TANTO-AYKUTI knife handmade by master Vasyl Dyachyk, buy order in Ukraine, REX 121™ steel in stainless resistant Damascus cover, 68 HRC
- Brand: Студія ножів ручної роботи ВАСИЛЯ ДЯЧИКА
- Product Code: ТАНТО-АЙКУТІ - ніж ручної роботи ВАСИЛЯ ДЯЧИКА
Загальна довжина клинка mm: | 390+-5 mm |
Матеріал леза | Blade - CPM REX 121 brand steel in stainless Damascus lining - tool powder fast-cutting alloy of the American company Crucible Industries LLC |
Твердість клинка (метал): | Hardness - 68 HRC |
Матеріал руків'я: | Grenadyl, African blackwood or mpingo (Swahili mpingo), wood of the Dalbergia melanoxylon tree of the Dalbergia genus. Grenadyl is a type of wood, one of the most valuable in the world. Guarda and the back of Habaka mokume gane |
Довжина леза | 250+-5 mm |
- Availability: Під замовлення
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Description
Name of the sword: TANTO-AYKUTI knife handmade by master Vasyl Dyachyk, buy order in Ukraine, REX 121™ steel in stainless resistant Damascus cover, 68 HRC
Type of sword: Hand-held
Brand: VASYLYA DYACHYKA Knife Workshop
You can additionally order: (paid separately)
VIP case made of hard wood, covered with paint and additionally branded varnish: UAH 4,200
Standard box, burned from pine: UAH 2,300
Stand for a knife: UAH 1,500
Main Features:
number: 021
Country of birth: Ukraine
Craftsman: Master Sergiy Dityuk, Dnipro, Ukraine, Studio of exclusive hand axes works of SERHIA DITYUK
Best use: Multifunctional: hunting, fishing, cutting carcasses, chopping firewood, cleaning the area, etc.
Our products are intended for legal use only by responsible buyers. We will not sell our products to anyone under the age of 18.
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 red-hardness characteristics of high-speed steel. Its excellent red resistance ( red resistance is a characteristic of the heat resistance of steel, indicating the ability of steel to retain high hardness and wear resistance obtained as a result of heat treatment when heated to red-hot temperatures ) provides a higher cutting speed compared to other high-speed cutters. Excellent wear resistance (due to high vanadium content) helps maintain a sharp edge at higher cutting speeds.
Powder high-speed steel was developed in the late 60s of the last century in Sweden. The powder metallurgy method makes it possible to introduce more alloying elements into steel without reducing strength and workability.
Powdered steel, unlike ordinary steel, is fed in molten form through a special nozzle through a stream of liquid nitrogen. The steel quickly hardens into small particles. The result is a powder with a uniform arrangement of carbides (the place where carbides accumulate is the place where cracks nucleate). Carbides perform the same function in steel as cobblestones on the street: they (carbides) are harder than the steel surrounding them and help increase 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, thereby achieving uniformity of the material. This process is called hot isostatic pressing. After this, the steel is pressure treated. The result is a high-speed steel with very small carbide particles evenly distributed in the steel base. The resulting steel can be rolled in the traditional way, just like commercial steel grades, resulting in increased strength.
Differences in the wear resistance of different grades of powder steel are explained by the presence of different carbides in their composition in different proportions and with different uniformity of distribution throughout the entire 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 bridges the gap between high-alloy tool steels and carbide materials ( tungsten carbide, which is second only to diamond in hardness ) . Can be used in cutting tools where high cutting speeds require higher heat resistance but carbide tools are too brittle, or in high wear resistant tools (dies) where carbide tools are also too brittle.
CPM Rex 121 was developed in 1998. In terms of hardness, this is truly a champion, capable of achieving a hardness of 70-72 HRC. For information, officially the 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 so many alloying elements, steel has a lot of carbides, and some of them are not very small. Steel works better with coarse sharpening (the photo below shows a comparison of the microstructures of popular steel grades and the microstructure of CPM Rex 121).
There are many hard steels in the world, but according to renowned knife maker Gary Creely, the REX 121 takes it to the next 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 rival Carpenter CTS steel, 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 edge retention. Knives made from REX 121 will significantly outperform even other high-quality steels such as M4 and S35VN.
Steel is not highly impact resistant and can break if abused, 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 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 conventional abrasives. “In short, you need to use diamond abrasives to sharpen this type of steel,” notes Creeley. “If you choose your favorite Japanese water stone, there is a good chance that the steel will cut your water stone harder than the stone will sharpen the steel.”
Steel composition:
C 3.4% - the carbon content in the alloy is 3.4%. Carbon is the most important element in steel; it increases its strength and gives the metal good hardness.
Cr 4.0% - chromium content in the alloy is 4.0%. Chrome is a grayish-white, shiny, hard metal. Chromium affects the ability of steel to harden, gives the alloy anti-corrosion properties and increases its wear resistance. Contained in stainless steel of any grade.
Mo 5.0% - the molybdenum content in the alloy is 5.0%. Molybdenum is a silvery-white metal. Molybdenum is a hard-melting element; it prevents the blade from becoming brittle and brittle, giving it the necessary rigidity and making it quite resistant to high temperatures.
V 9.5% - the vanadium content in the alloy is 9.5%. Vanadium is a greyish-white shiny metal with great hardness. It is responsible for elasticity and enhances the properties of chromium, making the metal inert 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 tmelt = 3380 °C. Used to create alloys with high strength. Tungsten is used as one of the main components or alloying elements in the production of high-speed steels.
Co 9.0% - the cobalt content in the alloy is 9.0%. Cobalt is a silvery-white, slightly yellowish metal with a pinkish or bluish tint. Increases heat resistance, improves mechanical properties. Processing tools are created from alloys using cobalt: drills, cutters, etc. etc.
S 0.03 - 0.12% - sulfur content in the alloy - 0.03 - 0.12%. Sulfur, like phosphorus, is a harmful technological impurity in steels and alloys. An increase in sulfur content significantly reduces the mechanical and physicochemical properties of steels, in particular, ductility, impact strength, abrasion resistance and corrosion resistance. The limits for sulfur content as a technological impurity are 0.035...0.06%. Due to the extremely fine and uniform microstructure of CPM (Crucible Particle Metallurgy's proprietary powder metallurgy process), sulfur can be added if desired to improve machinability. Higher sulfur content benefits the tool manufacturer by making it easier to manufacture and the tool user by making re-sharpening easier. The CPM process ensures that additional sulfur does not have a detrimental effect on tool strength.
It is worth remembering that if you use the ax for its intended purpose and with careful handling, the ax will serve you for a very, very long time
Гренаділ (Grenadil)
Luxury Genuine Wood Grenadil by MJ
Grenadil, African blackwood or mpingo (Swahili mpingo), the wood of the Dalbergia melanoxylon tree of the genus Dalbergia.
Grenadyl is another type of wood, one of the most valuable in the world. It belongs to the Dahlberg genus of the legume family. It also has names: African black tree, mpingo. Grenadyl is common near Kenya, Tanzania, and Mozambique. The core part is deep black, sometimes with a red tint.
Grenadille (Mpingo, African ebony) singing ebony. Grenadilla wood has excellent acoustic qualities, which is simply necessary for the creation of elite musical instruments, most often wind instruments. Due to long growth (over sixty years) and illegal felling, the tree was among the endangered. But the higher the value of products made of it. Also, unique jewelry and thematic accessories are made from grenadilla.
The color of dense, shiny wood varies from red to pure black. It is usually sawn into small logs, leaving the bright yellow sapwood to avoid cracking during the long drying process. Market prices for high-quality grade A grenadyl are always high. The acoustic properties of grenadyl are especially valued in the manufacture of wind musical instruments, mainly clarinets, oboes and bagpipes. Mahogany people from ancient Egypt also valued this tree. There is evidence that this wood was used as ballast on merchant ships and some craftsmen used old grenadilla ballast removed for better sound when making Northumbrian horns.
Due to overexploitation, the mpingo is endangered in Kenya and in need of protection in Tanzania and Mozambique. The trees have been harvested excessively, partly due to poaching and smuggling into Kenya, but also because of their slow growth - a tree takes up to 60 years to mature.
Confusion of terminology
- African blackwood (grenadyl) (eng. african blackwood) is not related to ebony. The name "ebony" is attached to a number of trees of the genus Diospyros; their wood is less shiny and more fragile.
- The genus Dalbergia includes other famous types of wood, such as rosewood and cocobolo. The name rosewood is accepted as a general description of the wood of various species of this genus and some others.
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