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Tungsten Heavy Metal Boring Bar

Tungsten Heavy Metal Boring Bar

Description
Tungsten heavy metal boring bars, also known as tungsten boring bars, tungsten chatter free boring bars, are manufactured in sintered or polished alloys of 90%-95% tungsten. These alloys are very similar to tungsten-carbides but the chemical composition is developed differently to reduce embrittlement. The high density (twice as heavy as steel) and tensile strength (110 kpsi) of this alloy makes the ideal combination for chatter free tools and supper chatter free tools.

Application
Tungsten heavy metal boring bars greatly enhance boring application by absorbing vibration and drastically reduce chatter, enabling to machine deeper bores with greater precision and finish.
We also offer tungsten heavy metal tool holder with tungsten content over 90%. It is widely used for boring bars, grinding mandrels, tool shafts and all types of precision tool that require vibration-damping to ensure smooth running.

Performance of Tungsten Heavy Metal Boring Bar

 Tungsten Heavy Metal Grade Chart
MIL-T-21014 Rev D Class 1 Class 2 Class 3 Class 4 Class 1 Class 2 Class 3
SAE-AMS-T-21014 Class 1 Class 2 Class 3 Class 4 Class 1 Class 2 Class 3
ASTM B777-07 Class 1 Class 2 Class 3 Class 4 Class 1 Class 2 Class 3
AMS 7725 C 7725 C       7725 C    
Matrix (wt. %) 90.0% W 92.5% W 95.0% W 97.0% W 90.0% W 92.5% W 95.0% W
Binder (wt. %) 10.0% Ni-Fe 7.5% Ni-Fe 5.0% Ni-Fe 3.0% Ni-Fe 10.0% Ni-Cu 7.5% Ni-Fe 5.0% Ni-Cu
Nominal Density (g/cm3) 16.85-17.25 17.15-17.85 17.75-18.35 18.25-18.85 16.85-17.25 17.15-17.85 17.75-18.35
Nominal Density (lb/in3) 0.614 0.632 0.650 0.668 0.614 0.632 0.650
Typical Hardness (Rc) 26 26 28 30 26 26 28
Ultimate Tensile Strength - Min. (psi) 110,000 110,000 105,000 100,000 94,000 110,000 94,000
0.2% Offset Yield Strength - Min. (psi) 75,000 75,000 75,000 75,000 75,000 75,000 75,000
Magnetic Characteristics Slightly magnetic Slightly magnetic Slightly magnetic Slightly magnetic Nonmagnetic Nonmagnetic Nonmagnetic

Package and Transportation
We pack tungsten heavy metal boring bars in plywood case and send them by ocean or air.

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