Blade BRISA Elver 85 D2

Blade Elver 85/F from Brisa Knives Finland - one of the most famous knife companies from Finland, is made for surface mounting, blade height 23 mm, length - 85 mm, butt thickness 3.5 mm. The total length of the workpiece is 190 mm. Descents are made from the butt. Let us immediately note this very important point. Scandinavian descents, or descents from the butt itself to the supply, significantly improve the cutting properties of the knife, but such a construct is quite laborious to implement, therefore it is inherent only in very good and expensive blades. The workpiece is sharpened, at first glance the knife is very sharp. But this is just a technological sharpening, which indicates the angle that the manufacturer recommends for sharpening this product in the future. Therefore, looking ahead, let's say that after manufacturing the knife should still be sharpened for real. The blade of the BRISA Elver 85/F is not a classic Finnish puukko, it is distinguished by Scandinavian slopes from the butt and a slightly littered projection of the butt. A slight understatement of the butt line to the tip - something between the blade system, called Normal Blade and Drop-Point, looks very impressive and gives the knife profile both elegance and aggressiveness.
The shank for surface mounting has 5 mounting holes and one large technological cutout, which serves to reduce the weight of the handle and improve the balance of the finished knife. Mounting holes are made for inch sizes of ties (or pins). Closer to the end of the handle there is a hole for a lanyard pin or a tube (Lanyard Hole) with a diameter of 6.3 mm. On the opposite side of the handle, closer to the blade, there are three holes: one, in the center, for a 4.6 mm Corby (Corby Hole) coupler (the same hole was made symmetrically on the other side of the technological cutout) and two on the sides of it - pin ( Pin Hole) under 4mm. Traditionally, the installation of overlays for this knife is done using only two holes - a lanyard hole and a hole for a tie, and for beauty and reliability, you can install a pin anywhere in the technological cutout.
The blade is laser engraved with the logo of one of the brands under which Brisa knives are produced - EnZo and the brand of steel from which it is made - this is the famous D2. The original D2 steel was developed in the USA in the 60s of the last century and is currently produced around the world under various abbreviations. These are X155CrMo12 for Germany (according to the common European steel designation system D2 is marked as 1.2379), SLD for Japan, SKD-11 for Sweden and of course the famous X12MF for the post-Soviet space.
Chemical composition of steel D2:
Carbon (C),% 1.55
Manganese (Mn), %0.35
Chromium (Cr), %12
Silicon (Si),% 0.45
Molybdenum (Mo),% 0.90
Vanadium (V),% 0.90

Despite the fact that D2 steel does not have a wide variety of ligatures and was not developed specifically for the knife theme, its use for making knives immediately came into use. Many people think that D2 knife steel is the best option. Knives made of this steel perfectly hold sharpening, resistant to deformation and high temperatures, and have good anti-corrosion properties. That is why the analogue of D2, Kh12MF steel, was recommended in the USSR for the production of the most critical cutting tool in terms of characteristics. Although technically D2 steel is not stainless. Stainless steel starts with 13% chromium in the composition of the master alloy, D2 has 12%. Therefore, prolonged exposure to adverse conditions may cause corrosion on the knife. Hardness D2 is usually in the hardness range with values ​​from 57 to 61 HRC. However, like most Finnish knives, D2 steel blades are hardened to a hardness of 58-59 HRC. The fact is that when operating at low temperatures, in the cold (when the temperature drops, the hardness of steel increases), a blade with high hardness becomes brittle, like glass. Therefore, a value of 58-59 HRC is the optimal value for a knife used outdoors.