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H.C. Starck NRC® 91 Tantalum - 7% Tungsten Alloy

Category Metal , Nonferrous Metal , Refractory Metal
Manufacturer H.C. Starck
Trade Name NRC®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF H.C. Starck NRC® 91 Tantalum - 7% Tungsten Alloy.pdf
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Material Notes:
Applications: NRC® 91 Metal wire products are primarily used for their superior tensile and yield strengths and torsion modulus. These properties are retained at high temperatures in vacuum. Further, this alloy has good dimensional stability even after repeated thermal cycles to 2400°F in vacuum. This alloy maintains tantalum's excellent corrosion resistance to halogens and acids. It is ideal for use in the manufacture of springs that are used in corrosive environments. This alloy is made by powder metallurgy.Forms Available: Wire between diameters 0.015 to 0.093".Corrosion Resistance: The chemical resistance properties of NRC® 91 Metal, like tantalum, are similar to those of glass. The alloy resists attack by almost all acids, except hydrofluoric, and has been successfully employed in severely corrosive environments. It is not attacked by chlorine or bromine gases.Information provided by H.C. Starck.
Physical Properties Metric English Comments
Specific Gravity 16.8 g/cc
16.8 g/cc
Mechanical Properties Metric English Comments
Hardness, Rockwell B 80 - 90
80 - 90
hardness as annealed
Tensile Strength 572 MPa

@Diameter 2.03 mm
83000 psi

@Diameter 0.0800 in
annealed
848 MPa

@Diameter 1.57 mm
123000 psi

@Diameter 0.0620 in
unannealed, drawn from annealed 0.080" wire
965 MPa

@Diameter 0.457 mm
140000 psi

@Diameter 0.0180 in
unannealed, drawn from annealed 0.080" wire
1030 MPa

@Diameter 1.14 mm
150000 psi

@Diameter 0.0450 in
unannealed, drawn from annealed 0.080" wire
1140 MPa

@Diameter 0.838 mm
165000 psi

@Diameter 0.0330 in
unannealed, drawn from annealed 0.080" wire
Elongation at Break 5.0 %

@Diameter 0.838 mm
5.0 %

@Diameter 0.0330 in
unannealed, drawn from annealed 0.080" wire
5.0 %

@Diameter 0.457 mm
5.0 %

@Diameter 0.0180 in
unannealed, drawn from annealed 0.080" wire
6.0 %

@Diameter 1.57 mm
6.0 %

@Diameter 0.0620 in
unannealed, drawn from annealed 0.080" wire
6.0 %

@Diameter 1.14 mm
6.0 %

@Diameter 0.0450 in
unannealed, drawn from annealed 0.080" wire
26 %

@Diameter 2.03 mm
26 %

@Diameter 0.0800 in
annealed
Modulus of Elasticity 186 GPa
27000 ksi
Modulus of Rigidity 71.0 GPa
10300 ksi
Poissons Ratio 0.31
0.31
Calculated
Thermal Properties Metric English Comments
Melting Point 3025 °C
5477 °F
Component Elements Properties Metric English Comments
Carbon, C <= 0.010 %
<= 0.010 %
Hydrogen, H <= 0.0010 %
<= 0.0010 %
Iron, Fe <= 0.010 %
<= 0.010 %
Molybdenum, Mo <= 0.050 %
<= 0.050 %
Nickel, Ni <= 0.0050 %
<= 0.0050 %
Niobium, Nb (Columbium, Cb) <= 0.10 %
<= 0.10 %
Nitrogen, N <= 0.010 %
<= 0.010 %
Oxygen, O <= 0.025 %
<= 0.025 %
Silicon, Si <= 0.015 %
<= 0.015 %
Tantalum, Ta >= 91.769 %
>= 91.769 %
Balance
Titanium, Ti <= 0.0050 %
<= 0.0050 %
Tungsten, W 6.5 - 8.0 %
6.5 - 8.0 %
Electrical Properties Metric English Comments
Volume Resistivity 0.0000188 ohm-cm

@Temperature 0.000 - 100 °C
0.0000188 ohm-cm

@Temperature 32.0 - 212 °F
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