Knife Steel Equivalents Explained: Why One Steel Has Five Different Names (2026)
Two folding knives, same blade steel, two completely different names printed on the box. One says D2, the other says K110. One says 154CM, the other says ATS-34. Nothing about the steel changed — only who is allowed to use which name for it.
This is the single most confusing thing about shopping for an EDC knife, and it costs buyers real money. People pay a premium for a "premium" steel that is chemically the same material as a $40 knife's blade, or skip a good knife because the steel name looks unfamiliar. Here is the map.
Why one steel ends up with five names
Three separate naming systems collide in every knife listing.
Producer designations. Steel mills name their products. When Crucible developed a martensitic stainless, it sold it as 154CM — the "CM" stands for Crucible Martensitic. When Hitachi produced essentially the same alloy for the Japanese market, it sold it as ATS-34. Two names, one recipe.
National and industry standards. AISI/SAE numbers (440C), German Werkstoff numbers (1.2379) and their EN short forms (X153CrMoV12), Japanese Industrial Standards (SKD11) and Chinese GB designations (9Cr18MoV) all describe steel chemistries with their own numbering logic. The SAE steel grade system alone spans thousands of alloys, so cross-referencing by hand is hopeless unless you know the common pairs.
Marketing names. Knife brands invent names for steels they have made to their own spec, and those names often describe a steel you already know under a different label. Sometimes the name is genuinely new chemistry; sometimes it is the same alloy with a new badge.
The alias map: seven families worth memorizing
1. 154CM and ATS-34
These two are the classic example. 154CM is Crucible's designation; ATS-34 is Hitachi's near-identical counterpart. Both are high-carbon martensitic stainless steels with roughly the same chromium and molybdenum content, and they have been used interchangeably by custom makers for decades.
In the catalog this matters right now: the Kizer Varatas Nitro-V at $34.50 and the Kizer Varatas 154CM at $39.50 are the same knife with two different blade steels and four dollars between them. Knowing what 154CM actually is makes that price step legible rather than mysterious. We ran the full head-to-head in 154CM vs S35VN: mid-range against premium.
2. AEB-L, 13C26, Nitro-V and 14C28N — the nitrogen family
This is the family that confuses the most people, because the names all sound unrelated.
- AEB-L is the Uddeholm designation.
- 13C26 is Sandvik's designation for a steel of essentially the same composition.
- Nitro-V starts from the AEB-L recipe and adds nitrogen and vanadium.
- 14C28N is Sandvik's nitrogen-enhanced development of the same lineage.
AEB-L and its relatives are famous in the knife world for being tough at high hardness with fine edge stability, which is why they show up on smaller blades and budget folders. The Vosteed Marmoset fixed blade at $49.95 runs AEB-L at 2.20 inches — a geometry where fine-grained toughness is the whole point. Nitrogen in the mix mainly buys corrosion resistance, which is why Nitro-V and 14C28N feel so low-maintenance in a pocket next to a sweaty leg.
3. D2, K110, 1.2379 and SLD
D2 is a tool steel: high carbon, high chromium, not technically stainless even though it resists rust reasonably well. Because it is a tool steel rather than a knife-specific alloy, it exists under a pile of industrial names.
- D2 — the AISI/SAE tool steel designation.
- K110 — Bohler's designation for the same class of steel.
- 1.2379 / X153CrMoV12 — the German Werkstoff number and its EN short form.
- SKD11 — the Japanese Industrial Standards designation, with Hitachi's SLD as a well-known commercial variant.
- CPM-D2 — a powder-metallurgy version of the same chemistry, made by Crucible.
You can watch this play out inside one brand. CIVIVI sells a knife with a K110 blade — the Sentinel Strike at $105 — where most of its catalog uses the name D2. Same tool steel family, two names, one brand. D2's chemistry and background are well documented if you want the technical picture.
4. 440C and 9Cr18MoV
440C is the classic American high-chromium stainless. 9Cr18MoV is the Chinese GB designation for the closest domestic equivalent: roughly 0.9% carbon, 18% chromium, plus molybdenum and vanadium. In practice they land in the same performance neighbourhood — good corrosion resistance, respectable edge retention, not the toughest choice available.
If you are comparing a $30 folder labelled 9Cr18MoV against a $200 folder labelled 440C and assuming the naming gap means a quality gap, you are comparing a standard system against a brand's marketing shorthand. Both are mid-tier stainless at heart — the real differences show up when you put two of them side by side, which is what we did in 9Cr18MoV vs 8Cr13MoV: budget Chinese steels compared.
5. M390, CPM-20CV and CTS-204P
Three mills, one recipe, three names — and this one has a real price consequence, because M390 carries a premium reputation while 20CV and CTS-204P are treated as workhorses.
- M390 — Bohler.
- CPM-20CV — Crucible.
- CTS-204P — Carpenter.
All three are high-vanadium powder-metallurgy stainless steels with near-identical chemistry: excellent edge retention, strong corrosion resistance, and a reputation for being harder to sharpen than they are to love. A knife wearing any of the three names is in the same performance bracket, which is why the Kizer Cormorant in 20CV at $101.50 is worth a serious look from buyers who have been told premium steel starts at M390 prices.
6. S35VN is S30V with niobium
This is not a cross-brand alias but a documented evolution: CPM S35VN is a niobium-modified development of S30V. Adding niobium to the recipe improves toughness and makes the steel noticeably easier to machine and finish while keeping the wear resistance that made S30V popular.
So when you see a listing in S35VN, you are looking at the second generation of a well-understood powder steel — not an obscure alloy. That lineage is why S35VN shows up across mid-range and premium folders at prices that look low for the performance.
7. Z-Wear PM and CPM CruWear
Zapp's Z-Wear PM is the powder-metallurgy counterpart to Crucible's CPM CruWear. Both belong to the tough, moderately wear-resistant tool steel family that knife people reach for when they want an edge that survives impact rather than one that just resists abrasion.
Two Kizer listings show the naming split inside one catalog: the Kizer Feweed in Z-Wear PM at $179 and the Kizer Ara in CPM CruWear at $299. Different names, same family, and the price difference comes from the rest of the build — timascus and titanium on the Ara versus a simpler frame on the Feweed — not from the steel being a different material.
What is *not* an alias
Not every unfamiliar name is a hidden version of a steel you know. Three traps:
Damascus is not a steel. It is a pattern produced by forge-welding layers of different steels together, then etching to reveal the layering. The performance depends entirely on which steels were stacked and how they were heat treated. Two knives labelled Damascus can behave completely differently.
Proprietary powder steels are their own thing. Artisan Cutlery's AR-RPM9 and CJRB's similar lines are brand-specific powder-metallurgy steels developed for the affordable end of the market. Calling them "a D2 equivalent" would be a stretch — they are their own chemistry, chosen for consistent quality at volume.
Nitrogen steels have no exact twins. Carpenter's LC200N runs on a nitrogen-based chemistry rather than chromium carbides, which is why it resists rust so aggressively. The Kizer Drop Bear in LC200N at $159 is a good example of what that buys: a titanium-handled folder for people whose carry sees salt water or constant humidity. Uddeholm's Vanax occupies similar territory. Neither has a D2-style alias because the chemistry was engineered for a specific purpose rather than adapted from an industrial standard — we compared the whole group in MagnaCut vs Vanax vs LC200N.
There is one more wrinkle worth knowing about: some steels now have more than one producer making the exact same alloy under the original name. Where a steel was once made by a single mill, competitors now produce it to the same specification, and buyers are asking whether the origin matters as much as the name. That question is being tested directly in the knife community — Knife Steel Nerds ran a comparison between two producers of the same steel and the result is worth reading before you pay a premium strictly for a name.
How to read a listing like someone who knows the map
Run this checklist on any listing that quotes a steel you do not recognize:
- Search the name plus "equivalent." Nine times out of ten you will land on a mill datasheet or a forum thread mapping it to a familiar standard.
- Check whether the name belongs to a mill or to a knife brand. Mill names (Bohler, Crucible, Sandvik, Uddeholm, Carpenter, Zapp) describe steel you can cross-reference. Brand names describe what that company has chosen to put in its knife.
- Look at the hardness spec, not just the steel name. A 154CM blade at HRC 60±1 and a 154CM blade at HRC 56 are different knives. Hardness is the single number most listings omit.
- Judge the knife, not the label. Geometry, grind, handle and price matter more than whether the blade says K110 or D2.
Two more catalog examples make the point. The CIVIVI Aquila at $80 runs VG-10, the Japanese standard stainless that is often compared with Bohler's N690 — a cobalt-bearing family where both are treated as dependable mid-premium choices rather than exotic alloys. And the CJRB Ria in 12C27 at $32.98 wears a Sandvik designation most budget buyers have never heard of, in a knife that costs less than dinner.
The name doesn't change the steel — heat treatment does
Here is the part the naming debate quietly skips. Two blades with identical chemistry and identical hardness numbers can still cut for very different lengths of time, because heat treatment controls how the carbides are distributed and how the steel is tempered. Steel composition sets the ceiling; heat treatment decides how close the finished knife gets to it.
That is the practical reason to stop shopping by name alone. A well-treated 154CM blade from a maker with a consistent process will outperform a badly treated exotic steel, and there are budget knives in this catalog that prove it.
Bottom line
The steel name on the box tells you which mill, which standard or which marketing department named the alloy — not how good the knife is. Learn the seven alias families above and you can decode almost any listing you will ever see:
- 154CM = ATS-34
- AEB-L = 13C26, with Nitro-V and 14C28N as nitrogen-enhanced relatives
- D2 = K110 = 1.2379 = SKD11, with CPM-D2 as the powder version
- 440C ≈ 9Cr18MoV
- M390 ≈ CPM-20CV ≈ CTS-204P
- S35VN = S30V with niobium
- Z-Wear PM ≈ CPM CruWear
Everything else — Damascus patterns, brand-specific powder steels, nitrogen alloys — is a separate story, and worth understanding on its own terms rather than by analogy. If you want the deeper chemistry behind all of this, our walkthrough of the alloying elements that make a knife steel perform is the next step, and our ranking of which steels hold an edge longest puts the whole map in performance order.