DNIPROVSK WAVE knife handmade by master ALEKSANDR KASINEC (Steel laminate Rex 121CPM™ 67 HRC)

SPECIFICATIONS:

The name of the knife: DNIPROVSK WAVE knife handmade by master ALEKSANDR KASINEC (Steel laminate Rex 121CPM™ 67 HRC)
Knife type: Fixed blade
Brand: Studio of exclusive handmade knives by master ALEKSANDR KASINEC

DNIPROVSK WAVE knife handmade by master ALEKSANDR KASINEC (Steel laminate Rex 121CPM™ 67 HRC)
Sheath: 4.0 mm Italian genuine vegetable-tanned full-grain calfskin, treated with water-repellent finish and impregnated with protective solutions, hand-stitched with waxed thread. Manual embossing of the invoice. Insert - python skin. A free pendant and a pendant on a belt (by the famous craftsman with leather - Andriy Kurinny). Wooden case included.

Model: DNIPROVSK WAVE knife handmade by master ALEKSANDR KASINEC (Steel laminate Rex 121CPM™ 67 HRC)
Model number: 028
Country of birth: Ukraine
Artisan: Master Oleksandr Kasinec (ALEKSANDR KASINEC), Uzhgorod, Ukraine Studio of exclusive handmade knives by master ALEKSANDR KASINEC
Best use: Multi-functional: 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 open and use very carefully. We are not responsible for injuries related to the use of our knives.
Our products are intended for legal use only by responsible buyers. We will not sell our products to anyone under the age of 18.

Availability changes regularly, upon confirmation of your order, we will inform you about the availability or when the product will be ready. The product may differ slightly from the one shown in the photo.

CPM 121 REX - red-resistant steel
The CPM Rex 121 tool steel composition was developed in Sweden in the middle of the 19th century. The American company Crucible Industries LLC produces a powder high-speed cutting alloy.

Knives made of CPM Rex 121 steel.

The CPM Rex 121 brand alloy occupies an intermediate position between high-alloy (high-strength) and hard alloy steels. The material of this brand is intended for the manufacture of cutting tools with high wear resistance and a hardness of 70-72 HRC.

For products made of this steel, it is better to use coarse sharpening, since its grinding, and therefore sharpening, are performed with great difficulty. REX 121 contains 1% more carbon and 3% more vanadium than the competing Carpenter CTS alloy.

The SRM REX 121 brand has low impact strength parameters. Products made of this material are prone to damage when exposed to them. Fits a small size.

Pros and cons for knives

Alloys obtained by the method of powder metallurgy have a uniform structure of small grains. It is this condition that gives the products special cutting properties. CPM REX tool steel is used in the production of metal cutting tools. The tools have the following advantages:

• the resistance of the knife blade to bending is provided by the alloying procedure, the addition of elements that contribute to the increase of this parameter;
• increasing the mechanical parameters of the blade, its strength depends on the content of additives in the material: tungsten, nickel, chromium and other elements;
• hardening, thermal treatment of metal in the form of heating it to the critical point (the limit temperature at which the destruction of the metal's crystalline structure is observed) and its sharp cooling. The procedure is designed to increase strength and hardness.

Knives made of powder tool steel have the following disadvantages:

limit parameters of alloying, i.e. alloying components can be added in certain quantities while observing their ratio. Otherwise, the properties will not meet the specified requirements;
powder steel, in addition to alloying additives, contains non-metallic extraneous inclusions. This error can be overcome by modern production and processing technologies;
the high cost of the material is caused by the high cost of production and the limited dimensions of the blanks.
As a result, powder steel of the CPM 121 REX brand is a unique material for the manufacture of cutting tools of special strength.

Chemical composition

Steel is an alloy, the main components are iron and carbon, the ratio of which determines the grade. Additives are important, they are used to develop alloys of the desired composition.

CPM 121 REX iron-carbon alloy has the following composition:

• carbon content (C) – 3.4%, its presence in the alloy ensures strength and hardness of the material;
• the amount of chromium (Cr) is 4.0%, its presence supports the ability to be hardened, increases resistance to wear and corrosion. It is a mandatory element of all grades of steel;
• the molybdenum (Mo) percentage of this grade is 5.0 units. The silver-white metal from Mendeleev's periodic table represents a refractory element. Its presence provides a certain rigidity, stability when heated to high temperatures, prevents brittleness and fragility of products;
• V (vanadium) is a shiny grayish-white element that makes up 9.5% of the alloy. As a metal of high hardness, vanadium increases the properties of chromium. Inertness to aggressive environments provides the addition of this element;
• the content of W (tungsten) according to the production technology of this brand is 10.0%. The melting point of tungsten, a gray metal, is 33800C. Addition of tungsten to the metal gives it high strength characteristics. It is a mandatory component in steel high-speed alloys;
• 9.0% (Co) of cobalt in the alloy ensures the heat resistance of the steel and its mechanical characteristics. Cobalt is a silver-white or yellowish metal, it can have a pink or blue tint. Alloys with the addition of cobalt are used for the manufacture of tools intended for processing materials - drills, cutters, milling cutters, etc.;
• The presence of S (sulfur) is necessary to increase the machinability characteristics of products. But its content is absorbed in 0.12%. A higher content of this element affects such characteristics as impact strength, abrasion resistance, and corrosion resistance.
• SRM Rex 121 steel, due to its properties, is used for the manufacture of high-speed cutting products, which increases their effect on the processed materials.

CPM in the marking stands
for Crucible Particle Metallurgy.

Knife made of SRM Rex 121 steel.
Properties
Steel is a unique material, the mechanical, physical and technological properties of which are determined by its composition. CPM steel is obtained using modern, constantly improving technologies, which include powder. This type of tool steel has the following properties.

Mechanical:

• high hardness and strength, they are provided by carbon, the percentage of which is 3.4%;
• high indicators of wear resistance depends on the 9% cobalt content;
• unsurpassed cutting ability and stability of the blade at small sharpening angles.

Chemical:

• steel is inert, it is not oxidized by oxygen, does not react with harmful substances;
• has high indicators of corrosion resistance;
• has high heat resistance, it retains its strength properties.

Technological:

• characteristic resistance to such loads as shocks, bends and others to which knives and cutting tools are subjected;
• liquid fluidity is characteristic of molten steel, in this state it fills the entire space in which it is located;
• hardly amenable to cutting. Special diamond equipment is required for blade sharpening.

Machining recommendations
CPM Rex 121 alloy is a very hard high-speed steel with numerous advantages. However, the advantages, in some cases, turn into disadvantages. Difficulties are revealed when using ready-made products, namely knives.

This type of product made of powder steel is difficult to sharpen, so it is better to use the services of specialists to perform this procedure.
This is due to the fact that unskilful actions can lead to the appearance of microcracks, irregularities, staining of the edge of the blade.
Application
Powder steels belong to expensive materials, so their use is quite limited. Blades made of CPM Rex 121 steel are found in souvenir and collectible edged weapons, as well as gift items. Exclusive gift knives can be purchased in specialized stores and online marketplaces:

Comparison of CPM Rex 121.
HAP 72 is a Japanese analogue of the knife metal of the American company Crucible Industries LLC. The purpose of this brand is the production of premium class knives and cutting tools of a high category of strength, hardness, and wear resistance. In knife production, the HAP 72 brand is recognized as the best. The composition of the components of this grade of steel in percentages: Carbon - 2.10%, Chromium - 4.0%, Molybdenum - 8.2%, Vanadium - 5.0%, Cobalt - 9.5%, Tungsten - 9.5%.

Analogues of CPM REX 121 knife steel, the American manufacturer Crucible Industries LLC presents a series of grades S60V, S90V, CPM3V, produced using Crucible Particle Metallurgy (CPM) technology.

Well,  you can buy a powder steel knife  on our website  knife.net.ua  or by contacting us by phone +380961711010

It is worth remembering that when using a knife for its intended purpose and with careful handling, the knife will serve you for a very, very long time.

​HANDLE MATERIAL MAMMUT TOOTH

Mammoth tooth is a rare raw material used to make decorative items, such as knife handles, pistol grips, and jewelry. This is a unique natural element, which can be obtained infrequently, so its cost is quite high.

Today, a mammoth tooth, after a certain processing (stabilization), is widely used by master knifemakers. Stabilization is the process of polymerizing a material under vacuum with or without fat-soluble dyes, while the material is impregnated with polymeric substances through and through.

HANDLE MATERIAL MAMMUT TOOTH

Mammoth tooth is an ornamental material of animal origin. Its exceptional feature is the fact that its source is extinct animals - mammoths. Paleontologists found that they lived on Earth about 10 thousand years ago, and their number was very large. The teeth of mammoths were not permanent, and changed about four times during their lives. Fallen teeth, which modern scientists find during excavations, become the basis for decorative elements, among which there are knife handles.

Due to the long stay in the soil, the material acquired a very unstable structure - the enamel received stone hardness, and the dentin, on the contrary, became loose. But modern material stabilization technologies have helped turn mammoth teeth into an excellent base for creating luxurious knife handles. The polymer composite provides products with resistance to corrosion and moisture, and the natural base gives a unique texture and intricate pattern.

Material Features

Mammoth molars are used to create a variety of products. Outwardly, they look like elephant teeth, but they are much larger and have a different shade. Given the historical value and rarity, the mammoth tusk is especially highly valued, since this animal died out long before our era. The tusks of prehistoric giants can be found not only in paleontological museums, but also on the shelves of jewelry stores, they are used to decorate the interior, they are used to create various decorative elements - of course, not in their original form, but in a processed one.

The age of the material, according to scientists, is 10-40 thousand years. How mammoths lived is not fully understood to date. However, the remains of these giants found by scientists, their bones, teeth, even whole carcasses, allowed scientists to make serious progress in this area of ​​research. The available data made it possible to find out what the appearance of mammals was, what they ate, in what climatic conditions they lived, what kind of behavior they had (for example, they led a herd or solitary existence).

The mammoth ate almost the same as the modern elephant: its diet was plant foods. In the modern world, an animal could eat coniferous plants. They preferred roughage, which they chewed without difficulty with their strong jaws and teeth like large plates. An interesting feature of the mammoth organism was that as the old tooth wore out, a new one grew, which displaced the old one and took its place. Thus, the animal could change its teeth several times in a lifetime. Completely all the teeth changed in about a ten-year interval, and the average life expectancy of a mammoth was 40 years. In other words, one animal could survive on average four complete changes of molars. It is due to this feature that people often find individual worn-out mammoth teeth, but do not meet other traces of it.

Appearance

If you look at the tooth of a mammoth, you can see a heterogeneous surface with ribbed edges. Bone, enamel and soft tissue alternate in this case. The material has a rather complex structure:

its basis is dentin.

The dentin layer is covered with a protective enamel.

It is worth noting that the mammoth had only 4 molars and 2 tusks, which protruded outward and served mainly for self-defense.

After special processing, the molar can be used to make a variety of jewelry products. The density of the material is very high and resembles a stone. In order to process such a product, the master will need to spend a lot of time and effort.

Raw material stabilization

So that the tooth and tusk do not collapse during use and the manufacture of the product from it, stabilization technology is used. This is a critical stage of processing, in which the following technologies are used:

Polycondensation.
vacuum processing.
Application of special dyes.

All voids of the tooth are filled with a polymeric substance, due to which the base acquires reliable protection from climatic influences. Such a product does not deform, cracks do not appear on it, it becomes able to withstand high temperatures. The appearance of the material also changes, becoming more attractive and unique.
 

Before the advent of this technology, mammoth teeth and bones were rarely used for making souvenirs, as they did not have sufficient strength due to the large number of cracks and delaminations inside. In addition, tooth enamel has a high hardness, which, when processed, quickly renders the saw unusable. A stabilized product is much easier to post-process. The mammoth tooth has become especially popular in the manufacture of knife handles. It looks unusual, attractive, and if you add dye, you can create a unique pattern that can give even such a rare thing a special personality.​

High-quality and original steel inserts are a wonderful decoration of exclusive and unique knives of the Studio of exclusive handmade knives Studio of exclusive handmade knives by master ALEKSANDR KASINEC (Ukraine), which offers to order and buy online store https://knife.net.ua