Blade material type

D2:
High-grade chromium-molybdenum-vanadium alloy tool steel. Due to its 12% chromium content, it is 80% stainless, the more beautifully polished it is, the less prone it is to rust. In addition to its hardness - 60-61 HRC - it is a very tough material, so if you want a more durable knife, feel free to buy a knife made of such steel! It is less prone to breakage, edge-retaining but harder to break.
Hardness: 60-61 HRC

9CR14MoV and 440C:
High-grade stainless steel. It has a higher carbon and chromium content and a significant amount of molybdenum. It has high abrasion resistance. It has excellent edge retention due to its high carbon content, but rusts more easily than other 440 steels. It is easy to spot, even in camp conditions.
Hardness: 58-59 HRC

7Cr17MoV and 440 and 440A:
Mid-range stainless steel. These stainless steel types have better hardenability, making them harder than the 420 series. Thanks to the proper heat treatment, it has a good edge retention and something easier to cover.
Hardness: 56-57 HRC