LC200N
LC200N answers a question every other stainless only mumbles at: what if the knife simply could not rust? Zapp’s nitrogen steel — sold as Z-Finit, Cronidur 30 and N360 — replaces part of carbon’s job with nitrogen, keeping chromium dissolved in the matrix where it prevents corrosion instead of locked up in carbides. The result is a blade steel that shrugs off salt water, sweat and fish blood indefinitely, with surprising toughness and a fine keen edge — at the price of modest wear resistance and a mid-pack ceiling around 60 HRC. For boat knives, dive knives and wet-trade fillet work, nothing mainstream touches it.
LC200N FAQ
Is LC200N really rustproof?
As close as blade steel gets. Its chromium stays in solution (nitrogen does not strip it into carbides the way carbon does), so the passive layer is continuous and self-healing — knives in LC200N survive salt-spray service, saltwater fishing and dive duty that would pit any conventional stainless, including M390. Owners report years of marine use without a spot. Treat “virtually rustproof” as the honest claim; only true crevice abuse (trapped salt under scales) finds a way.
What is LC200N’s edge like?
Fine and keen — closer to AEB-L’s character than to a carbide monster’s. Low carbide volume means it takes a screaming edge easily on ordinary stones and strops, and gives it up faster than M390-class steels in abrasive media. For food prep, filleting and utility cutting the trade feels excellent; for cardboard marathons pick a wear steel instead.
How tough is LC200N?
Very, for a stainless — that same low carbide volume that limits wear resistance buys real impact toughness, comfortably above the premium PM stainless class and in AEB-L’s neighborhood. Thin fillet flex, tips, and hard kitchen service all hold up. It is one of the few genuinely tough, genuinely rustproof combinations on the market.
What hardness does LC200N reach?
58–60 HRC — that is the ceiling, and it is enough. Austenitize around 1950°F, plate quench, cold treat (nitrogen steels respond well to it), temper low; the process is friendly by premium-stainless standards but still kiln work. At 59–60 with its fine structure, edge stability at kitchen angles is excellent; details in our heat treat guide.
What knives should be made from LC200N?
Anything that lives wet: fillet and bait knives (see our fillet geometry guide — this is its dream steel), boat and dive knives, paddling and surf-fishing blades, kitchen knives for owners who will not dry anything, EDC for coastal and sweat-heavy carry. The MagnaCut vs LC200N comparison covers the one modern rival in this niche.
LC200N or MagnaCut?
MagnaCut brings more edge retention and hardness with corrosion resistance close behind LC200N’s; LC200N keeps the absolute rust-immunity crown and sharpens easier. Full-time salt water: LC200N. Everything else wet-adjacent: MagnaCut makes a strong case. The comparison page runs the whole argument.
Also known as: Zapp LC200N, Z-Finit (Alpha Knife Supply), Cronidur 30, Bohler N360
Composition
Carbon 0.30%, Nitrogen 0.50%, Chromium 15.0%, Molybdenum 0.95%, Manganese 1.00%, Silicon 0.50%, Nickel 0.50% (approx.)
Properties
| Property | Rating | Notes |
|---|---|---|
| Toughness | ★★★★☆ | A quiet strength - low carbide volume leaves a clean, tough matrix comfortably above the premium PM stainless class, in the AEB-L neighborhood. Thin fillet blades flex, tips survive, and edges dent rather than chip at sensible hardness. |
| Edge Retention | ★★☆☆☆ | The tradeoff for everything else. Few carbides means wear resistance sits well below M390-class steels - fine edges that touch up in seconds but need touching up sooner in abrasive media. In its natural wet-duty roles (flesh, food, line) the difference rarely shows. |
| Corrosion Resistance | ★★★★★ | The category king. Nitrogen keeps ~15% chromium dissolved and working; the passive layer survives salt water, sweat, blood and acids indefinitely. This is the steel for knives that live in the ocean - genuinely a class beyond every conventional stainless on this site. |
| Machinability / Grinding | ★★★★☆ | Friendly. Low carbide volume grinds and drills easily by stainless standards, finishes cleanly, and sharpens on ordinary stones to a screaming edge - no diamonds required. One of the least punishing premium steels in the shop. |
Heat Treatment
Stock removal. Foil-wrap, austenitize around 1950°F with a modest soak, plate quench, cold treat promptly (nitrogen steels reward it with a point or so of hardness), temper twice low (300-350°F) for 58-60 HRC. Forgiving by premium-stainless standards but still controlled-kiln work.
Best Uses
Fillet, bait and boat knives, dive and rescue blades, surf and paddling EDC, kitchen knives for zero-maintenance owners, coastal carry. Anywhere salt, sweat or permanent wet would kill a conventional stainless.
Sources: Knife Steel Nerds - LC200N/Cronidur 30 History and Properties (knifesteelnerds.com); Zapp LC200N datasheet; Spyderco Salt-series service reports and forum consensus.