Special Metals NIMONIC® Alloy 81

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Special Metals NIMONIC® Alloy 81
Categories:	Metal; Nonferrous Metal; Nickel Alloy; Superalloy
Material Notes:	A precipitation-hardenable nickel-chromium alloy with enhanced resistance to high-temperature corrosion. The excellent hot-corrosion resistance of the alloy results from its high chromium content of 30%. The alloy also has good tensile and rupture strength and creep resistance at elevated temperatures. Used for gas turbines, piston-engine exhaust valves, and furnace equipment subject to attack by deposits resulting from combustion of impure fuels, particularly those containing alkali metal sulfates and chlorides. The standard product form is round. Data provided by the manufacturer, Special Metals.
Key Words:	Nickel-Chromium Alloy
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Physical Properties	Original Value	Comments

Density	8.06 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	830 MPa @Temperature 650 °C	Precipitation Hardened prior to test
	1050 MPa @Temperature 23.0 °C
Tensile Strength, Yield	600 MPa @Strain 0.2 %	Precipitation Hardened. Value at room temperature
	520 MPa @Strain 0.2 %, Temperature 650 °C	Precipitation Hardened prior to test
Elongation at Break	40 %	Precipitation Hardened
	30 % @Temperature 650 °C	Precipitation Hardened prior to test.

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.000127 ohm-cm
Magnetic Permeability	1.0004	at 200 Oersted (15.9 kA/m)

Thermal Properties	Original Value	Comments
CTE, linear	11.1 µm/m-°C @Temperature 20.0 - 100 °C
Specific Heat Capacity	0.461 J/g-°C
Thermal Conductivity	10.9 W/m-K
Melting Point	1305 - 1375 °C
Solidus	1305 °C
Liquidus	1375 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	0.90 %
Boron, B	0.0030 %
Carbon, C	<= 0.050 %
Chromium, Cr	<= 30 %
Cobalt, Co	<= 2.0 %
Copper, Cu	<= 0.20 %
Iron, Fe	<= 1.0 %
Manganese, Mn	<= 0.50 %
Molybdenum, Mo	<= 0.30 %
Nickel, Ni	63 %	As remainder
Silicon, Si	<= 0.50 %
Sulfur, S	<= 0.015 %
Titanium, Ti	1.8 %
Zirconium, Zr	0.060 %

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NINC62 / 17412

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