BDZ1 is a Carpenter stainless steel designed for a fine, uniform carbide structure. It was developed with razor blades and other fine-edged tools in mind.
My old version of this guide made it sound like a premium super steel. That was not accurate, so I have corrected it.
BDZ1 Steel at a Glance
| Type | Stainless steel |
|---|---|
| Made by | Carpenter Technology (USA), also sold as CTS-BDZ1 |
| Typical hardness | 58-60 HRC |
| Key elements | Carbon about 0.6 to 0.75%, chromium 12.5 to 13.5%, molybdenum up to 0.75% |
| Edge retention | 3/10 (modest) |
| Toughness | 6/10 (good) |
| Rust resistance | 7/10 (very good) |
| Ease of sharpening | 9/10 (very easy) |
| Best for | Razors and fine edges |
Ratings are relative 1 to 10 scores for typical factory heat treatments. See how BDZ1 ranks against 46 other steels in our Knife Steel Chart.
What Is BDZ1 Steel?
BDZ1, also called CTS-BDZ1, is a Carpenter alloy with modest carbon and about 13% chromium. That recipe gives small, even carbides, which is great for very thin, sharp edges. Its maximum working hardness is around 60 HRC.
BDZ1 Steel Properties
- Edge retention: Modest.
- Toughness: Good.
- Rust resistance: Very good.
- Ease of sharpening: Very easy.
BDZ1 Equivalents and Alternatives
It belongs to the same group as 12C27, 13C26 and AEB-L. Do not confuse it with CTS BD1, a different Carpenter steel with more carbon and chromium.
BDZ1 vs Other Steels
BDZ1 vs Sandvik 14C28N
Compared with Sandvik 14C28N, BDZ1 is slightly easier to sharpen. Sandvik 14C28N holds an edge slightly longer, is slightly tougher and resists rust slightly better. Read our Sandvik 14C28N guide.
BDZ1 vs CTS BD1
Compared with CTS BD1, BDZ1 is slightly easier to sharpen. CTS BD1 resists rust slightly better. Read our CTS BD1 guide.
BDZ1 vs CPM S35VN
Compared with CPM S35VN, BDZ1 is slightly tougher and is easier to sharpen. CPM S35VN holds an edge longer. Read our CPM S35VN guide.
Is BDZ1 Steel Good for Knives?
Yes, for knives where a fine, easily sharpened edge matters. For long edge life, choose a higher-wear steel instead.
Pros:
- Takes a very fine edge
- Easy to sharpen
- Good rust resistance
Cons:
- Modest edge retention
- Less common than similar steels
Knives That Use BDZ1 Steel
Makers sometimes change blade steels between versions, so check the listing to confirm the steel before you buy.
Frequently Asked Questions
Is BDZ1 steel stainless?
Yes. BDZ1 is a stainless steel, though no knife steel is completely rust proof. Wipe it dry after use.
How hard is BDZ1 steel?
Knives in BDZ1 are usually heat treated to around 58-60 HRC.
Is BDZ1 easy to sharpen?
Very easy. Most standard stones and pull-through sharpeners work.