Titanium Ti-4Al-4Mo-2Sn-0.5Si (IMI550), STA

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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 Properties	Metric	English	Comments

Density	4.57 g/cc	0.165 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	360	360
Tensile Strength, Ultimate	1100 MPa	160000 psi
Tensile Strength, Yield	940 MPa	136000 psi
Elongation at Break	7.0 %	7.0 %
Modulus of Elasticity	115 GPa	16700 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 MPa	205000 psi	K_t (stress concentration factor) = 3
Poissons Ratio	0.33	0.33	Typical 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	K_t (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-m½	54.6 ksi-in½
Shear Modulus	43.2 GPa	6270 ksi	Calculated from typical values.
Charpy Impact	23.0 J	17.0 ft-lb	U-Notch

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000159 ohm-cm	0.000159 ohm-cm
	0.000170 ohm-cm @Temperature 200 °C	0.000170 ohm-cm @Temperature 392 °F

Thermal Properties	Metric	English	Comments
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-°C	0.120 BTU/lb-°F	Estimated from similar materials
Thermal Conductivity	7.50 W/m-K	52.0 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 °F	Estimated from similar materials
Liquidus	1650 °C	3000 °F	Estimated from similar materials
Beta Transus	975 °C	1790 °F

Component Elements Properties	Metric	English	Comments
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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MTP551 / 14233

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