronger part of its profile, so BD1N is not the obvious choice when preventing chips is your main priority. A suitable edge angle and controlled cutting help, while tougher alternatives such as AEB-L offer a different balance.
Corrosion Resistance and Sharpening
BD1N has a corrosion-resistance rating of 8.5. That is useful for everyday exposure to moisture, but clean and dry the knife after use rather than treating the number as a rust-proof guarantee. Pay attention to the pivot and hardware as well as the blade.
Suitable conventional sharpening stones can work with BD1N, and diamond abrasives are another option. Keep the angle consistent and use light finishing passes to remove the burr. For a damaged edge, start with a grit coarse enough to repair it rather than relying on a fine finishing stone.
When Would You Choose CTS BD1N?
BD1N makes sense when the knife has the blade shape, handle and price you want, and corrosion resistance matters more than high wear resistance. Check the exact grade on older reviews and listings so you are not comparing BD1 observations with a BD1N knife. For occasional cutting, a comfortable, well-shaped knife may be more useful than paying extra for a wear rating you rarely need. Our knife steel guide explains the wider tradeoffs.
Composition
Our steel composition guide explains what the elements do and how to read these values.
CTS BD1N: Carpenter Type Analysis ranges and maxima, mass %. Iron is the balance; values describe this source rather than every producer’s material. Carpenter Technology: CTS BD1N alloy data sheet.
| Element | CTS BD1N |
|---|---|
| Carbon (C) | 0.85–0.95% |
| Chromium (Cr) | 15–17% |
| Molybdenum (Mo) | ≤0.5% |
| Nitrogen (N) | 0.1–0.15% |
| Manganese (Mn) | ≤1% |
| Silicon (Si) | ≤1% |
| Phosphorus (P) | ≤0.03% |
| Sulfur (S) | ≤0.01% |
