Utility blades are primarily made from high-carbon steel for maximum sharpness, or stainless steel for rust resistance. Premium blades often use bi-metal construction or tungsten carbide for heavy-duty, long-lasting performance.
High Carbon Steel
High-carbon steel is a type of steel that contains a high percentage of carbon, typically between 0.6% and 1.4%. This high carbon content gives the steel excellent hardness and edge retention, making it a popular choice for utility knife blades.
Yes, 420 steel is good for specific knife applications, primarily excelling in corrosion resistance, toughness, and ease of sharpening rather than razor-sharp edge retention. It is an excellent budget-friendly choice for diving, kitchen, and everyday carry (EDC) knives.
Over time, your carbon steel knife will develop a patina — this is good! It will help protect the blade from corrosion. Because it is harder than stainless steel, carbon steel is more brittle and thus subject to chipping with improper use. Don't use it to cut through food packaging or to open oysters.
Metal blades are razor sharp because otherwise they'd become uselessly dull even faster. Dull blades are dangerous because users must exert more force to cut materials, which increases the risk of a slip and accidental cut.
No, WD-40 is not recommended for sharpening knives. It is too thin to properly float the metal shavings (swarf) away from the stone, and it can clog the abrasives or cause your blade to skate across diamond surfaces.
Stainless steel and chlorine do not belong together. Quite the contrary. We can safely say that chlorine and chlorine products are among the greatest enemies of stainless steel - certainly of the most commonly used quality, SS 304.
Navy SEALs require knives capable of cutting wet rope, withstanding saltwater corrosion, and operating reliably in sand and mud. Since 1982, the Mark 3 Mod 0 has served as the standard issue knife.
❌ Avoid Landfill Disposal: It's important to avoid throwing knives in the regular trash, as they can harm waste handlers and contribute to landfill waste. Look for local recycling options to ensure proper disposal.
In the knife community, the "Holy Trinity" originally refers to three iconic, high-end American tactical folding knives that defined custom and mid-tech pocket knives.
Stainless steel grades 410, 420 and 440 – martensitic stainless steels. This type of stainless steel is magnetic primarily because it contains large quantities of ferrite in its chemical composition, which is a compound of iron and other elements.
440C was used until 1981 when Buck switched to 425 modified steel, lasting another 11 years.
Carbon content is what makes steel harder, and so the more carbon included, the harder the steel is. Japanese knives are made with higher carbon steel than German knives, and that carbon helps create a longer-lasting sharpness along the cutting edge.
Rule #1: It is important to use a knife adapted to what you want to do / food you want to prepare. For example, you shouldn't use a bread knife to slice a roast or use the blade of a paring knife and use it as a screwdriver (don't laugh, we've all done it!) Rule #2: Don't drop your knife on the floor.
The absolute best blade steels for edge retention are high-alloy powder metallurgy (CPM) steels loaded with vanadium or tungsten carbides. These "super steels" hold an edge significantly longer than standard steels but are highly abrasion-resistant and typically require specialized equipment to sharpen.
CIA agents (case officers and operatives) do not have a single standard-issue knife. Knives are highly personal, mission-specific gear. Officers typically purchase their own to suit their deployment environments, leaning toward lightweight, discreet blades that excel at utility, emergency tasks, or last-ditch self-defense.
KA-BAR® USMC, Straight Edge. The most famous fixed blade knife in the World. Our KA-BAR was designed to serve our troops during World War II and is still doing its job, with honors, 70+ years later.
The Marfione Custom Continental Set features custom versions of Microtech OTF automatic knives used in the John Wick movies. Alongside the Ultratech and Combat Troodon is a set of three 24kt gold plated challenge coins and one seriously tactical pencil.
What Not to Use on Stainless Steel
Its non-porous surface resists bacteria and facilitates hygienic cooking environments. With the increasing public discourse surrounding the safety of kitchen materials, Gen Z's preference for stainless steel reflects an evidence-informed commitment to everyday wellness and clean cooking practices.
Here are some metal pairs that should not be used together:
Milwaukee Fastback 48-22-1502
With a better combination of durability, usability and portability than any other knife we tested, this Milwaukee Fastback model's heavy-duty construction, press-and-flip blade and impressive blade storage gave it the edge over the competition.
The best Western-style chef's knife is from Wüsthof—it's a powerful and sharp kitchen knife, but still refined. Hot on its heels is the Japanese-style Tojiro blade, which cruised through my chopping tests.
Running too fast will cook the blade. It needs shavings to take the heat away, otherwise it gets dull fast. At your speed, probably better to use a grinding wheel instead of a saw blade.