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href="http://www.chinatungsten.com/chinatungsten.htm" target="_blank">Chinatungsten Online »</a></li> <li class="nowmenu"><a href="http://www.chinatungsten.com/chinatungsten.htm" target="_blank">About Chinatungsten</a><br /> <a href="http://www.chinatungsten.com/about/contact.html" target="_blank">Contact Chinatungsten</a><br /> <a href="http://www.chinatungsten.com/about/visit.html" target="_blank">Visit Chinatungsten</a><br /> <a href="http://www.chinatungsten.com/Services.html" target="_blank">Chinatungsten Service</a><br /> <a href="http://www.chinatungsten.com/links.html" target="_blank">Websites Links</a></li> </ul> </div> </div> <div id="content"> <div class="breadcrumb">Your Position: <a href="http://www.chinatungsten.com" target="_blank">Home Page</a></div> <h1>What's Tungsten?</h1> <div class="bodytext"> <p><strong>Tungsten</strong> /tʌŋstən/, also known as wolfram /wʊlfrəm/, which is a chemical element with the symbol of W and atomic number 74. Tungsten Metal is a hard, rare metal, it was found naturally on the Earth only in chemical compounds such as tungsten oxide. Now, the most of tungsten mines was found in China.</p> <p><img src="http://www.chinatungsten.com/pic/Atomic%20Structure%20of%20tungsten.gif" alt="Atomic Structure of tungsten" title="Atomic Structure of tungsten" height="139" align="right" class="noborder" width="140" />Tungsten was identified as a new element in 1781, and it was the first isolated as a metal in 1783.There are two important tungsten ores include wolframite and scheelite.Tungsten has the highest melting point of all the non-alloyed metals and the 2nd highest melting point of all the elements after carbon. Also tungsten metal has high density of 19.3 g/cc which is comparable to that of uranium and gold, and it is much higher about 2 times than that of lead. </p> <p>Most of tungsten chemical compounds are Tungsten oxides and tungsten trioxides(WO3), tungsten oxides are always named tungsten intermediate products，they are tungstic acid, ammonium paratungstate (APT, tungsten oxide content 88.5% );ammonium metatungstate (AMT), sodium tungstate,yellow tungsten oxide (YTO),blue tungsten oxide (BTO), tungsten trioxide (WO3), violet tungsten oxide (VTO). The other tungsten chemical compounds are most often used industrially as tungsten catalysts, there are tungstic anhydride,pure tungsten oxide, extra pure tungsten oxide (refined tungsten oxide) yellow-green tungsten oxide, Tungstic acid anhydride (Wolframic acid anhydrous, Wolframic acid anhydride), puratronic tungsten(vi) oxide,etc.</p> <p>Tungsten metal it is also named pure tungsten, the unalloyed elemental form of tungsten is used mainly in electrical applications, for example, most notably in incandescent tungsten light bulb filaments, X-ray tubes (as both the tungsten filament and tungsten target), tungsten electrodes and also tungsten metal always used in tungsten steel. </p> <p> All tungsten sintered products are made by the method of powder metallurgy (PM), tungsten powder is the most important raw materials and the starting point for tungsten mill products. Tungsten powder is made from tungsten oxide and by roasting and heating in a hydrogen atmosphere. Purity, Oxygen, grain size are very important for tungsten powder. With mixing other element powder,Tungsten powder can be made into a variety of tungsten alloy. Another important application of the tungsten powder is made of tungsten carbide powder which is major materials of madding tungsten carbide sintered products. </p> <p>Tungsten metal has many different alloys which have numerous applications. Tungsten alloy always called super alloys, for the high density and nice TRS of tungsten alloy may used as military applications in penetrating projectiles, aircraft and helicopter jets' parts, aircraft and helicopter breaking plates and shoes, and our <strong>tungsten alloy</strong> swaged rod with perfect physical properties can be used for bullets of antitank missiles and canons' bullet, especially tungsten alloy cubes can be used for smart bomb (e.g. AHEAD); and other military applications. Also, tungsten alloy always used as tungsten alloy counterweight and tungsten alloy balance weight, the main application of tungsten alloys are as followings:</p> <table border="1" width="100%"> <tr> <td>Cell Phone</td> <td>Tungsten alloy mobile cubes</td> <td rowspan="14" width="140"><img src="http://www.chinatungsten.com/pic/Pictures-of-Tungsten.jpg" alt="tungsten properties" title="The properties of tungsten" height="151" width="140" /><img src="http://www.chinatungsten.com/pic/tungsten-elements.jpg" alt="tungsten elements" title="Tungsten Elements" height="166" width="140" /></td> </tr> <tr> <td>Watch</td> <td>Tungsten alloy watch bobs</td> </tr> <tr> <td>Computers</td> <td>Tungsten alloys heat sinks for PCB <br /> Tungsten alloy heat base for PCB </td> </tr> <tr> <td>Dart Sets</td> <td>Tungsten alloy dart billets, tungsten alloy dart barrels</td> </tr> <tr> <td>Golf</td> <td>Tungsten alloy golf clubs</td> </tr> <tr> <td>Yacht</td> <td>Tungsten alloy yacht balance,</td> </tr> <tr> <td>Fishing</td> <td>Tungsten alloy fishing sinkers</td> </tr> <tr> <td>Hunting Gun</td> <td>Tungsten alloy shots and hunting gun's bullets' balls</td> </tr> <tr> <td></td> <td>Tungsten alloy weights roller for meters,</td> </tr> <tr> <td rowspan="2">Racing Car & Motors</td> <td>Tungsten alloy balances for racing car</td> </tr> <tr> <td>Tungsten alloy crankshafts for motor & auto engines</td> </tr> <tr> <td>Home</td> <td>Tungsten alloy Paper Weight.</td> </tr> <tr> <td>Airplane</td> <td>Riveting bucking bars for airplanes,</td> </tr> <tr> <td>Submarines</td> <td>Tungsten alloy seals for submarine<br /> Tungsten alloy counterweigh , balance for submarine</td> </tr> </table> <p>The higher density tungsten heavy alloy has been used in medical instruments (e.g. X-ray machines, gamma-ray machines) as widely, the most important of tungsten alloy in medical is used as anti-radiation materials, such as tungsten alloy resource holder, tungsten alloy radiation shielding for uranium, depleted uranium (DU) protection shields. Tungsten alloy shielding for X-ray and gamma-ray, After the issue of the Japanese Uranium Powder Station,the newest tungsten alloy products for anti radiation are the materials of something as "Tungsten Plastic" for the application of tungsten protection coats of Uranium Powder Station.</p> <p><img class="noborder" src="http://www.chinatungsten.com/pic/WCP.jpg" alt="tungsten structure" title="The crystal structure of the tungsten" height="213" align="right" width="150" />Tungsten Putty is another new application for the application of weighting such as tungsten fishing sinker, racing car's weight, such as and tungsten putty for pinewood derby cars. Tungsten putty is a material made from tungsten powder and a polymer binder, the minimum density of tungsten putty is 10g/cm3.Tungsten Putty is non-hardening and easy to mold and shape to any form, so that you can have any design you want, and is easy to apply and will not dry out even after several weeks exposed to air and sunlight.</p> <p>The high hardness is another important property of tungsten metal. <strong>Tungsten carbide</strong> is the major usage of tungsten, tungsten carbide always called the teeth of modern industry. </p> <p>Tungsten carbide has another name as cemented carbide or tungsten cemented carbide, There are so many types of tungsten carbide, the most popular like tungsten carbide cutting tools, tungsten carbide drilling tools, tungsten carbide sealing and tungsten carbide milling tools, the main forms of tungsten carbide are tungsten carbide rods, tungsten carbide tips, tungsten carbide bar, tungsten carbide inserts, tungsten carbide plates, tungsten carbide seals, tungsten carbide buttons, tungsten carbide balls, tungsten carbide pellets and tungsten carbide dies.</p> <p> Tungsten copper (WCu) alloy is a pseudo-alloy of tungsten and copper, as they are not mutually soluble, the material is composed of distinct particles of one metal dispersed in a matrix of the other one. The microstructure of tungsten copper is therefore rather a metal matrix composite than a true alloy. Tungsten copper combines the properties of both metals that is heat-resistant, ablation-resistant, highly thermally and electrically conductive, and easy to machine. Then tungsten copper is used when it needs a high heat resistance, low thermal expansion and high electrical or thermal conductivity.<img class="noborder" src="http://www.chinatungsten.com/pic/DU Bullet Round.jpg" alt="tungsten bullet" title="Tungsten Bullet" height="180" align="right" width="150" /> Tungsten copper is used to make engines and electrical devices. Also, tungsten copper is used in aviation, electrodes, heat sinks, rocket parts and electrical contacts which is used to make contacts for both high and low voltage electrical devices. The manufacturing process of tungsten copper is to press and sinter tungsten or tungsten carbide at high temperature, infiltrate with copper and machine tungsten copper to expected forms. </p> <p>China Tungsten has been offering designing, manufacturing of pure tungsten, tungsten carbide and tungsten alloy products to more 1000 clients with ten thousands types tungsten products successfully from the year 1997. If you have any question and any demand of tungsten, please contact us without any hesitation, we promise you not offering only our qualified products but also the designing, prompt delivery, the most competitive prices and all solution. </p> </div> </div> <div id="main-right"> <div class="search"> <form action="http://www.chinatungsten.com/search.html" id="cse-search-box"> <input type="text" name="q" size="16" onBlur="if(this.value=='') this.value='Search in site';" onFocus="if(this.value=='Search in site') this.value='';" value="Search in site" style="font-size:12px; font-family: 'Times New Roman', Times, serif" /> <input type="submit" id="ss" value="" /> </form> </div> <div class="marquee"> <marquee onmouseover=this.stop() onmouseout=this.start() scrollAmount=1 scrollDelay=100 direction=up height="99%"> <p>Dear Visitors：<br /> Kindly resend your email or cc to <a href="mailto:sales@xiamentungsten.com" >sales@xiamentungsten.com</a> if emails back to you.<br /> Thank you for your 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