HD 18 tungsten alloy rod is particularly useful when magnetic permeability may be an issue. Its ingredient is 95% tungsten、3.5% nickel and 1.5% iron. It is Class 3 product of ASTM-B-777 tungsten alloy rod.
Although the introduction of copper results in lower tensile strength and ductility, the lack of magnetic properties make them an excellent choice for oncology systems, shielding electrical sensors in applications such as well logging, or rotating inertia members used near guidance systems.
The Properties of HD 18 tungsten alloy rod are:
Density: 18 Gms/cc and 0.65 Lbs/ in3
Hardness Rockwell: 27 C
Ultimate Tensile Strength: 115,000 PSI
Yield Strength(2% offset): 85,000 PSI
Elongation: 7 % in 1"
Proportional Elastic Limit: 45,000PSI
Modules of Elasticity: 45 x 106 PSI
Coefficient of Thermal Expansion: 4.4 X 10-6/°C (20~400°C)
Thermal Conductivity: 0.33 CGS Units
Electrical Conductivity: 16 % IACS
Magnetic Properties: NIL
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