420. A stainless
420 is a popular martensitic stainless steel for knife making because it offers excellent corrosion resistance and good strength and hardness. 420 takes a magnetic form in both annealed and hardened conditions, but it only has maximum corrosion resistance when it is hardened and tempered.
440C is a highly corrosion-resistant tool steel.
Here are some of the specific qualities that make it the preferred steel of choice for many knife makers: Polish finish- 440C stainless takes a high, mirror finish better than any of the other stainless steels. And, importantly, it holds that mirror finish longer.
It can withstand exposure to moisture and mild chemicals. Overall, 440 stainless steel, particularly 440A, provides better corrosion resistance than 420, making it more suitable for applications in corrosive environments.
In the hardened condition, 420 has good corrosion resistance to the atmosphere, foods, fresh water, mild alkalies and acids, steam, sterilizing solutions, crude oil, gasoline, and other similar corrosive media.
The main quality of this steel is its ability to restore sharpness very easily; in particular, it can be effectively treated with ceramic honing rods. Sharpening 420HC steel does not present significant difficulties.
Due to its high toughness levels, 1095 carbon steel is best suited for making fixed blade knives for hard use applications such as camping. Its ease of sharpening also makes it a great beginner blade for those learning the art of sharpening.
Ductility Issues: Like other martensitic steels, 420 can become brittle after heat treatment, making it unsuitable for applications where flexibility is required.
1095 steel is well-regarded for its high carbon content, which gives it a hardness that contributes to outstanding edge retention. This means that knives made from 1095 steel can maintain a sharp edge for an extended period between sharpenings.
Excellent Edge Retention: 440 stainless steel is prized for its ability to maintain a sharp edge over long periods, making it ideal for premium knives and cutting tools.
440C was used until 1981 when Buck switched to 425 modified steel, lasting another 11 years. 1992 marks the final steel choice for this line, using the Bos heat treated 420HC, which is found on many Buck models.
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.
Vanadium carbides are among the hardest that form in steel, and chromium carbides are in between iron carbide and vanadium carbide. Steels with very high vanadium content like Vanadis 8, CPM-10V, K390, CPM-15V, etc. have extremely high edge retention.
Carbon steel blades are also well-known for having high wear resistance, which enables them to keep their edges sharp for longer than stainless.
Type 420 is a martensitic stainless steel that provides good corrosion resistance similar to 410 plus increased strength and hardness. It is magnetic in both the annealed and hardened conditions. Maximum corrosion resistance is attained only in the fully hardened condition. It is never used in the annealed condition.
USA Mower Blades are made of carbon steel with a hardness of 38-42 Rockwell. These blades are made of local steel that under goes a salt bath heat treatment to eliminate the need for straightening.
When it comes to making swords and survival knives, 5160 steel is better than 1095 carbon steel, as it's tougher and easier to sharpen. It's also flexible, which is a plus for sword makers. However, 1095 has a superior edge retention,which makes sharpening a breeze.
420HC is the preferred steel for knife makers out of all of the 420 steels. 420HC contains higher levels of carbon, which makes the steel harder.
1095 is a great American knife steel....it's easy to sharpen and keeps an edge, but it will rust. Now D2 is a tool steel, with a large chromium content. I think it's the best American stainless all-around steel out there....it is extremely hard, and as a result, extremely hard to sharpen.
Often considered the benchmark or "gold standard" against which other cutlery steels are measured, S30V maintains its reputation as one of the best steels for hunting knives.
CPM S30V is a martensitic stainless steel designed to offer the best combination of toughness, wear resistance and corrosion resistance. Its chemistry has been specially balanced to promote the formation of vanadium carbides which are harder and more effective than chromium carbides in providing wear resistance.
420 steels are very soft and have very low wear resistance. Because of this, 420 steels don't temper well or take/hold an edge very well.
Aogami, or blue paper steel, is basically shirogami steel with chrome and tungsten added to the steel. This is a very popular steel used in forging high end Japanese kitchen knives. Blue Steel No. 1 has the most durable edge due to its hardness.
Leatherman uses a variety of steel types in our knife blades including: 420HC steel, CPM MagnaCut, S30V, and 154CM.
However, Damascus steel knives are much stronger than stainless steel ones and maintain their sharp edge for lengthier periods. However, these blades require tons more maintenance and are susceptible to rust if not correctly cared for.