CPM CruWear
CPM CruWear is a powder-metallurgy air-hardening tool steel from Crucible designed to sit between D2 and A2 in wear resistance while offering meaningfully better toughness than D2. It is not stainless, trading corrosion resistance for a carbide structure optimized around mechanical performance, and it is a favorite among makers who want a tough, easy-sharpening blade for hard use without going as far into toughness-first territory as CPM 3V.
CPM CruWear FAQ
Is CPM CruWear stainless?
No, it is a non-stainless tool steel. It needs the same regular oiling and drying care as other carbon or low-chromium tool steels.
What hardness does CPM CruWear reach?
Most knives run around 62 Rc. See the heat treat details further down this page for the full recipe.
Is CPM CruWear hard to sharpen?
It benefits from diamond or CBN abrasives for the most efficient sharpening, though it is more forgiving of standard stones than harder-edged steels like CPM M4. See the full grinding and sharpening guide.
How does CPM CruWear compare to CPM 3V or CPM M4?
CruWear offers more wear resistance than CPM 3V at some cost in toughness, and is tougher and easier to grind than CPM M4 at some cost in edge retention. See the full breakdowns: CPM 3V vs CPM CruWear and CPM CruWear vs CPM M4.
Also known as: CPM Cru-Wear, CruWear, Cru-Wear
Composition
| Carbon (C) | 1.15% |
| Chromium (Cr) | 7.50% |
| Molybdenum (Mo) | 1.60% |
| Tungsten (W) | 1.00% |
| Vanadium (V) | 2.40% |
Properties
| Property | Rating | Notes |
|---|---|---|
| Toughness | ★★★★☆ | Notably tougher than D2, approaching A2 in impact testing, and significantly tougher than high-carbide stainless steels like S30V at comparable hardness. Not in the same class as CPM 3V, but a large step up from typical stainless tool steels. |
| Edge Retention | ★★★☆☆ | Good, though behind high-vanadium stainless steels like S90V or M390. CruWear takes a keen edge easily and touches up fast, which many users prefer over outright maximum edge retention. |
| Corrosion Resistance | ★★☆☆☆ | Not stainless. Chromium is intentionally kept below the roughly 10.5% stainless threshold so more of it is available to support toughness and carbide structure rather than corrosion resistance. Needs the same basic care as other carbon tool steels. |
| Machinability / Grinding | ★★★☆☆ | Grinds comparably to other CPM tool steels in this class; moderate belt wear from vanadium and tungsten carbides. Ceramic or zirconia belts work well for stock removal. |
Heat Treatment
Crucible’s recommended heat treatment: austenitize at 1950 F, quench (air or interrupted oil to control warping), then triple temper at 1000 F for at least 2 hours per cycle. This targets around 62 HRC. Double tempering is the minimum; triple tempering is recommended for full stress relief and dimensional stability.
Best Uses
A strong middle-ground choice for hard-use folders and fixed blades: tougher than typical stainless steels, easier to resharpen than high-vanadium super steels, and well suited to users who want a blade that survives abuse without needing a full toughness-first steel like 3V.
Sources: Crucible Industries, CPM CruWear Data Sheet. Knife Steel Nerds, CPM CruWear steel testing and analysis.