Blade Brisa Necker 70/F 12C27

Blade Necker 70/F from Brisa Knives Finland - one of the most famous knife companies from Finland, is made for surface mounting, blade height 22 mm, length - 70 mm, butt thickness 3.5 mm. The total length of the workpiece is 156 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 Necker 70/F blade is not a classic Finnish puukko, it is distinguished by its 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.
There are 4 mounting holes and one large technological cutout on the shank for surface mounting, 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, under the Corby coupler (Corby Hole) by 4.6 mm and two on the sides of it - pin (Pin Hole) under 3.2 mm. Traditionally, the installation of overlays for this knife is done using only two holes - a lanyard hole and a hole for a tie, but for beauty and reliability, you can install the 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 Sandvik 12C27. The guide to steels says about it that it is a corrosion-resistant martensitic chromium knife steel of the Swedish company Sandvic AB (Sweden), produced since the 60s of the XX century, which has a low content of impurities - sulfur and phosphorus. In other words, Sandvik 12C27 is perhaps the most balanced knife steel that simultaneously has excellent sharpening characteristics (easy to sharpen - hard to dull, and it really is!), high strength and corrosion resistance. For the curious, the density of Sandvik 12C27 steel is 7.7 g / cm3, and its chemical composition is as follows:
Chemical composition in % (nominal): Carbon (C) - 0.60% Chromium (Cr) - 13.5% Molybdenum (Mo) - Silicon (Si) = 0.40% Manganese (Mn) - 0.40% Unique The characteristics of Sandvik 12C27 steel, which allow it to always be at the top of the knife ratings, is simply explained, Sandvik 12C27 is one of the few steels designed specifically for the manufacture of knives. Most other steels, which have compositions that are much more burdened with master alloys and many times higher cost, are usually developed for other narrower technological tasks that are far from knife topics (for example, for the manufacture of molds or cutting tools with large sharpening angles, etc.). P.). Therefore, for the manufacture of blades, such steels can only be adapted with varying degrees of success.
The production technology of Sandvik 12C27 steel is constantly being improved, which leads to a constant improvement in quality indicators, an increase in density and purity, and an improvement in the fine microstructure of carbides. Therefore, today's Sandvik 12C27 steel is very different from the prototype 45 years ago.
Sandvik 12C27 has high toughness, excellent cutting retention under various mechanical loads and good corrosion resistance. All this makes Sandvik 12C27 the most recommended steel for the production of high-quality top-class knives.
Sandvik 12C27 steel is hardenable from 54 to 61 HRC. However, like most Finnish knives, Sandvik 12C27 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.