EARTH AND BLOOD II handmade knife by PAVL GONCHARENKA, steel - CPM® REX® 121™, 68-69 HRC

ТЕХНІЧНІ ХАРАКТЕРИСТИКИ:

Назва ножа: EARTH AND BLOOD II handmade knife by PAVL GONCHARENKA, steel - CPM® REX® 121™, 68-69 HRC
Тип ножа: Фіксований клинок
Бренд: Студія "Ножі ручної роботи Павла Гончаренка"

Steel grade: REX121 high carbon steel blade in stainless damascus laminate
Steel sheet: 1-piece, forged, mounting handle is embedded in epoxy glue
Blade Sharpening Angle: 36 Degree Pointed
Descents: Straight
Reduction: 0.2 mm
Blade hardness: 68-69 HRC
Total length: 280 mm
Blade length: 145mm
Blade width: 34mm
Blade thickness: 4.0 mm
Handle length: 135mm
Handle thickness: 32mm
Grinding of the blade: The finish of the blade is mirror polishing
Bolster and back material: Buffalo horn
Handle Material: Buffalo Horn, Neuselber, Stabilized Mammoth Tooth, Stabilized Maple/Acrylic Cap Hybrid, Mosaic Neck Tube. Lanyard made of braided leather cord 3 mm, bead made of buffalo horn and mammoth tooth
Handle Color: Red-Black
Handle Impregnation: Yes
Handle Cover: Yes
Lace hole (for lanyard): Yes
Strap: 3mm leather cord, hybrid beads
Scabbard: Stabilized maple/acrylic hybrid, hand-carved wood, cheprak calfskin, Italian vegetable-tanned genuine leather, treated with water-repellent finish and impregnated with protective solutions, stitched with waxed thread.Manual embossing of the invoice. Insert from stabilized mammoth tooth, bead from hybrid. The hanger is free, removable

Model: EARTH AND BLOOD II knife handmade by Pavel Honcharenko, steel REX121 68 HRC
Model number: 135
Country of birth: Ukraine
Artisan: Master Pavlo Honcharenko, Ivankiv, Ukraine Pavlo Honcharenko studio of handmade knives
Best use: Multi-purpose: hunting, fishing, cutting, slicing, etc
Knife condition: New
The price is indicated with the sheath.

A sharpened knife is not a cold weapon.

Our knives are very sharp, so be very careful when opening and handling them. We are not responsible for injuries caused by the use of our knives.
Our products are intended for legal use by responsible buyers only. We will not sell our products to anyone under the age of 18.

Availability changes regularly, after confirming your order we will notify you of availability or when the item is ready. The product may differ slightly from the one shown in the photo.

Crucible CPM® Rex® 121® powder steel

CPM® REX® 121 (Crucible Industries LLC) is a high-vanadium-cobalt tool steel designed to achieve the high wear resistance, hardness and reddening characteristic of high-speed steel. Its excellent red resistance (red resistance is a characteristic of the heat resistance of steel, which means the ability of steel to retain high hardness and wear resistance obtained as a result of heat treatment when heated to red tempering temperatures) ensures a higher cutting speed compared to other high-speed cutters. Excellent wear resistance (due to the high vanadium content) helps maintain the sharpness of the edge at high cutting speeds.

Powdered high-speed steel was developed at the end of the 60s of the last century in Sweden. The method of powder metallurgy allows introducing a larger number of alloying elements into steel, while there is no decrease in strength and machinability.

Powder steel, unlike ordinary steel, is fed in molten form through a special nozzle through a stream of liquid nitrogen. Steel quickly hardens in the form of small particles. The result is a powder with a uniform arrangement of carbides (the place of accumulation of carbides is the nucleation of cracks). Carbides in steel perform the same function as stones on the street: they (carbides) are harder than the steel that surrounds them, and contribute to increasing its wear resistance.

The resulting powder is sifted and placed in a steel container in which a vacuum is created. Next, the contents of the container are sintered at high temperature and pressure - in this way, the homogeneity of the material is achieved. This process is called hot isostatic pressing. After that, the steel is processed by pressure. The result is a high-speed steel with very small particles of carbides evenly distributed in the steel base. The obtained steel can be rolled in the traditional way, as well as serial grades of steel, as a result of which its increased strength is achieved.

Differences in wear resistance indicators of different brands of powder steel are explained by the presence in their composition of different carbides in different proportions and with different uniformity of distribution throughout the volume of steel. Of two steels that have approximately the same hardness, the one that contains more carbides or is harder will be more wear-resistant.

CPM REX 121 fills the gap between high-alloy tool steels and carbide materials (tungsten carbide, second only to diamond in hardness). Can be used in cutting tools where high cutting speeds require higher heat resistance, but the carbide tool is too brittle, or in tools with high wear resistance (stamps) where the carbide tool is also very brittle.

CPM Rex 121 was developed in 1998. In terms of hardness, it is truly a champion, capable of reaching a hardness of 70-72 HRC. The official Rockwell C scale has a maximum value of 70 HRC.

Also extremely high wear resistance. Difficult to grind and therefore difficult to sharpen. Sharpening this alloy can be a nightmare even at 68HRC, and it will be exponentially harder at higher hardnesses. With such a large number of alloying elements, many carbides have formed, and some of them are not very small. The steel works better with a rough sharpening (the photo below shows a comparison of the microstructures of popular steel brands and the microstructure of CPM Rex 121).

There are many hard steels in the world, but according to renowned master knife maker Gary Creely, the REX 121 takes them to a new level. "The steel has a low Rockwell hardness of 40 even after annealing, and after heat treatment it is close to 70 HRC." The steel is described as Crucible's answer to competing steel Carpenter CTS – Maxamet Micro-Melt Alloy. Although they are very similar in chemical composition, REX 121 contains 1% more carbon and 3% more vanadium. The practical result of this hardness value is unprecedented sharpness retention. REX 121 knives will far outperform even other high quality steels such as M4 and S35VN.

The steel is not very impact resistant and can break with abuse, but Creely believes that excellent edge retention is more useful than high strength in the small knives we carry every day. This steel is best suited for smaller knives. If the REX 121 finds its way to a larger blade, the chances of it being misused will increase dramatically.

The disadvantage of REX 121 is that it is so hard that it can damage ordinary abrasive materials. "In short, you need to use diamond abrasives to sharpen this type of steel," Creeley notes. "If you choose your favorite Japanese waterstone, there is a good chance that the steel will cut your waterstone harder than the stone will sharpen the steel."

Steel composition:

From 3.4% - the carbon content in the alloy is 3.4%. Carbon is the most important element of steel, it increases its strength and gives the metal good hardness.

Сr 4.0% - the chromium content in the alloy is 4.0%. Chromium is a grayish-white shiny hard metal. Chromium affects the ability of steel to be hardened, gives the alloy anti-corrosion properties and increases its wear resistance. It is contained in stainless steel of any brand.

Mo 5.0% - the molybdenum content in the alloy is 5.0%. Molybdenum is a silver-white metal. Molybdenum is a refractory element, it prevents brittleness and fragility of the blade, giving it the necessary rigidity, making it quite resistant to high temperatures.

V 9.5% - the content of vanadium in the metal is 9.5%. Vanadium is a grayish-white shiny metal that has great hardness. It is responsible for elasticity and strengthens the properties of chromium, gives the metal inertness to aggressive chemical environments.

W 10.0% C tungsten content in the alloy is 10.0%. Tungsten is a light gray metal. The most refractory metal has a melting point tpl = 3380 °С. It is used to create alloys with high strength. Tungsten is used as one of the main components or an alloying element in the production of high-speed steels.

Co 9.0% - the cobalt content in the metal is 9.0%. Cobalt is a silver-white, slightly yellowish metal with a pink or bluish tint. Increases heat resistance, improves mechanical properties. Machining tools are made from alloys using cobalt: drills, cutters, etc. etc.

S 0.03 - 0.12% - sulfur content in metal - 0.03 - 0.12%. Sulfur, like phosphorus, belongs to harmful technological impurities in steels and alloys. Increasing the sulfur content significantly reduces the mechanical and physico-chemical properties of steels, in particular, plasticity, impact toughness, abrasion resistance and corrosion resistance. The limits of sulfur content as a technological impurity are 0.035...0.06%. Due to the extremely fine and homogeneous microstructure of SRM (Crucible Particle Metallurgy proprietary technology process), if desired, sulfur can be added to improve machinability. A higher sulfur content benefits the tool maker by making it easier to manufacture and the tool user by making it easier to resharpen. The CPM process ensures that the additional sulfur will not affect the strength of the tool.

Stabilized Ash Suvel

RESINOL, Stabilization of wood - a method of processing, as a result of which the wood is given higher strength and improves its decorative qualities, while preserving the natural pattern. That is, stabilized wood combines the advantages of synthetic materials with natural natural beauty. In the course of stabilization, the wooden workpiece seeps through, forming a polymer monolith that securely binds the wooden components and minimizes harmful factors affecting the human body (you can familiarize yourself with the list of harmful factors encountered during the manufacture and operation of wooden products HERE). Stabilized wood has excellent mechanical properties during processing - there are no differences in density along the body of the workpiece (which allows more accurate drilling and sawing), it is polished without clogging the skin, it is polished to a mirror. At the same time, the appearance and tactile sensations remain inherent to ordinary wood.

In addition to the intricate pattern on the surface of the product, stabilized wood provides a number of undeniable advantages over traditional materials:
• High density;
• hardness;
• Resistance to changes in temperature and humidity of the environment;
• Immunity to ultraviolet radiation;
• Ability to withstand short-term heating by an open flame, without losing its quality characteristics and without being deformed;
• Impermeable to various liquids, including oils;
• Resistance to solvents of organic origin;
• Excellent decorative properties – stabilized wood lends itself well to manual and mechanical processing (does not clog sandpaper).

Bars of stabilized wood are often used to make knife handles and other cutting tools. Stabilization, as a rule, increases the weight of the workpiece up to one and a half times (depends on the wood), so a well-finished bar should sink in water.
As raw materials for stabilization, sawdust, sawdust, and sapwood of various deciduous tree species are most often used.
             A cap is a rounded growth on a tree (trunk or branches), filled with small wooden nodules of dormant (overgrown, but not developed) kidneys. Many branches often grow from such growths. Since each such kidney has a formed ring-like embryonic structure, a cut of such wood has a characteristic "malachite" texture, which looks very beautiful on handles, especially if it is "revealed" with the help of impregnations and dyes. Cap carving is rarely used because the carving pattern is superimposed on the wood texture pattern.
             Souvel is a type of wood with structural changes in the fibers other than kapa. Kidneys and ring structures are missing from the picture. In fact, the wood of suveli has a curved wavy-linear texture (from the Old Russian "svyl" - twisted), which is formed by twisting the tree itself, twisting the annual rings of the tree. Therefore, the pattern of the souvel is less intense and saturated than that of the capa, usually represented by simply curved lines of wood fibers, this texture does not overshadow the carving elements on the handle.
            Both sapwood and sapwood are very hard woods, especially sapwood, and are well suited for making handles not only because of their beauty.
            Split is another wood pathology that is often used to make knife handles. Split is the result of life activity of flexible colonies or bacteria on wood, which forms colored spots or streaks uncharacteristic of the breed. Often, different types of fungus are specially planted, for example, on beech or maple to obtain affected wood. Split reduces the strength of wood and worsens its properties, therefore, wood affected by the fungus is used only in a stabilized form.