Knife Steel: The Comprehensive Guide to Steel Types, Properties, and Applications

The steel of a knife blade significantly influences how long it stays sharp, how easily it can be resharpened, and its resistance to rust and mechanical stress. Therefore, there's no single best knife steel: the decisive factor is which properties are needed for the specific use case.

From classic carbon steels like 1095 to rust-resistant steels like 14C28N and VG-10 to modern powder metallurgical steels like M390, CPM S35VN, or MagnaCut, there is a wide range of different materials. Each of them has different strengths.

What properties are important for knife steel?

When selecting a knife steel, edge retention, rust resistance, sharpenability, and toughness play a particularly important role. These properties are sometimes in conflict with each other. For example, a steel with particularly high wear resistance may stay sharp longer but is often more difficult to resharpen.

Edge Retention

Edge retention describes how long a blade maintains its cutting ability under a certain load. The wear resistance of the steel plays an important role here. Hard carbides like vanadium carbides can significantly increase wear resistance.

Steels like M390, CPM S90V, or CPM 20CV therefore achieve very high edge retention. Classic carbon steels like 1095, on the other hand, focus on other properties and are comparatively easy to resharpen.

Rust Resistance

Rust resistance is particularly important for kitchen knives, EDC knives, hunting knives, and knives for damp or maritime environments.

The term "stainless" is somewhat misleading. Even rust-resistant steels can corrode under unfavorable conditions. The decisive factor is not just the total chromium content, but also how much chromium is actually available in the microstructure for passivation and which carbides form during heat treatment, among other things.

Therefore, two steels with similar chromium content cannot automatically be considered equally corrosion resistant. The microstructure and heat treatment have a significant influence on the behavior of the finished knife.

Sharpenability

How easily a knife can be resharpened depends, among other things, on hardness, carbide structure, and wear resistance. Simpler carbon steels can often be sharpened with comparatively little effort. Steels with high proportions of very hard carbides, on the other hand, may require more demanding abrasives.

Therefore, high edge retention and easy sharpenability are not automatically achievable to the maximum simultaneously.

Toughness

Toughness, simply put, describes how well a steel can absorb mechanical loads without breaking or chipping. It is particularly relevant for outdoor, bushcraft, and work knives.

For a knife that primarily cuts, other priorities apply than for a blade that is subjected to high impact or stress forces. Therefore, a steel with maximum edge retention is not automatically the best choice for every outdoor or work knife.

What do "stainless" and "stain-resistant" mean?

For knives, the terms stainless, rust-resistant, and stain-resistant are often used synonymously. Technically, "stain-resistant" is the more cautious term: a rust-resistant steel has high resistance to corrosion but is not corrosion-free under all conditions.

Chromium plays a central role in this. In steels with sufficient chromium, a thin passive oxide layer can form, protecting the underlying material from further corrosion. However, how well this protective effect works depends on the overall chemical composition and microstructure.

For everyday use, this means: A rust-resistant steel normally requires less care than an unprotected carbon steel. However, with saltwater, acids, moisture, or prolonged neglect, even a rust-resistant knife steel can develop signs of corrosion.

More on this: Stainless or stain-resistant – what does that mean for knife steel?

What is carbon steel?

Carbon steels contain carbon as an important element and comparatively small amounts of other alloying elements. Classic knife steels like 1066, 1075 or 1095 belong to this group.

Their great advantage is not that they are better in every property than modern rust-resistant steels. Rather, carbon steels can offer an interesting combination of hardness, toughness, cutting performance, and easy sharpenability.

The most important disadvantage is their lower corrosion resistance. A carbon steel blade therefore requires more attention in moist conditions and should be cleaned and dried after use.

For many outdoor, bushcraft, and traditional knives, this is not a disadvantage. Those willing to care for the blade can benefit from the properties of a good carbon steel.

More on this: Carbon steel in knives – Advantages, disadvantages, and care

Powder steel or conventional steel?

Different processes are used in the production of knife steel. In conventionally smelted steels, the alloy is first melted and then further processed. In powder metallurgical steels, the liquid metal is instead atomized into fine powder and further processed under controlled conditions.

Powder metallurgy enables very uniform and fine microstructure structures and can offer advantages, particularly with highly alloyed steels. Well-known powder metallurgical knife steels include M390, CPM S35VN, CPM S90V, CPM 3V, CPM M4, and MagnaCut.

"Powder steel" is not a separate quality class. A powder metallurgical steel can have different properties. CPM 3V, for example, places a strong emphasis on toughness, while CPM S90V is designed for very high wear resistance and edge retention.

More on this: Powder steel vs. conventional knife steel

Which knife steel for which application?

Kitchen knives

For kitchen knives, rust resistance, sharpenability, and a fine edge are particularly important. Rust-resistant steels such as 1.4116, 12C27 or VG-10 are therefore often used for kitchen knives.

For high-quality kitchen knives, highly alloyed steels can also be interesting if particularly long edge retention is desired. However, the specific design and heat treatment of the blade always remain decisive.

EDC and Pocket Knives

For EDC knives, a balanced combination of edge retention and corrosion resistance is particularly practical. Steels like M390, CPM S35VN, or MagnaCut are examples of modern rust-resistant knife steels with high performance.

Outdoor and Bushcraft

For outdoor and bushcraft knives, toughness plays a particularly important role. A steel must not only cut for a long time but also be able to withstand mechanical stresses.

CPM 3V, for example, is designed for high toughness. Those who often work in damp conditions, however, may prefer a rust-resistant steel. MagnaCut, for example, combines high corrosion resistance with toughness that is high for a rust-resistant PM steel.

Hunting

For hunting knives, cutting performance, cleaning, and corrosion resistance meet. Rust-resistant steels can be particularly practical here if the blade regularly comes into contact with moisture and organic residues.

Maritime Environment and Saltwater

For knives that regularly come into contact with saltwater, high corrosion resistance is particularly important. Steels like LC200N were developed specifically for applications with high demands on corrosion resistance.

Is there a best knife steel?

No. There is no knife steel that is simultaneously superior in all relevant properties. A steel with maximum edge retention may require compromises in toughness or sharpenability. A particularly tough steel does not necessarily have the highest wear resistance. And an extremely corrosion-resistant steel is not automatically the best choice for a knife that is mainly exposed to high mechanical stress.

Therefore, the right question is not "Which knife steel is the best?", but:

What properties do I need for my knife and my application?

Price-Performance Ratio for Knife Steel

An expensive steel does not automatically make a knife better. The steel is only one part of the overall system of geometry, heat treatment, blade grind, and workmanship.

For many applications, established steels like 12C27, 14C28N, or 1.4116 offer a very good balance of cutting performance, corrosion resistance, and sharpenability. High-priced powder metallurgical steels can offer additional performance, for example, in wear resistance, toughness, or corrosion resistance. Whether this added value is worthwhile depends on the knife's use.

For a knife that only occasionally cuts cardboard, maximum edge retention may be less relevant than for a knife that is used intensively every day.

Well-known Knife Steel Manufacturers

Many well-known knife steels come from specialized steel manufacturers. These include Böhler, Uddeholm, Crucible Industries, Carpenter Technology, and Erasteel.

Well-known designations such as M390, Elmax, CPM S35VN, or CPM MagnaCut are specific steel grades and not general categories. The designation "CPM," for example, stands for Crucible's powder metallurgical manufacturing process.

When evaluating a knife, it should also be considered that the same steel can achieve different properties depending on the heat treatment and hardness. The designation on the blade alone therefore does not describe the complete performance of the finished knife.

Compare Knife Steel

On our knife steel overview, you will find the most important knife steels sorted alphabetically and by steel groups. For each steel type, you will find information on edge retention, rust resistance, sharpenability, areas of use, and chemical composition.

This allows you to compare classic carbon steels like 1095 directly with rust-resistant steels like 14C28N or modern powder metallurgical steels like M390 and MagnaCut.

Frequently Asked Questions about Knife Steel

Is an expensive knife steel automatically better?

No. An expensive or modern steel can significantly improve certain properties, but it may not be the better choice for every application. A simpler steel may be perfectly sufficient for the desired application.

Is M390 better than 1095?

Not universally. M390 offers high wear resistance and corrosion resistance, while 1095 is a classic carbon steel with different properties. For a low-maintenance EDC knife, M390 can have advantages; for certain outdoor or traditional knives, a carbon steel may be more sensible.

Is D2 stainless?

D2 has a high chromium content and comparatively high corrosion resistance, but it is not usually considered fully stainless steel. Under unfavorable conditions, D2 can corrode.

Are powder steels always better?

No. Powder metallurgy enables very high-performance steels, but different PM steels are optimized for different properties. CPM 3V and CPM S90V, for example, pursue very different property priorities.

Which steel stays sharp longest?

Steels with high wear resistance and a high proportion of hard carbides can achieve very high edge retention. Well-known examples include CPM S90V, M390, and CPM 20CV. However, the actual edge retention of a knife also depends on hardness, heat treatment, edge geometry, and the specific stress.

Which steel does not rust?

No knife steel should be considered completely rust-free under all conditions. However, some steels have exceptionally high corrosion resistance. These include, for example, LC200N and MagnaCut.

Is carbon steel worse than stainless steel?

No. Carbon steels deliberately forgo some corrosion resistance and can offer other properties in return. They are particularly interesting when easy sharpenability, cutting performance, or certain mechanical properties are more important than maximum rust resistance.

Which knife steel suits you?

The best choice depends on your use: for the kitchen and daily use, rust-resistant and easily sharpenable steels are practical. For EDC knives, high edge retention with good corrosion resistance can be interesting. For outdoor and bushcraft knives, toughness plays a greater role, while for saltwater and maritime use, corrosion resistance becomes particularly important. In this guide, we explore a bit more precisely which steel is generally suitable for which application.

If you already know which steel type your knife uses, you will find a detailed classification of the respective steel in our knife steel overview.