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

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H.C. Starck Ultra 76 Alloy (Ta 2.5%W)
Categories:	Metal; Nonferrous Metal; Refractory Metal
Material Notes:	Benefits: Significantly improved corrosion resistance in HCl and H₂SO₄ acids. Minimized hydrogen embrittlement rates compared to standard NRC®76 Up to 100 times lower in HCl acid Up to 10 times lower in H₂SO₄ acid Eliminates 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.
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Physical Properties	Original Value	Comments

Density	0.602 lb/in³

Chemical Properties	Original Value	Comments
Thermal Neutron Cross Section	21.3 barns/atom

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	50 - 80	hardness as annealed, typical
Hardness, Vickers	115 - 160	hardness as annealed, typical
Tensile Strength	>= 40.0 ksi @Temperature 249 °C
	>= 42.0 ksi @Temperature 199 °C
	>= 48.0 ksi @Temperature 98.9 °C
	>= 50.0 ksi @Temperature 21.1 °C
Tensile Strength, Ultimate	45.0 - 55.0 ksi @Temperature 20.0 °C
Tensile Strength, Yield	35.0 - 45.0 ksi @Temperature 20.0 °C	typical
	>= 25.5 ksi @Strain 0.2 %, Temperature 249 °C
	>= 27.4 ksi @Strain 0.2 %, Temperature 199 °C
	>= 30.5 ksi @Strain 0.2 %, Temperature 98.9 °C
	>= 35.5 ksi @Strain 0.2 %, Temperature 21.1 °C
Elongation at Break	>= 10 % @Temperature 199 °C
	>= 10 % @Temperature 249 °C
	>= 15 % @Temperature 98.9 °C
	>= 20 % @Temperature 21.1 °C
Modulus of Elasticity	27000 ksi

Electrical Properties	Original Value	Comments
Volume Resistivity	0.0000147 ohm-cm @Temperature 0.000 - 100 °C

Thermal Properties	Original Value	Comments
CTE, linear	3.60 µin/in-°F @Temperature 20.0 - 500 °C
Specific Heat Capacity	0.0336 BTU/lb-°F @Temperature 100 °C
Thermal Conductivity	384 BTU-in/hr-ft²-°F @Temperature 20.0 - 100 °C
Melting Point	2996 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.0050 %
Hydrogen, H	<= 0.0010 %
Iron, Fe	<= 0.0050 %
Molybdenum, Mo	<= 0.020 %
Nickel, Ni	<= 0.0050 %
Niobium, Nb (Columbium, Cb)	>= 0.10 %
Nitrogen, N	<= 0.0050 %
Oxygen, O	<= 0.010 %
Platinum, Pt	0.10 - 0.20 %	Platinum Group Metals
Silicon, Si	<= 0.0025 %
Tantalum, Ta	>= 96.14 %	Balance
Titanium, Ti	<= 0.0040 %
Tungsten, W	2.0 - 3.5 %	% wt

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NHCST928 / 130818

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