Tungsten (atomic symbol “W”) is a rare and extremely versatile metal element whose unique properties are ideal for a wide range of industrial uses.

Tungsten is found naturally on Earth almost entirely in compounds with other elements. When separated and purified, tungsten has:

  • The highest melting point of all known elements except carbon (3,410 °C; 6,170 °F; 3,683 K).
  • The highest boiling point (5,930 °C; 10,706 °F; 6,203 K).
  • A density of 19.30 grams per cubic centimeter (0.697 lb/cu in)—nearly double that of lead, and comparable to uranium and gold.

Tungsten Products

CHEMETAL USA offers a huge number of tungsten products in large volumes and at fast lead times that consistently meet the high standards of ASTM B-760. We manufacture and supply tungsten materials, components, and machined products worldwide, under stringent quality control protocols. The result is a wide array of products of exceptional purity, strength, dimension, flatness, and surface condition. Our engineers have decades of knowledge and experience, and they are eager to share them with our customers to tailor every order to exact specifications. CONTACT US and download our PRODUCT CATALOG to learn more about our Tungsten products.

Tungsten Powder Metallurgy

CHEMETAL USA is a world leader in the complex science of powder metallurgy (PM). Among the most important processes in PM is sintering—the application of very high heat and pressure to pure powder forms of tungsten and various alloys until they combine at the molecular level.

 

Temperature is critical in sintering because the metal/s do not actually melt into liquid form. Rather, their atoms diffuse across particle boundaries and fuse together. The resulting sintered billets of pure or alloyed tungsten are further hot rolled, forged, and heat treated into plates; sheets; strips; foil; rods; and wire. These may require additional grinding, polishing, or cleaning based on surface conditions specified by our customers.

 

Great expertise, experience, and exceptional quality control is required at every step. Nevertheless, the use of pure powders is highly cost-efficient; it can reduce or eliminate the need to use metal removal processes, thereby increasing yields and lowering costs.

Tungsten Physical And Mechanical Properties

Tungsten Physical Properties

Tungsten Mechanical Properties

Density0.70 lb/in3
19.27 gm/cm3
Tensile Strength250 (1725) ksi (Mpa)-RT
Melting Point6170 °F
3410 °C
150 (1035) ksi (Mpa)-500°C
Thermal Conductivity0.48 cal/cm2/cm°C/sec75 (515) ksi (Mpa)-1000°C
Specific Heat0.032 cal/gm/°CElongation
Coefficient Thermal Expansion4.30 micro-in/°C x 10-6Hardness300 dph
Electrical Resistivity5.50 microohm-cmModules of Elasticity58000 ksi
400 gpa

Tungsten Properties

  • High Density: 19.25 g/cm³
  • High Melting Point: 3422°C (6192 °F)
  • Low Vapor Pressure
  • High Tensile Strength
  • Low Coefficient of Thermal Expansion
  • Low Electrical Resistivity
  • Good Machinability
  • High Absorption Capacity
  • High Elastic Modulus

Tungsten Applications

Despite its rarity, tungsten is among the most used materials in high-tech industries, including military; aerospace; nuclear energy; electronics; and chemical. Tungsten can be used to produce cutting tools; gas-turbine blades; thermal tubes; electronic contacts and radiation shields; and high temperature furnace parts, among many others. Such products usually contain a small percentage of other metals to amplify or augment its essential properties. These alloying metal and non-metal elements include molybdenum; titanium; tantalum; carbon; copper; nickel; and zirconium, to name a few.

 

Cemented Tungsten Carbide

Cemented tungsten carbide is an extensively used cutting material which contains very fine carbonized tungsten particles. The production of tungsten carbide and tungsten iron consume the largest amount of tungsten materials. In addition, tungsten heavy alloy is another widely used tungsten composite material which contains 90 to 97 percentage of tungsten and other alloyed metals such as nickel, iron and copper in balance. Tungsten heavy alloy is an excellent material for producing hardened components that need to be high density, radiation-absorbent and wear-resistant, such as balance weights, radiation shield, anvil block, etc.

 

Heating Elements And Shields

Heating elements and shields in furnaces which are machined from tungsten rod, sheet or wire can retain these excellent properties. Additionally, tungsten furnace parts can maintain a high level of chemical stability, corrosion resistance and strength throughout a long service life. Thus, tungsten assemblies and parts are an ideal choice for users of various high temperature furnaces including hot isostatic pressing (HIP) furnace, crystal growth furnace, sintering furnace, vacuum furnace. Moreover, machining tungsten metal and alloys have been used extensively to produce furnace parts due to its very high melting point and low vapor pressure.

 

Sputtering Targets And Vapor Evaporation

The high chemical purity and homogeneity of machining tungsten make it an ideal material to use as sputtering targets and vapor evaporation. Moreover, the ability of high density to absorb radiation and resist corrosion is invaluable when tungsten product is utilized as a radiation shielding material. Therefore, tungsten products are irreplaceable in a wide range of industries and applications including quartz glass, health care, coating processes, thermal processes and ion implantation.

Tungsten can also be combined with tantalum, niobium or molybdenum to produce a refractory metal which is capable of bearing a 1300 °C  and higher temperature. Furthermore, tungsten copper material boasts high electrical and thermal conductivity and consequently is desirable to use as arcing contact, vacuum contacts, heat sinks and electrodes in a high temperature environment.

  • Furnace Components
  • Semiconductor Base Plates
  • Ion Implantation Cathodes And Anodes
  • Sintering And Annealing Boats And Charge Carriers
  • Radiation Shielding, Sputtering Targets and Electrodes
  • Components for Electron Tubes