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D2 can make sense for a knife that does plenty of slicing, provided you are willing to give the blade some rust care. It offers useful abrasive wear resistance, but gives up toughness and corrosion resistance compared with steels such as 14C28N. A good D2 knife is still a knife to choose on its grind, heat treatment and handle, not the steel name alone.
What Is D2 Steel?
D2 is a high-carbon, high-chromium tool steel used in knives as well as industrial cutting tools. This profile covers conventional D2. CPM-D2 is a powder metallurgy version with a different carbide structure, so its properties should not be substituted for the D2 ratings here. Thomas's D2 research explains that distinction.
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 | D2 |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore D2’s Tradeoffs
Choose a steel above to highlight its position and see all three exact ratings below. The full map fits your screen.
Non-stainless tool steel
D2
- Abrasive edge retention
- 5
- Toughness
- 3.5
- Corrosion resistance
- 4.5
All 48 rated materials. Numbers group steels at identical coordinates; colors describe stainless classification, not corrosion scores. Neither direction means a universally better knife.
D2’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Where D2 Makes Sense
D2's abrasive edge-retention rating is 5. That makes it worth a look for repeated slicing when the cutting edge wears dull rather than being damaged. Cardboard is one example, but keep the blade clear of staples and other hard objects. The score does not predict how many boxes a particular knife will handle, and it is not a substitute for a comfortable grip or an effective grind.
Is D2 Stainless?
No. D2 contains substantial chromium, but some of it is tied up in carbides rather than available to resist corrosion. Calling it “semi-stainless” can make its care needs sound smaller than they are. Thomas's explanation of D2 corrosion covers why total chromium is not the whole story. Wipe away moisture and residue after use, and follow the knife maker's advice on protection during storage.
D2 or a Stainless Alternative?
For regular use around moisture, stainless 14C28N is easier to recommend if you can accept lower abrasive edge retention. If you already have a D2 knife whose care and cutting performance suit you, there is no need to replace it just because another grade has higher scores. To explore a different balance, see our knife steel guide.
The 14C28N steel profile takes a closer look at that stainless option.
Compare 14C28N vs D2 in the comparison tool to see their ratings side by side.
Composition
The D2 values below are Niagara's listed composition for its material, not a universal formula for every maker's D2. Our steel composition guide explains the elements and how to read source-specific values.
D2: Niagara typical composition, mass %; selected elements, not a batch analysis. Niagara Specialty Metals: D2.
| Element | D2 |
|---|---|
| Carbon (C) | 1.42% |
| Chromium (Cr) | 11.5% |
| Molybdenum (Mo) | 0.9% |
| Vanadium (V) | 0.8% |
