Tungsten Machining Service

Tungsten machining products have the highest melting point and lowest vapor pressure of all the refectory metals products. The main methods used to machine tungsten materials are forming, grinding and joining.

 

Forming

Ductile to brittle transition temperature (DBTT) and recrystallization temperature are the two major factors that affect the forming process of tungsten materials. All of the forming such as bending, punching, forging, spinning and cutting must occur somewhere between these two ranges of temperatures. Tungsten becomes progressively brittle as the DBTI drops and more ductile as the recrystallization temperature rises. DBTI of tungsten materials is 200 – 500°C. Recrystallization temperature is 856 – 1200 °C. These temperature ranges are the upper and lower limits of the forming temperature.

 

Grinding

The best working range of temperatures to machine tungsten and tungsten alloys is from 343 to 371°C. The copper and silver doped tungsten alloy and tungsten heavy alloy can be machined under room temperature. The tungsten materials with a relative density of 93% are the hardest to be machined. Therefore, the SiC or AL2O3 low-speed grinding is the typical method utilized to machine the materials. The tungsten materials with a relative density lower than 93% are comparatively easier to grind and cut by using wheels with high hardness (K or L) or ruby wheels.

 

Joining

Joining is an integrated process including one or diverse methods, such as riveting, induction welding, resistance welding, soldering and chemical vapor deposition.

Tungsten Materials and Components

The common forms of Tungsten and tungsten alloy products such as plate, sheet, strip, foil, rod, wire are isostatically pressed and sintered from the powders to compact billet by powder metallurgy. Following the powder metallurgy is a series of further deformations and heat treatments until the required products are finished. After the production process, the tungsten products might need to be ground, polished, or cleaned based upon the surface condition requested by the customer. CONTACT US and download our PRODUCT CATALOG to learn more about our Tungsten products.

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/°F x 10-6
2.40 micro-in/°C x 10-6
Hardness300 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

Tungsten is one of the most common materials utilized in high tech industries, such as military, aerospace, nuclear energy, vessel, electronic and chemical industries. Tungsten can be used to produce cutting tools, gas-turbine blades, thermal tubes, electronic contacts and radiation shields, high temperature furnace parts, etc. Tungsten material products usually contain a small percentage of other metals to improve or diversify its valuable properties. Those composite metals and materials 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

As an ISO certified tungsten manufacturer, CHEMETAL USA is capable of offering various types of tungsten products that all meet a consistently high standard that conforms to ASTM B-760. We have the capacity to provide a fast lead time and handle large-volume contracts.

CHEMETAL USA is a recognized manufacturer and supplier of tungsten machining products. Every tungsten machining product we supply is under stringent quality control. Thanks to our experience and capacity in the field of machining tungsten materials, we can always guarantee that our customers receive high-performance tungsten products, which has exceptional purity, strength, dimension, flatness and surface condition. Our knowledgeable engineers work closely with our customers to tailor the product’s parameters to the customer’s requirements.

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