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H.C. Starck Ultra 76 Alloy (Ta 2.5%W)

Category Metal , Nonferrous Metal , Refractory Metal
Manufacturer H.C. Starck
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF H.C. Starck Ultra 76 Alloy (Ta 2.5%W).pdf
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Material Notes:
Benefits: Significantly improved corrosion resistance in HCl and H2SO4 acids.Minimized hydrogen embrittlement rates compared to standard NRC®76Up to 100 times lower in HCl acidUp to 10 times lower in H2SO4 acidEliminates the need for a separate Pt application step to protect against H embrittlement.Maintains all the excellent mechanical properties of NRC®76.Potential for increased operating temperatures in both HCl and H2SO4.Applications: High strength alloy for corrosion applications in heat transfer equipment, vessels, piping, etc., and all applications where tantalum's physical properties are desired at a higher strength level than pure tantalum, and better corrosion resistance in HCl and H2SO4 acids.Forms Available: Foil, Sheet, Welded Tubing, Rod, Plate, Wire and Bar.Metallurgical Characteristics: Material is single-phase tantalum with tungsten and platinum group metals in solid solution, stress relieved material at 2000°F, re-crystallized material at 2400°F.Information provided by H.C. Starck.
Physical Properties Metric English Comments
Density 16.7 g/cc
0.602 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 50 - 80
50 - 80
hardness as annealed, typical
Hardness, Vickers 115 - 160
115 - 160
hardness as annealed, typical
Tensile Strength >= 276 MPa

@Temperature 249 °C
 >= 40000 psi

@Temperature 480 °F
>= 290 MPa

@Temperature 199 °C
 >= 42000 psi

@Temperature 390 °F
>= 331 MPa

@Temperature 98.9 °C
 >= 48000 psi

@Temperature 210 °F
>= 345 MPa

@Temperature 21.1 °C
 >= 50000 psi

@Temperature 70.0 °F
Tensile Strength, Ultimate 310 - 379 MPa

@Temperature 20.0 °C
 45000 - 55000 psi

@Temperature 68.0 °F
Tensile Strength, Yield 241 - 310 MPa

@Temperature 20.0 °C
 35000 - 45000 psi

@Temperature 68.0 °F
 typical
>= 176 MPa

@Strain 0.200 %,
Temperature 249 °C
 >= 25500 psi

@Strain 0.200 %,
Temperature 480 °F
>= 189 MPa

@Strain 0.200 %,
Temperature 199 °C
 >= 27400 psi

@Strain 0.200 %,
Temperature 390 °F
>= 210 MPa

@Strain 0.200 %,
Temperature 98.9 °C
 >= 30500 psi

@Strain 0.200 %,
Temperature 210 °F
>= 245 MPa

@Strain 0.200 %,
Temperature 21.1 °C
 >= 35500 psi

@Strain 0.200 %,
Temperature 70.0 °F
Elongation at Break >= 10 %

@Temperature 199 °C
 >= 10 %

@Temperature 390 °F
>= 10 %

@Temperature 249 °C
 >= 10 %

@Temperature 480 °F
>= 15 %

@Temperature 98.9 °C
 >= 15 %

@Temperature 210 °F
>= 20 %

@Temperature 21.1 °C
 >= 20 %

@Temperature 70.0 °F
Modulus of Elasticity 186 GPa
27000 ksi
Thermal Properties Metric English Comments
CTE, linear 6.48 µm/m-°C

@Temperature 20.0 - 500 °C
 3.60 µin/in-°F

@Temperature 68.0 - 932 °F
Specific Heat Capacity 0.141 J/g-°C

@Temperature 100 °C
 0.0336 BTU/lb-°F

@Temperature 212 °F
Thermal Conductivity 55.3 W/m-K

@Temperature 20.0 - 100 °C
 384 BTU-in/hr-ft²-°F

@Temperature 68.0 - 212 °F
Melting Point 2996 °C
5425 °F
Component Elements Properties Metric English Comments
Carbon, C <= 0.0050 %
<= 0.0050 %
Hydrogen, H <= 0.0010 %
<= 0.0010 %
Iron, Fe <= 0.0050 %
<= 0.0050 %
Molybdenum, Mo <= 0.020 %
<= 0.020 %
Nickel, Ni <= 0.0050 %
<= 0.0050 %
Niobium, Nb (Columbium, Cb) >= 0.10 %
>= 0.10 %
Nitrogen, N <= 0.0050 %
<= 0.0050 %
Oxygen, O <= 0.010 %
<= 0.010 %
Platinum, Pt 0.10 - 0.20 %
0.10 - 0.20 %
Platinum Group Metals
Silicon, Si <= 0.0025 %
<= 0.0025 %
Tantalum, Ta >= 96.14 %
>= 96.14 %
Balance
Titanium, Ti <= 0.0040 %
<= 0.0040 %
Tungsten, W 2.0 - 3.5 %
2.0 - 3.5 %
% wt
Electrical Properties Metric English Comments
Volume Resistivity 0.0000147 ohm-cm

@Temperature 0.000 - 100 °C
 0.0000147 ohm-cm

@Temperature 32.0 - 212 °F
Chemical Properties Metric English Comments
Thermal Neutron Cross Section 21.3 barns/atom
21.3 barns/atom
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