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Specialty Compounds RTP Company

TIMET TIMETAL® 551 (Ti-4Al-4Mo-4Sn-0.5Si) Titanium Alloy; 25-100 mm
Categories: Metal; Nonferrous Metal; Titanium Alloy; Alpha/Beta Titanium Alloy

Material Notes: High-Strength Forging Alloy

Industry Specifications: UK Aerospace Specifications BS TA.38, 39, 40, 41, 42.

Features: TIMETAL 551 has high strength and is creep resistant up to 400°C. It has a similar composition to TIMETAL 550, apart from an increase in tin content, which gives increased strength at room and elevated temperatures. This is one of the strongest of the commercially available titanium alloys, with room temperature strengths ranging form 1250 to 1400 MPa. Typical applications include airframe structural forgings and machined parts such as undercarriage components, mounting brackets and pump casing where strength is required at low weight; and gas-turbine engine components. The alloy is also suitable for general engineering applications such as steam-turbine blades, axial and radial compressor parts, connecting rods, and other high-speed rotating and reciprocating components. It is nonmagnetic.

Typical heat treatment for this alloy: Solution heat treatment: 900°C for 1 hr, air cool. Ageing heat treatment: 500°C for 24 hrs, air cool.

Data provided by TIMET.

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Physical PropertiesMetricEnglishComments
Density 4.60 g/cc0.166 lb/in³Typical
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 1310 MPa190000 psiTypical
Tensile Strength, Yield 1200 MPa
@Strain 0.2 %
174000 psi
@Strain 0.2 %
Typical
Elongation at Break 10 %10 %Typical
Reduction of Area 20 %20 %
Modulus of Elasticity 110 - 120 GPa16000 - 17400 ksiTypical
Poissons Ratio 0.340.34Calculated by MatWeb
Fatigue Strength  380 MPa
@# of Cycles 1.00e+8
55100 psi
@# of Cycles 1.00e+8
Notched, Kt = 3.2; 3" (75 mm) square billet
 520 MPa
@# of Cycles 1.00e+8
75400 psi
@# of Cycles 1.00e+8
Smooth; 3" (75 mm) square billet
Shear Modulus 43.0 GPa6240 ksi
Charpy Impact 25.0 J18.4 ft-lbat RT
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.000170 ohm-cm0.000170 ohm-cm
 
Thermal PropertiesMetricEnglishComments
CTE, linear 8.50 µm/m-°C
@Temperature 20.0 - 100 °C
4.72 µin/in-°F
@Temperature 68.0 - 212 °F
Specific Heat Capacity 0.368 J/g-°C0.0880 BTU/lb-°F
Thermal Conductivity 6.92 W/m-K48.0 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 400 °C752 °FUseful creep to 400°C
Beta Transus 1050 °C1920 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 3.0 - 5.0 %3.0 - 5.0 %
Carbon, C 0.050 - 0.20 %0.050 - 0.20 %
Hydrogen, H <= 0.015 %<= 0.015 %
Iron, Fe <= 0.20 %<= 0.20 %
Molybdenum, Mo 3.0 - 5.0 %3.0 - 5.0 %
Nitrogen, N <= 0.050 %<= 0.050 %
Oxygen, O <= 0.25 %<= 0.25 %
Silicon, Si 0.30 - 0.70 %0.30 - 0.70 %
Tin, Sn 3.0 - 5.0 %3.0 - 5.0 %
Titanium, Ti 83.2 - 90.7 %83.2 - 90.7 %Calculated as remainder

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 view all the property values for this datasheet as they were originally entered into MatWeb.

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NTIME551A / 19306

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