What Are The Differences Between Carbon, Stainless, Damascus, and Other Steels?

With modern metallurgy continually advancing, and with the plethora of different steel options available today, it is easy for a prospective knife-buyer to get bogged down in the details of which steel to pick: should I buy a carbon steel blade or a stainless steel blade? What about a Damascus blade? What do the numbers and letters mean, like 1084 or 52100, or AEBL, or VG10? While there is much to say on this topic, and some folks will opt to dive more deeply into the metallurgical weeds, I am going to attempt to give a good foundation of the different categories of steel available for your knives.

Carbon: Carbon steel is the original knife steel, dating back to the early iron age, when smiths found out that iron treated in a certain way (to increase its carbon content) was harder and lasted longer than plain iron, and they started using that material to make blades. Up until the mid twentieth century, carbon steel was basically the only kind of steel used to make knives. It tends to be both hard and tough, can hold a fine edge for a long time, and it is typically easy to sharpen.
A carbon steel knife is like a cast iron skillet: it is a classic tool that has stood the test of time, and it takes a little bit of special care to keep it in good condition. Carbon steel will develop a patina, or a dark surface finish, over time, as it reacts slightly with acids in the food. In order to keep it from rusting, it is important to dry it after use and store it in a dry location. With a little practice, the ritual of caring for a carbon steel knife becomes second nature.

Carbon steels really shine when it comes to toughness. There are no other materials that are as well-suited for making impact tools such as cleavers, camp chopping knives, axes, or swords, and even when they are heat treated for high toughness, many carbon steels can still retain a substantial degree of hardness, leading to improved edge performance.

Stainless: Stainless steel is a relatively new development, compared to the time-honored carbon steel, as it only came about around the middle of the twentieth century, and stainless steel that is hard enough to use for knife blades was developed even later. Stainless steels have the obvious advantage of being far more corrosion resistant than carbon steels, which makes them easier to care for. They can be used constantly in wet environments and left to air dry, and they will still stay shiny.

The advantage of corrosion resistance comes with certain tradeoffs, however, first and foremost in the form of reduced toughness. The reduced toughness can manifest as micro-chipping on an edge that is ground too thin, or at its worst, it can manifest as a blade breaking when it is bent too far. Some kinds of stainless steel, such as Nitro-V, AEBL, and Magnacut, among others, are designed to be tougher than others, and lend themselves for knives with thin edge geometry, such as kitchen knives and fillet knives.

In recent decades there has been an explosion in the prevalence of so-called “high performance” stainless steel alloys, which have taken the knife world by storm. These alloys are typically quite wear-resistant, meaning they will hold a sharp edge for an extraordinarily long time compared to carbon steel, however their wear resistance also makes them much more challenging to re-sharpen once they get dull. If you or someone you know is good at sharpening (and has a good set of diamond stones,) or if you can send your knife back to the maker for sharpening occasionally, the extra edge life of a high-performance stainless steel would certainly be worth considering.

Damascus: The term “Damascus steel” can refer to two different types of steel (see last month’s blog) but the most common in today’s market is pattern-welded steel. The lion’s share of this type of steel is made with alternating layers of carbon steels, so Damascus blades will share the same working characteristics as carbon steels. In centuries past, these blades were considered to be superior to homogeneous steel blades, but the clean, well-made steel of the industrial age rendered that advantage obsolete. Today, the reason to buy a Damascus blade is for its dashing good looks.

There are several makers and manufacturers who are now starting to produce stainless Damascus, which, logically, will share the same working properties as the stainless steels welded together to produce the material. In my research, I have noticed that several of the companies producing this are using a combination of hardenable and non-hardenable steel, which may affect the edge performance of the finished knife, as the softer steel portions will likely dull faster than the harder steel portions. If you are looking for a stainless Damascus knife, I recommend looking for a high-performance version, made from two different hardenable steels, and prepare to pay double what you would expect to pay for a carbon steel Damascus blade of the same style.

Carbide: There are a few folks who advocate for the use of carbide knife blades for certain applications. “Carbide” typically refers to tungsten carbide, and it is an incredibly hard material often used for saw teeth and metal machining cutters. Tungsten carbide is too brittle to use for a knife on its own, but it can be electrically deposited on titanium or another tough material to use as a cutting edge. I am not an expert in this type of material combination, but my gut instinct is that such a knife would be great for warehouse work: opening boxes and cutting pallet strapping, and other high-wear operations. I do not think a carbidized titanium knife would be satisfactory in the kitchen.

Ceramic: Some larger manufacturers are producing ceramic knife blades, which can in fact be made sharper than steel. Ceramic blades avoid the risk of corrosion entirely, which is perhaps their primary advantage. Unfortunately, ceramic is simply not tough enough to withstand regular use as a knife blade, and ceramic blades are incredibly prone to breaks and large chips, which typically means they need to be replaced.
A recommendation is also to learn about key factors that make the best kitchen knife.
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I primarily work with Damascus. If you would like to commission a culinary knife to your specifications, you can start the process by filling out my contact form and sending me a description of what you are looking for.
If you are looking for a limited edition culinary knife that has been hand forged and is ready to order, feel free to check out my shop.