Carpenter Thermo-Span® Fe-Co-Ni Superalloy

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Carpenter Thermo-Span® Fe-Co-Ni Superalloy
Categories:	Metal; Superalloy; Iron Base
Material Notes:	Data provided by Carpenter Technology Corporation. Thermo-Span® alloy is a precipitation hardenable superalloy which exhibits a low coefficient of thermal expansion over a broad temperature range, high tensile and rupture strengths, and good thermal fatigue resistance. This alloy offers a significant improvement in environmental resistance over Pyromet® alloys CTX-1, CTX-3, AND CTX-909 due to the addition of chromium. the alloy also possesses an excellent combination of tensile properties and stress rupture strength in the recrystallized condition with the use of common solution and age hardening treatments. Unlike the CTX-family of alloys, the use of specific braze-cycle age hardening treatments is not required for Thermo-Span alloy due to the higher solution treating temperature. Thermo-Span alloy should be considered for use in all applications for which the current low expansion superalloys are suited. These include compressor and exhaust casings, seals and other gas turbine components. Additional high temperature applications where moderate oxidation resistance is required are feasible with Thermo-Span alloy. This alloy should also be considered for use in applications requiring resistance to thermal fatigue. Thermo-Span® is a registered trademark of Carpenter Technology Corporation.
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Physical Properties	Original Value	Comments

Density	8.23 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	1227 MPa
	579 MPa @Temperature 760 °C
	678 MPa @Temperature 732 °C
	800 MPa @Temperature 705 °C
	904 MPa @Temperature 677 °C
	1055 MPa @Temperature 649 °C
	1089 MPa @Temperature 538 °C
	1175 MPa @Temperature 260 °C
Tensile Strength, Yield	876 MPa @Strain 0.2 %
	496 MPa @Strain 0.2 %, Temperature 760 °C
	579 MPa @Strain 0.2 %, Temperature 732 °C
	662 MPa @Strain 0.2 %, Temperature 705 °C
	745 MPa @Strain 0.2 %, Temperature 677 °C
	807 MPa @Strain 0.2 %, Temperature 538 °C
	814 MPa @Strain 0.2 %, Temperature 649 °C
	841 MPa @Strain 0.2 %, Temperature 260 °C
Elongation at Break	16 %	In 4D
	15 % @Temperature 538 °C	In 4D
	16 % @Temperature 260 °C	In 4D
	19 % @Temperature 677 °C	In 4D
	20 % @Temperature 649 °C	In 4D
	24 % @Temperature 705 °C	In 4D
	25 % @Temperature 732 °C	In 4D
	30 % @Temperature 760 °C	In 4D
Reduction of Area	32 %
	32 % @Temperature 732 °C
	34 % @Temperature 260 °C
	35 % @Temperature 538 °C
	35 % @Temperature 677 °C
	46 % @Temperature 705 °C
	49 % @Temperature 649 °C
	67 % @Temperature 760 °C
Modulus of Elasticity	145 GPa @Temperature 982 °C
	165 GPa @Temperature 649 °C
	189 GPa @Temperature 23.0 °C

Thermal Properties	Original Value	Comments
CTE, linear	7.70 µm/m-°C @Temperature 25.0 - 204 °C
	8.30 µm/m-°C @Temperature 25.0 - 316 °C
	11.0 µm/m-°C @Temperature 25.0 - 538 °C
Specific Heat Capacity	0.463 J/g-°C @Temperature 23.0 °C
	0.518 J/g-°C @Temperature 202 °C
	0.549 J/g-°C @Temperature 652 °C
Thermal Conductivity	11.3 W/m-K @Temperature 23.0 °C
	15.0 W/m-K @Temperature 202 °C
	22.1 W/m-K @Temperature 652 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	0.30 - 0.60 %
Boron, B	<= 0.010 %
Carbon, C	<= 0.050 %
Chromium, Cr	5.0 - 6.0 %
Cobalt, Co	28 - 30 %
Copper, Cu	<= 0.50 %
Iron, Fe	34 %	as remainder
Manganese, Mn	<= 0.50 %
Nickel, Ni	23.5 - 25.5 %
Niobium, Nb (Columbium, Cb)	4.5 - 5.2 %
Phosphorus, P	<= 0.015 %
Silicon, Si	0.20 - 0.30 %
Sulfur, S	<= 0.015 %
Titanium, Ti	0.70 - 1.0 %

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NCARB0 / 15712

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