High-Density Tungsten Alloys for Aerospace Applications

H.C. Starck manufactures refractory metals and fabricated products, and offers high performance solutions to companies serving in the aviation industry. Refractory metals such as tungsten alloys are suitable for making machined and fabricated products in key aerospace applications.

H.C. Starck supplies machineable high-density tungsten alloys with a density over 60% more than lead, thus facilitating stabilization of helicopter rotor blades and the control surfaces of rudder sections, elevators and ailerons. The tungsten balance weight alloys provided by H.C. Starck are manufactured and accredited to ASTM B777, AMS 7725, and AMS-T-21024.

Rigorous Process Controls at H.C. Starck

H.C. Starck in close cooperation with customers in the aviation market develops and manufactures customized products to meet specific customer requirements. With more than three decades of experience in producing high performance materials for a myriad of applications, the company continually supplies superior quality materials and products.

With more than three decades of experience in producing high performance materials for a myriad of applications, the company continually supplies superior quality materials and products.

As a vertically integrated manufacturer, H.C. Starck carefully controls all its processes, starting from refining the raw materials all the way through to delivering high purity finished products. With a unique global reach, the company closely contacts and collaborates with its customers.

The company’s knowledgeable research and development department enables it to achieve technological developments and design new products in close cooperation with its partners in the industry. The following

High-Density Tungsten Alloys from H.C. Starck

The following table lists the nominal properties of different tungsten alloys offered by H.C. Starck:

Alloy Designation K1700 K1701 K1750 K1800 K1801 K1850
Tungsten content (%) 90 90 92.5 95 95 97
Density (g/cm3) 17 17 17.5 18 18 18.5
  (lb/in3) 0.61 0.61 0.63 0.65 0.65 0.67
Hardness (Rc) 23 22 24 25 24 26
Ultimate Tensile Strength (psi) 125,000 110,000 125,000 125,000 110,000 120,000
  (N/mm2) 860 760 860 860 760 830
Yield Strength (psi) 85,000 80,000 90,000 90,000 85,000 95,000
  (N/mm2) 590 550 620 620 590 660
Elongation (% in 1 inch) 12 4 10 8 2 6
Modulus of Elasticity (psi x 106) 45 40 46 48 45 50
  (kN/mm2) 310 280 320 330 310 345
Magnetic Properties   slight none slight slight none slight
Magnetic Permeability (μ) >1.05 <1.05 >1.05 >1.05 <1.05 >1.05
Thermal Expansion Coefficient (Xl0-6/°C)(20 °C-500 °C) 5.1 5.4 4.9 4.8 5.0 4.8
Thermal Conductivity (cgs) 0.20 0.23 0.24 0.27 0.32 0.26
Electrical Conductivity (% IACS) 11 14 12 15 16 16
MIL-T-21014(D) class 1 1 2 3 3 4
ASTMB777 class 1 1 2 3 3 4

The high-density tungsten alloys manufactured by H.C. Starck have found use in the following aerospace applications:

  • Vibration dampening
  • Instrumentation balance weights
  • Aircraft and helicopter balance weights


H.C. Starck provides a range of high performance materials and alloys, including tungsten, niobium, tantalum and nickel based alloys, and molybdenum, to variety of market such as medical, automotive, energy, electronics, chemical processing, aerospace and defense.

H.C. Starck Fabricated Products

This information has been sourced, reviewed and adapted from materials provided by H.C. Starck Solutions.

For more information on this source, please visit H.C. Starck Solutions.


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