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Ensinger PEI

Special Metals INCOLOY® alloy 908  (discontinued **)
Categories: Metal; Superalloy; Iron Base; Nickel Base
Material Notes: INCOLOY® alloy 908 (UNS N09908) is an age-hardenable nickel-iron alloy which exhibits a low coefficient of thermal expansion, high tensile strength, high fracture and impact toughness, fatigue crack growth resistance, good ductility, metallurgical stability and weldability plus sufficient resistance to stress accelerated grain boundary oxygen embrittlement (SAGBO) to permit hot fabrication without cracking. This cobalt-free, low CTE alloy was designed to meet sheathing material requirements for internally cooled Nb3Sn superconductor magnets to be used in prototype fusion reactors at cryogenic operating temperatures of -452°F (-269°C). With low temperature properties it is excellent for cryogenic applications.

Information Provided by Special Metals Corporation
Key Words: UNS N09908; ASTM B 872
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Physical PropertiesMetricEnglishComments
Density 8.17 g/cc0.295 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell C 38 - 4038 - 40
Tensile Strength at Break 1172 MPa170000 psi
Tensile Strength, Yield 827 MPa
@Strain 0.2 %		120000 psi
@Strain 0.2 %
Elongation at Break 12 %12 %
Modulus of Elasticity 163.3 GPa23690 ksi
Poissons Ratio 0.2650.265
Shear Modulus 64.6 GPa9370 ksi
 
Electrical PropertiesMetricEnglishComments
Curie Temperature 282 °C540 °F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  8.59 µm/m-°C
@Temperature 93.0 °C		4.77 µin/in-°F
@Temperature 199 °F
 8.66 µm/m-°C
@Temperature 260 °C		4.81 µin/in-°F
@Temperature 500 °F
 11.11 µm/m-°C
@Temperature 427 °C		6.172 µin/in-°F
@Temperature 801 °F
 12.2 µm/m-°C
@Temperature 538 °C		6.78 µin/in-°F
@Temperature 1000 °F
 13.18 µm/m-°C
@Temperature 649 °C		7.322 µin/in-°F
@Temperature 1200 °F
 14.11 µm/m-°C
@Temperature 760 °C		7.839 µin/in-°F
@Temperature 1400 °F
Specific Heat Capacity 0.439 J/g-°C0.105 BTU/lb-°F
Thermal Conductivity 11.05 W/m-K76.69 BTU-in/hr-ft²-°F
Melting Point 1361 - 1410 °C2482 - 2570 °F
Solidus 1361 °C2482 °F
Liquidus 1410 °C2570 °F
Minimum Service Temperature, Air <= -269 °C<= -452 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 0.75 - 1.25 %0.75 - 1.25 %
Boron, B <= 0.012 %<= 0.012 %
Carbon, C <= 0.030 %<= 0.030 %
Chromium, Cr 3.75 - 4.5 %3.75 - 4.5 %
Cobalt, Co <= 0.50 %<= 0.50 %
Copper, Cu <= 0.50 %<= 0.50 %
Iron, Fe 35.588 - 44.6 %35.588 - 44.6 %Balance
Manganese, Mn <= 1.0 %<= 1.0 %
Nickel, Ni 47 - 51 %47 - 51 %
Niobium, Nb (Columbium, Cb) 2.7 - 3.3 %2.7 - 3.3 %
Phosphorus, P <= 0.015 %<= 0.015 %
Silicon, Si <= 0.50 %<= 0.50 %
Sulfur, S <= 0.0050 %<= 0.0050 %
Titanium, Ti 1.2 - 1.8 %1.2 - 1.8 %

**
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