Special Metals NIMONIC® alloy 91 Ni-Cr-Co Alloy

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Special Metals NIMONIC® alloy 91 Ni-Cr-Co Alloy
Categories:	Metal; Nonferrous Metal; Cobalt Alloy; Nickel Alloy
Material Notes:	NIMONIC® alloy 91 is a wrought nickel-chromium-cobalt based alloy strengthened by additions of aluminum and titanium. This alloy is a modification of NIMONIC alloy 90, but has an increased chromium content to improve corrosion resistance in salt and sulfur contaminated environments. The alloy is suitable for long service up to about 900°C. It combines good strength and ductility with stability of microstructure and excellent resistance to hot corrosion. NIMONIC alloy 91 is intended for high-temperature stressed parts such as blades in gas turbines, burning impure fuels or operating in marine environments. Information Provided by Special Metals Corporation
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Physical Properties	Original Value	Comments

Density	8.08 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	96.0 MPa @Temperature 1000 °C
	365 MPa @Temperature 900 °C
	644 MPa @Temperature 800 °C
	947 MPa @Temperature 700 °C
	993 MPa @Temperature 600 °C
	1001 MPa @Temperature 400 °C
	1126 MPa @Temperature 200 °C
	1180 MPa @Temperature 20.0 °C
Tensile Strength, Yield	59.0 MPa @Strain 0.1 %, Temperature 1000 °C
	61.0 MPa @Strain 0.2 %, Temperature 1000 °C
	293 MPa @Strain 0.1 %, Temperature 900 °C
	315 MPa @Strain 0.2 %, Temperature 900 °C
	530 MPa @Strain 0.1 %, Temperature 600 °C
	533 MPa @Strain 0.1 %, Temperature 400 °C
	535 MPa @Strain 0.1 %, Temperature 800 °C
	544 MPa @Strain 0.2 %, Temperature 400 °C
	547 MPa @Strain 0.2 %, Temperature 600 °C
	556 MPa @Strain 0.2 %, Temperature 800 °C
	561 MPa @Strain 0.1 %, Temperature 700 °C
	581 MPa @Strain 0.2 %, Temperature 700 °C
	599 MPa @Strain 0.1 %, Temperature 200 °C
	610 MPa @Strain 0.2 %, Temperature 200 °C
	657 MPa @Strain 0.1 %, Temperature 20.0 °C
	663 MPa @Strain 0.2 %, Temperature 20.0 °C
Elongation at Break	21.6 % @Temperature 600 °C
	22.4 % @Temperature 900 °C
	25.6 % @Temperature 800 °C
	28 % @Temperature 700 °C
	28 % @Temperature 400 °C
	29.6 % @Temperature 200 °C
	31.2 % @Temperature 20.0 °C
	137.8 % @Temperature 1000 °C
Reduction of Area	23.5 % @Temperature 600 °C
	24.2 % @Temperature 900 °C
	24.9 % @Temperature 800 °C
	26.6 % @Temperature 400 °C
	27.9 % @Temperature 700 °C
	29.3 % @Temperature 20.0 °C
	31.5 % @Temperature 200 °C
	98 % @Temperature 1000 °C
Rupture Strength	139 MPa @Temperature 870 °C, Time 533000 sec	cold-rolled; 12.8% elongation
	250 MPa @Temperature 815 °C, Time 338000 sec	forged; 8.4% elong
	386 MPa @Temperature 750 °C, Time 266000 sec	forged; 4.4% elong
Modulus of Elasticity	132 GPa @Temperature 900 °C
	149 GPa @Temperature 700 °C
	163 GPa @Temperature 500 °C
	195 GPa @Temperature 300 °C
	204 GPa @Temperature 100 °C
	222 GPa @Temperature 20.0 °C
Impact Test	16.3 J @Temperature 750 °C, Time 7.27e+6 sec	Soaking Time: 2020 hours at 750°C
	32.5 - 38.0 J @Treatment Temp. 850 °C, Time 3.60e+6 sec	Soaking Time: 1000 hours at 850°C

Thermal Properties	Original Value	Comments
Specific Heat Capacity	0.447 J/g-°C @Temperature 20.0 °C
	0.468 J/g-°C @Temperature 100 °C
	0.521 J/g-°C @Temperature 300 °C
	0.574 J/g-°C @Temperature 500 °C
	0.627 J/g-°C @Temperature 700 °C
	0.680 J/g-°C @Temperature 900 °C
Melting Point	>= 1300 °C
	1350 °C
Solidus	1300 °C
Liquidus	1350 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	0.90 - 1.5 %
Boron, B	0.0020 - 0.010 %
Carbon, C	<= 0.10 %
Chromium, Cr	27 - 30 %
Cobalt, Co	19 - 21 %
Copper, Cu	<= 0.50 %
Iron, Fe	<= 1.0 %
Manganese, Mn	<= 1.0 %
Nickel, Ni	39.99 - 50.798 %	Balance
Niobium, Nb (Columbium, Cb)	0.40 - 1.1 %
Silicon, Si	<= 1.0 %
Titanium, Ti	1.9 - 2.7 %
Zirconium, Zr	<= 0.10 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

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NINDA15 / 98906

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