Special Metals INCOLOY® Alloy 903

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Special Metals INCOLOY® Alloy 903
Categories:	Metal; Superalloy; Iron Base
Material Notes:	A nickel-iron-cobalt alloy with additions of niobium, titanium, and aluminum for precipitation hardening. The alloy combines high strength with a low and constant coefficient of thermal expansion at temperatures to about 800°F (430°C). It also has a constant modulus of elasticity and is highly resistant to thermal fatigue and thermal shock. Used in gas turbines for rings and casings. Standard product forms are round, flats, forging stock, sheet, and wire. Data provided by the manufacturer, Special Metals.
Key Words:	UNS N19903; AFNOR Z3 NK 38
Vendors:	Visit metalmen for your metals needs. Products include special chemistry, tight tolerances, custom tempers, odd dimensions/forms, and small quantities. Phone 1-800-767-9494. Click here to view all available suppliers for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Original Value	Comments

Density	8.25 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	1310 MPa	Precipitation Hardened
Tensile Strength, Yield	1100 MPa @Strain 0.2 %	Precipitation Hardened
Elongation at Break	14 %	Precipitation Hardened
Modulus of Elasticity	146.8 GPa @Temperature 0.000 °C
	146.9 GPa @Temperature -50.0 °C
	146.9 GPa @Temperature 50.0 °C
	147.2 GPa @Temperature 100 °C
	147.4 GPa @Temperature -100 °C
	147.8 GPa @Temperature 150 °C
	148.4 GPa @Temperature 200 °C
	148.9 GPa @Temperature -195 °C
	149.3 GPa @Temperature 250 °C
	149.8 GPa @Temperature 600 °C
	150.2 GPa @Temperature 300 °C
	151.3 GPa @Temperature 350 °C
	151.8 GPa @Temperature 550 °C
	152.4 GPa @Temperature 400 °C
	153.5 GPa @Temperature 450 °C
	153.9 GPa @Temperature 500 °C
Poissons Ratio	0.226 @Temperature 250 °C
	0.227 @Temperature 300 °C
	0.231 @Temperature 200 °C
	0.236 @Temperature 350 °C
	0.239 @Temperature 50.0 °C
	0.241 @Temperature 400 °C
	0.242 @Temperature 150 °C
	0.247 @Temperature 100 °C
	0.273 @Temperature 450 °C
	0.30 @Temperature 500 °C
	0.318 @Temperature 550 °C
	0.352 @Temperature 600 °C
Shear Modulus	55.4 GPa @Temperature 600 °C
	57.6 GPa @Temperature 550 °C
	59.0 GPa @Temperature 100 °C
	59.2 GPa @Temperature 500 °C
	59.3 GPa @Temperature 50.0 °C
	59.5 GPa @Temperature 150 °C
	60.3 GPa @Temperature 200 °C
	60.3 GPa @Temperature 450 °C
	60.9 GPa @Temperature 250 °C
	61.2 GPa @Temperature 300 °C
	61.2 GPa @Temperature 350 °C
	61.4 GPa @Temperature 400 °C

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000610 ohm-cm
	0.0000650 ohm-cm @Temperature 50.0 °C
	0.0000735 ohm-cm @Temperature 100 °C
	0.0000880 ohm-cm @Temperature 200 °C
	0.000102 ohm-cm @Temperature 300 °C
	0.0001135 ohm-cm @Temperature 400 °C
	0.0001195 ohm-cm @Temperature 500 °C
	0.000122 ohm-cm @Temperature 600 °C
Curie Temperature	415 - 470 °C

Thermal Properties	Original Value	Comments
CTE, linear	7.65 µm/m-°C @Temperature 25.0 - 427 °C
Specific Heat Capacity	0.435 J/g-°C	test temperature not reported
	0.442 J/g-°C @Temperature 50.0 °C
	0.454 J/g-°C @Temperature 100 °C
	0.482 J/g-°C @Temperature 200 °C
	0.507 J/g-°C @Temperature 300 °C
	0.532 J/g-°C @Temperature 400 °C
	0.559 J/g-°C @Temperature 500 °C
	0.584 J/g-°C @Temperature 600 °C
Thermal Conductivity	16.7 W/m-K	test temperature unknown
	16.9 W/m-K @Temperature 50.0 °C
	17.2 W/m-K @Temperature 100 °C
	17.9 W/m-K @Temperature 200 °C
	18.3 W/m-K @Temperature 300 °C
	19.0 W/m-K @Temperature 400 °C
	20.3 W/m-K @Temperature 500 °C
	21.9 W/m-K @Temperature 600 °C
Melting Point	1318 - 1393 °C
Solidus	1318 °C
Liquidus	1393 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	0.90 %
Cobalt, Co	15 %
Iron, Fe	42 %
Nickel, Ni	38 %
Niobium, Nb (Columbium, Cb)	3.0 %
Titanium, Ti	1.4 %

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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NINC84 / 17427

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