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Ensinger PEI

Titanium Ti-4Al-4Mo-2Sn-0.5Si (IMI550), STA
Categories: Metal; Nonferrous Metal; Titanium Alloy; Alpha/Beta Titanium Alloy

Material Notes: Solution Treated 900ºC, Aged 500ºC. Alpha-Beta Alloy, medium strength.

Applications: Aerospace - airframe and engine components.

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Physical PropertiesMetricEnglishComments
Density 4.57 g/cc0.165 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Vickers 360360
Tensile Strength, Ultimate 1100 MPa160000 psi
Tensile Strength, Yield 940 MPa136000 psi
Elongation at Break 7.0 %7.0 %
Modulus of Elasticity 115 GPa16700 ksi
Tensile Modulus  96.0 GPa
@Temperature 400 °C
13900 ksi
@Temperature 752 °F
 107 GPa
@Temperature 200 °C
15500 ksi
@Temperature 392 °F
Notched Tensile Strength 1410 MPa205000 psiKt (stress concentration factor) = 3
Poissons Ratio 0.330.33Typical for alpha-beta titanium alloy.
Fatigue Strength  330 MPa
@# of Cycles 1.00e+7
47900 psi
@# of Cycles 1.00e+7
notched
 390 MPa
@# of Cycles 20000
56600 psi
@# of Cycles 20000
Kt (stress concentration factor) = 3
 820 MPa
@# of Cycles 1.00e+7
119000 psi
@# of Cycles 1.00e+7
unnotched
 1100 MPa
@# of Cycles 2000
160000 psi
@# of Cycles 2000
Unnotched
Fracture Toughness 60.0 MPa-m½54.6 ksi-in½
Shear Modulus 43.2 GPa6270 ksiCalculated from typical values.
Charpy Impact 23.0 J17.0 ft-lbU-Notch
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.000159 ohm-cm0.000159 ohm-cm
 0.000170 ohm-cm
@Temperature 200 °C
0.000170 ohm-cm
@Temperature 392 °F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  8.80 µm/m-°C
@Temperature 20.0 - 100 °C
4.89 µin/in-°F
@Temperature 68.0 - 212 °F
 9.20 µm/m-°C
@Temperature 20.0 - 315 °C
5.11 µin/in-°F
@Temperature 68.0 - 599 °F
average
 9.70 µm/m-°C
@Temperature 20.0 - 500 °C
5.39 µin/in-°F
@Temperature 68.0 - 932 °F
Specific Heat Capacity 0.500 J/g-°C0.120 BTU/lb-°FEstimated from similar materials
Thermal Conductivity 7.50 W/m-K52.0 BTU-in/hr-ft²-°F
 9.50 W/m-K
@Temperature 200 °C
65.9 BTU-in/hr-ft²-°F
@Temperature 392 °F
Melting Point <= 1650 °C<= 3000 °FEstimated from similar materials
Liquidus 1650 °C3000 °FEstimated from similar materials
Beta Transus 975 °C1790 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 4.0 %4.0 %
Hydrogen, H <= 0.0125 %<= 0.0125 %
Iron, Fe <= 0.20 %<= 0.20 %
Molybdenum, Mo 4.0 %4.0 %
O + 2N <= 0.27 %<= 0.27 %
Silicon, Si 0.50 %0.50 %
Tin, Sn 2.0 %2.0 %
Titanium, Ti 89 %89 %

References for this datasheet.

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