Tungsten and Tungsten Carbide: What You Should Know About Them

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 15:08
Tungsten and tungsten carbide have become increasingly popular options for jewelry, especially when it comes to rings. Let’s take a look at the characteristics of these two materials, and see what you should know about them when shopping for jewelry.
 
What Is Tungsten?
 
Tungsten is a metal that is extremely hard and melts at a very high temperature. It is also very dense, and the jewelry made of it feels surprisingly heavy.
 
Because of its durability, tungsten is a preferred material for buyers looking for jewelry that will last a very long time. However, the physical properties that make this metal so robust are also the reason jewelers find tungsten relatively hard to work with.
 
What Is Tungsten Carbide?
 
When tungsten is mixed with carbon, the resulting compound is called tungsten carbide. This material is even more durable than tungsten. The tungsten carbide used in jewelry making is usually mixed with a small amount of nickel.
 
Not only is tungsten carbide harder than tungsten, but it is also even tougher to fashion into a ring or another jewelry piece.
 
What You Should Know About Tungsten Carbide
 
Let’s look at the most important characteristics of tungsten carbide that you should be aware of when shopping:
 
Hypoallergenic: Tungsten carbide doesn’t cause allergic reactions when worn. Although the tungsten carbide used in jewelry usually does contain some nickel, this metal usually constitutes a small part of the final mixture. That’s why you shouldn’t worry about skin irritation if you are allergic to nickel and plan on wearing tungsten carbide jewelry.
 
Do make sure, however, that the vendor guarantees that the tungsten carbide jewelry offered is hypoallergenic. Different manufacturers have different standards for what their products contain, so it never hurts to check.
 
No scratches: One of the biggest selling points of tungsten carbide is that it is scratch resistant. It is very hard to make a dent or nick in a tungsten carbide ring under normal circumstances.
 
Tungsten carbide’s extreme durability means that if you have jewelry made of this material, it will stay polished for very long and won’t lose its luster with time, unlike gold or silver. Many companies selling tungsten carbide jewelry guarantee that their products won’t scratch and offer to replace them if you notice any scratches.
 
Cannot be resized: Tungsten carbide’s durability comes at a price: Rings made of this material cannot be resized. That’s why you should choose your size carefully to make sure your new ring is not too snug or loose. If, however, you finger size changes with time, you may be able to exchange your tungsten carbide ring for another of a different size: Some vendors offer such an option, so make sure to check when shopping.
 
Tungsten Carbide vs. Tungsten
 
People often use the terms tungsten and tungsten carbide interchangeably. However, there are differences in the properties of these two materials.
 
First, tungsten scratches more easily than tungsten carbide. Rings made only of tungsten are not really scratch resistant, so you shouldn’t expect them to stay as shiny as the ones made of tungsten carbide.
 
Second, tungsten jewelry often contains cobalt, whereas pieces made of tungsten carbide are usually mixed with nickel. The problem is that when cobalt comes in contact with your skin, the metal can cause irritation. Furthermore, cobalt can also oxidize and cause your tungsten jewelry to change in color.
 
 
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What is Tungsten Carbide?

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 15:02
If you have heard a lot about tungsten carbide but are unsure of what it is or what benefits it could bring to your or your business, stick around. Tungsten carbide should be viewed as a chemical compound, formed in an inorganic way, which hosts the same number of tungsten atoms and carbon. It some ways, this helps to explain the name, being a balanced mix of tungsten and of carbon but many people will just refer to tungsten carbide and carbide.
 
Tungsten carbide has a great number of uses but taken at its simplest level, it is available in a powder, grey in colour. However, this powder can be taken and pressed which is then processed into a variety of shapes. These shapes can provide the foundation for many products including male jewellery, tools, abrasives and even industrial machines.
 
The fact that tungsten carbide is such a versatile compound means that it carries a great number of benefits and uses. The physical elements brought together and maintained by tungsten combined are quite rare but this only helps to make it a better foundation for so many products. Some of the biggest strengths of tungsten carbide lies in the fact that it is very durable and can resist wear and tear. With respect to tungsten carbide being cut or engraved, this means that there is just a limited number of materials available that can do the job. If you are looking to engrave or professionally cut tungsten carbide, a diamond or a diamond abrasive will be one of the best ways to get the job in an efficient and effective manner.
 
Tungsten carbide holds a high tensile strength but this means that it can become fragile or unreliable under extreme pressure. Anyone interested in tungsten carbide’s point of melting should note that it comes out at 2,870 °C which is equivalent to 5,200°F. In order to be able to boil tungsten carbide, the temperature levels have to be even higher, which means you would be looking at a heat of around 6,000 °C or 10,382 °F.
 
One of the most ways to create this compound is done by reacting carbon and tungsten at a temperature level of between 1,400 to 2,000 °C which is the equivalent of 2,552 to 3,632 °F. One of the major uses of tungsten carbide comes with industrial use with tools for cutting and even mills being made of the material.
 
 
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Tungsten Carbide Powder Typical Applications

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 14:54
1) Machine tools
 
Carbide cutting surfaces are often used for machining through materials such as carbon or stainless steel, as well as in situations where other tools would wear away, such as high-quantity production runs. Most of the time, carbide will leave a better finish on the part, and allow faster machining. Carbide tools can also withstand higher temperatures than standard high speed steel tools. The material is usually called cemented carbide, hardmetal or tungsten-carbide cobalt: it is a metal matrix composite where tungsten carbide particles are the aggregate and metallic cobalt serves as the matrix.
 
2)  Military
 
a) Tungsten carbide is often used in armor-piercing ammunition, especially where depleted uranium is not available or not politically acceptable. The first use of W2C projectiles occurred in German Luftwaffe tank-hunter squadrons, which used 37 mm autocannon equipped Junkers Ju 87G dive bomber aircraft to destroy Soviet T-34 tanks in World War II. Owing to the limited German reserves of tungsten, W2C material was reserved for making machine tools and small numbers of projectiles for the most elite combat pilots, like Hans-Ulrich Rudel. It is an effective penetrator due to its high hardness value combined with a very high density.
 
b) Tungsten carbide ammunition can be of the sabot type (a large arrow surrounded by a discarding push cylinder) or a subcaliber ammunition, where copper or other relatively soft material is used to encase the hard penetrating core, the two parts being separated only on impact. The latter is more common in small-caliber arms, while sabots are usually reserved for artillery use.
 
c) Tungsten carbide is also an effective neutron reflector and as such was used during early investigations into nuclear chain reactions, particularly for weapons. A criticality accident occurred at Los Alamos National Laboratory on 21 August 1945 when Harry K. Daghlian, Jr. accidentally dropped a tungsten carbide brick onto a plutonium sphere, causing the sub-critical mass to go critical with the reflected neutrons.
 
3) Sports
 
a) Hard carbides, especially tungsten carbide, are used by athletes, generally on poles which impact hard surfaces. Trekking poles, used by many hikers for balance and to reduce pressure on leg joints, generally use carbide tips in order to gain traction when placed on hard surfaces (like rock); such carbide tips last much longer than other types of tips.
 
b) While ski pole tips are generally not made of carbide, since they do not need to be especially hard even to break through layers of ice, rollerski tips usually are. Roller skiing emulates cross country skiing and is used by many skiers to train during warm weather months.
 
c) Sharpened carbide tipped spikes (known as studs) can be inserted into the drive tracks of snowmobiles. These studs enhance traction on icy surfaces. Longer v-shaped segments fit into grooved rods called wear rods under each snowmobile ski. The relatively sharp carbide edges enhance steering on harder icy surfaces. The carbide tips and segments reduce wear encountered when the snowmobile must cross roads and other abrasive surfaces.
 
d) Some tire manufacturers, such as Nokian and Schwalbe, offer bicycle tires with tungsten carbide studs for better traction on ice. These are generally preferred over steel studs because of their wear resistance.
 
4) Domestic
 
a) Tungsten carbide is sometimes used as the rotating ball in the tips of ballpoint pens to disperse ink during writing.
 
b) Tungsten carbide can now be found in the inventory of some jewelers, most notably as the primary material in men's wedding bands. When used in this application the bands appear with a lustrous dark hue often buffed to a mirror finish. The color is more similar to that of hematite than to that of platinum. The finish is highly resistant to scratches and scuffs, holding its mirror-like shine for years, although many jewelers are now able to inlay precious metals, woods, and other materials into tungsten carbide rings, which may not be as scratch-resistant as the tungsten carbide portions of the jewelry.
 
c) A common misconception held concerning tungsten carbide rings is they cannot be removed in the course of emergency medical treatment, requiring the finger to be removed instead. Emergency rooms and many full-service jewelry repair shops are equipped with jewelers' saws that can cut through tungsten carbide rings without injuring the hand or finger. An easier way to remove tungsten carbide rings is to use a tool such as vice grip style locking pliers.
 
d) Many manufacturers of this emerging jewelry material state that the use of a cobalt binder may cause unwanted reactions between the cobalt and the natural oils on human skin. Skin oils cause the cobalt to leach from the material. This is said to cause possible irritation of the skin and permanent staining of the jewelry itself. Many manufacturers now advertise that their jewelry is "cobalt free". This is achieved by replacing the cobalt with nickel as a binder. 
 
 
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What Are the Different Types of Tungsten Wire?

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 10:22
Tungsten wire can vary according to its size, use, and appearance. The most common application of this wire is for lighting lamps, because tungsten is very tolerant of heat. Halogen, fluorescent, and incandescent lights use the thinnest type, usually with a diameter of .001 inches (.0254 millimeters) to .1 inches (2.54 millimeters).
 
Pure tungsten wire can be classified as either a Type 1A or a Type 1B. Type 1A wire has non-sagging properties, typically used in hospital devices such as LEEP electrodes, thermionic emitters, and corona generation. The Type 1B can be used for products that use glass-to-metal seals, such as vacuum tubes, reed switches, and incandescent light bulbs; these wires are usually 99.95-percent pure and are excellent heat and electrical conductors. Wires of pure tungsten are usually more than .20 inches (5.08 millimeters) thick in diameter. They are so resistant to heat that some manufactured tungsten wires can have a melting point of about 6,150° Fahrenheit (3,400° Celsius).
 
Another type of tungsten wire is the doped wire. This means some elements have been added to somehow modify its strength and resistance. Doping also alters its chemical structure, and the wire will have an interlocking composition that makes it stronger. Three elements are commonly used in doping tungsten: potassium, aluminum, and silicon. This type of wire ranges from .001 inches (.0254 millimeters) to .250 inches (6.35 millimeters) in thickness and is used for wire and lamp filaments.
 
Another chemical called thoria can also be mixed in with tungsten to produce a specialized wire. Type 2A is the thoriated filament wire with just 1-percent of thoria, while the Type 2B has 2 percent. These wires can be manufactured into thread-like thinness and used for microwave ovens and plasma wielding. This type of tungsten wire is said to be 50 percent more effective as an electric conductor.
 
Tungsten wire can also be mixed in with another element called rhenium. Tungsten and rhenium can effectively create efficient metal alloys because both have very high melting points of 6,192°F (3,422°C) and 5,767°F (3,186°C), respectively. This type of wire is used for when very high heat is required, such as in thermocoupling. Tungsten-rhenium wires are categorized based on the percentage of rhenium included. WR30 has 3 percent rhenium, WR200 has 20 percent, while WR250 has 25 percent. All these types are highly resilient, strong, and resistant to corrosion.
 
 
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Tungsten Bank Fishing Sinkers

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 08:51

Tungsten bank fishing sinkers also known as reef sinkers resemble seeding leaves or egg fishing sinkers but the bank sinkers do not have a brass loop to hold the line. The bank reef fishing sinkers have a lead-mold eye, just like peduncle of seeding leaves.

These seeding leaves-shaped and tapered-shaped sinkers feature for hexagon sides other than smooth round surface, and the flat sides of the bank fishing sinkers contribute to preventing the sinkers from rolling in current and the tapered shape prevent the fishing sinkers from snagging in rocks.

Tungsten bank fishing sinkersare widely used in the past and of course it is commonly adopted by many anglers now as it works well and its bulbous shape prevents it from hanging up on the rocks.

Tungsten alloy is widely used to be the materials for fishing sinkers, contributing its environment friendly which the traditional material lead can not reach. What is more, it’s the good corrosion resistance property which makes the tungsten bank fishing sinkers more widely used.

Bank-fishing-sinkers


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Tungsten’s Military Applications

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Category: Tungsten Information
Published on Wednesday, 10 September 2014 08:47

Tungsten, in military applications, is used as a hardening agent to produce  armor penetrating rounds in bullets,. It is also used for fragmentation to create a devastating effect as its hardness remains intact as it shreds through targets. Tungsten is also used in cube and ball form in anti-personnel ordnance, ranging from grenades, to mines and rockets, these added tungsten cubes and balls are highly destructive due to their retention of their hard features, solid shapes as they impact. Tungsten alloys are also used in defensive plating, due to their hardness and strength. Tungsten carbide and other alloys are also used to make penetrators for weaponry, to enhance their effectiveness.

Another widely used application of tungsten in defense is the various weighting applications used in helicopters and other aircraft and armored vehicles. Helicopters use this tungsten to weight their rotors, noses, and skids. Tungsten alloys is widely used in these applications because of its hardness and size to weight ratio it is a perfect material for weighting and protection.

Companies around the world are also using tungsten in their production of military ammunitions, due to its environmentally friendly composition, as compared to lead, which has been proven in several ways to be increasingly destructive of the environment. Tungsten carbide, and other alloys have all been proven to be “clean” metals, which makes them an ideal choice internationally as we move towards grTungsten’s Military Applications
eener technologies.


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Properties Of Cemented Tungsten Carbide

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Category: Tungsten Information
Published on Tuesday, 09 September 2014 15:46
A cemented carbide is a composite material comprised of individual tungsten carbide grains imbedded in a ductile metal binder matrix of either cobalt or nickel. The physical and metallurgical properties of a particular “grade” of carbide are determined by its composition (its constituents and their relative amounts), the size distribution of the tungsten carbide grains after sintering, the binder metal type and content, the quality of the raw materials used, and the workmanship with which the material is made. Those most commonly measured to assess quality and define application areas are described below. The ASTM and/or ISO standard that applies to each of these measurements is also noted.
 
Density or specific gravity is the weight per unit volume of a cemented carbide measured in grams per cubic centimeter (g/cm3). It is essentially the weighted average of the densities of all of the components contained in the product and is therefore a check on its composition. For grades containing only tungsten carbide and a binder metal, the density of the composite decreases as the lighter binder metal content increases. 
 
Hardness is the resistance of a cemented carbide to penetration by a diamond indenter under a specific load. It is measured on the Rockwell A (Ra) scale in the US and on the Vickers (HV10 or HV30) scale in Europe and elsewhere. Hardness is primarily a function of composition and grain size with higher binder metal contents and coarser tungsten carbide grain sizes producing lower hardness values. Conversely, low binder contents and fine grain sizes produce high hardness values. Hardness is directly related to abrasive wear resistance. 
 
Transverse Rupture Strength (TRS) is a measure of the tensile strength of a cemented carbide in a three point bending test performed on standard rectangular bars. It is reported in units of pounds or thousands of pounds per square inch (psi or kpsi), or in Newtons per square millimeter (N/mm2). TRS is perhaps the best measure of the relative utility of individual production batches since it surveys a reasonable volume of material and will detect low levels of critical internal defects. Products having relatively high TRS values are generally applied where shock, impact, or failure by breakage are factors. 
 
Residual Porosity is determined by visually examining the polished surface of a sintered sample at 100X or 200X magnification. Ratings for “A” type porosity (pores less than 10 microns in diameter), “B” type porosity (pores larger than 10 microns in diameter), and “C” type porosity (carbon inclusions) are determined by comparing the size and frequencies of each pore type in the sample with those in standard photographs. Each standard photograph is associated with a numerical rating that is used to represent the porosity levels in the sample. In general, edge strength and toughness decrease as the level of residual porosity increases. At high levels of porosity, the wear resistance of the product may also be adversely affected. 
 
Magnetic Saturation is the degree to which the metal binder in a cemented carbide is saturated with carbon. It is most useful for materials having a cobalt binder. For a known cobalt content magnetic saturation values indicate how much carbon the cemented carbide contains – from unacceptably low values that indicate the presence of an undesirable carbon-deficient phase (known as eta phase) to unacceptably high values indicating the presence of free carbon (carbon “porosity”) in the product. Magnetic saturation is sometimes used as an indicator of relative strength among lots of a specific grade. 
 
Coercive Force is the strength of the magnetic field required to demagnetize a fully magnetized cemented carbide sample. Coercive force is typically measured in oersteds (Oe). The coercive force measurement depends on many factors including composition, sintered grain size distribution, residual porosity levels, and others. It is sometimes used as an alternative indication of hardness, but is best interpreted in combination with other properties as a measure of overall grade uniformity. 
 
 
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What Are the Different Tungsten Products?

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Category: Tungsten Information
Published on Tuesday, 09 September 2014 15:05
Tungsten products generally include everything from household items to aerospace technology. The metal is almost as dense as gold and has the highest melting point of any metal in purest form at 6,192°F (3,422°C). These properties popularize the use of tungsten in many applications. Tungsten has a wide range of industrial use when combined with other elements and industrial metals to make metal alloys or superalloys.
 
People use tungsten products daily without realizing it. Extreme heat resistance enables thin tungsten wire to be used as the filament in incandescent light bulbs, for example, and when combined with calcium and magnesium, it becomes fluorescent lighting. This quality also allows tungsten to be incorporated into the heating elements of heaters and furnaces. Artisans also might use tungsten oxide in ceramic and glassware glazes, producing a yellowish hue. Comparable to gold in hardness, the metal may substitute for gold or platinum in jewelry making, as tungsten is hypoallergenic and virtually scratch resistant.
 
Tungsten weights or powder might also be implemented to enhance the driving force in golf club heads. Tungsten combined with copper, iron or nickel may be used in making high-quality darts or for the strings of certain musical instruments. Commercial aircraft, race cars and yachts contain tungsten products, as the metal’s density provides counterweight, weight and stability.
 
Tungsten alloys are frequently incorporated into the turbines of aircraft engines as well. The metal is a constituent of various military items, as tungsten products are a part of the nozzles of projectile rockets and armor penetrating missiles. Cobalt, iron, nickel and tungsten also are the components used in cannon shells and grenades.
 
Tungsten inert gas, or TIG, welding uses a durable tungsten electrode to produce a stronger binding force when welding various metals. Tungsten or metal alloys may be cast from molds or particle sprayed to provide strength. Durable, long-lasting tungsten grinding wheels may be used in dentistry, metal or stone cutting and woodworking. When combined with steel or carbon, industries use tungsten products for construction, drilling and mining as well. Unaffected by oxygen, alkalis or most acids, the metal is commonly used as bearings, pistons, valve seats and other machine parts where friction, heat or corrosion are factors.
 
Medical tungsten products include the emitter coils in X-ray tubes and the shields used to protect personnel from radiation exposure. Calcium, magnesium and tungsten phosphorus convert X-rays into visible light for viewing. Tungsten is also typically used in liquid crystal displays and the manufacturing of microchips.
 
 
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What Is Tungsten?

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Category: Tungsten Information
Published on Tuesday, 09 September 2014 15:01
Tungsten is a metallic chemical element classified among the transition metals of the periodic table of elements. It is well known for its strength and durability, which make it extremely useful in a wide range of industrial applications. Some consumers also own products which contain tungsten or were produced with the metal. The world's major sources of this element are Russia, Austria, China, and Portugal, where it is extracted from minerals such as scheelite and wolframite.
 
This element is not found in a pure form in nature. When it is isolated, tungsten in a very hard, brittle, gray to white metal that is extremely corrosion resistant. It has the highest melting point and tensile strength of any metal, and it also has the lowest vapor pressure point. The metal is identified with the symbol W on the periodic table of elements, a reference to its alternate name, wolfram. Tungsten's atomic number is 74.
 
People have known about the existence of tungsten since at least the early 1700s, when observers noted that the metal interacted with tin. In 1784, the de Elhuyar brothers managed to isolate it in Spain, using tungstic acid extracted from wolframite. Tungsten has classically been a very valuable metal, since its durability and strength make it extremely useful for military and industrial uses. The name of the element comes from the Swedish tung, or “heavy,” and sten, for “stone.”
 
One of the most famous uses of tungsten is as a filament in light bulbs. The metal is also used in an assortment of alloys to increase their hardness and tensile strength. Many structural metal alloys use it since the metal has an extremely high melting point, and the element is also used to make wear-resistant tools. While these tools can be expensive, many workers like them because of their durability and long lifetimes.
 
Tungsten does have some safety precautions. Dust from the metal can be flammable or explosive, and it also irritates mucus membranes, such as those inside of the nose and mouth. In some regions, tungsten has been linked with serious infections of the lungs in people who work with the element on a regular basis without adequate protections. Exposure to the metal has also been correlated with increased rates of cancer, although hard evidence to turn the correlation into causation has not been uncovered.
 
 
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Stylish Tungsten Carbide Products

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Category: Tungsten Information
Published on Tuesday, 09 September 2014 14:32
Due to the special and durable quality of tungsten carbide, more and more manufacturers are engaged in tungsten carbide jewelry producing. Tungsten carbide is made into rings, pendant, watches, chains, bracelet, earrings, etc. 
 
1. Tungsten Carbide Rings
 
Tungsten rings are durable enough for casual wear, yet brilliant enough to be a representation of lifetime commitment. Blend their innovative new style with the look and feel of our traditional tungsten rings and you've got a two tone tungsten wedding band ring that is truly the best of both worlds! You can also find a variety of technology processing such as engrave, inlay, groove, etc. Ranging from solid style tungsten carbide rings to rings with precious metal inlays, all size are available, mens & womens, you will find the tungsten ring or tungsten carbide wedding ring in this section that perfectly represents you for a wedding, engagement, or casual style. Shop Followbest.com for Tungsten Rings
 
2. Tungsten Carbide Wedding Bands
 
Tungsten carbide wedding bands in our store are sure to instill commitment and integrity into your marriage. Their flawless features and virtually indestructible nature will create an everlasting bond between you and your partner. Select from a vast array of tungsten rings sure to match your look perfectly, whether its traditional classic styles or something more modern, all tungsten wedding bands are available in 6mm and 8mm sizes. Below you'll find a wide selection of women's & men's tungsten wedding rings and matching tungsten wedding band sets in all price ranges to choose from. Lifetime warranty, Lifetime sizing, Guaranteed for Life!
 
3. Tungsten Carbide Pendants
 
Tungsten Pendant in our store is good in quality and competitive in price. Each style is fashion and cute, you can also engrave names or date on it and we would manufacture Tungsten Pendant following your specific requirement. Tungsten carbide pendants offer refined style with strength and durability. Select a piece from our unique collection. 
 
4. Tungsten Carbide Bracelets
 
A tungsten carbide bracelet will turn heads. Its shine, luster and transparent colors make your tungsten bracelet the most unique accessory on the market. Tungsten carbide bracelets of our online store present a high gloss finish that lasts. The strength and durability of tungsten makes our tungsten bracelets nearly indestructible. Tungsten carbide bracelets are super heavy and practically scratch-proof yet will move comfortably and sit nicely on your wrist. 
 
Men want a bracelet that's as tough, strong and durable as they are, and with tungsten carbide that is exactly what they will get. Beauty and function rolled into one. Tungsten bracelets are great accessory for any occasion. 
 
5. Tungsten Carbide Watches
 
The high strength of the tungsten watch band makes our Tungsten Watches nearly indestructible. Every watch features tungsten carbide band and case. These tungsten watches even come with Swizz quartz movements and sapphire crystal lenses as well as well as an All Inclusive warranty and a stunning SL band box. The lens is a sapphire glass face and is highly scratch resistant. We have men's tungsten watches and womens tungsten watches to choose from. 
 
 
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