Materion ULTRA 76 Plus Tantalum Alloy

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Materion ULTRA 76 Plus Tantalum Alloy
Categories:	Metal; Nonferrous Metal; Refractory Metal
Material Notes:	ULTRA 76 Plus tantalum alloy (Ta-2.5%W-0.15Ru) offers higher strength and superior corrosion resistance compared to standard NRC® 76 (Ta-2.5%W). ULTRA 76 Plus provides minimized hydrogen embrittlement rates – up to 100 times lower in hydrochloric acid, and up to 10 times lower in sulfuric acid. It therefore eliminates the need for a separate “platinum spot welding” application step to protect against hydrogen embrittlement. With comparable properties to those of conventional tantalum alloys, ULTRA 76 Plus can be easily adopted to the same processing and fabrication techniques. Benefits Improved corrosion resistance Minimized hydrogen embrittlement rates High strength Longer equipment life Ability to stand up to increased operating temperatures Less operating downtime Applications Bayonet heaters - single and multi-tube types Heat exchangers, condensers and coils Thermocouple protection sheaths Pumps, bodies or cases, shafts and impellers Paddle stirrers and agitators Distillation columns and boilers Tantalum clad dip pipes, heaters and chemical plant equipment Crucibles in standard and special shapes and sizes Information provided by Materion.
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Physical Properties	Original Value	Comments

Density	0.602 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	50.0 - 80.0	Annealed
Hardness, Vickers	115 - 160	Annealed
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
Tensile Strength, Yield	35.0 - 45.0 ksi	Typical
	25.5 ksi @Strain 0.200 %, Temperature 249 °C
	27.4 ksi @Strain 0.200 %, Temperature 199 °C
	30.5 ksi @Strain 0.200 %, Temperature 98.9 °C
	35.5 ksi @Strain 0.200 %, Temperature 21.1 °C
Elongation at Break	10.0 % @Temperature 199 °C
	10.0 % @Temperature 249 °C
	15.0 % @Temperature 98.9 °C
	20.0 % @Temperature 21.1 °C
Modulus of Elasticity	27000 ksi

Thermal Properties	Original Value	Comments
CTE, linear	>= 3.60 µin/in-°F @Temperature 20.0 - 500 °C
Specific Heat Capacity	0.141 J/g-°C @Temperature >=100 °C
Thermal Conductivity	0.0581 W/m-K @Temperature 20.0 - 100 °C
Melting Point	2996 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.00500 %	<50 ppm
Hydrogen, H	<= 0.00100 %	<10 ppm
Iron, Fe	<= 0.00500 %	<50 ppm
Molybdenum, Mo	<= 0.0200 %	<200 ppm
Nickel, Ni	<= 0.00500 %	<50 ppm
Niobium, Nb (Columbium, Cb)	0.100 %
Nitrogen, N	<= 0.00500 %	<50 ppm
Other	0.100 - 0.200 %	1000 - 2000 ppm Platinum Group Metals
Oxygen, O	<= 0.0100 %	<100 ppm
Silicon, Si	<= 0.00250 %	<25 ppm
Tantalum, Ta	96.4 - 97.9 %	As Balance
Titanium, Ti	<= 0.00400 %	<40 ppm
Tungsten, W	2.00 - 3.50 %

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NBB92260 / 323618

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