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TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); 80% Cold Work
Categories: Metal; Nonferrous Metal; Titanium Alloy; Beta Titanium Alloy
Material Notes: Mechanical property data for cold rolled bar aged 900°F (482°C) for 20 hours.

High-Strength, Oxidation Resistant Strip Alloy

Features: Offers the good cold formability and weldability of a beta strip alloy, but with greatly improved oxidation resistance and creep strength. Aerospace applications include engine exhaust plug and nozzle assemblies. The alloy's resistance to aircraft hydraulic fluids, such as Skydrol, is excellent at all temperatures. It is well suited for metal matrix composites because it can be economically rolled to foil, is compatible with most fibers, and is sufficiently stable up to 816°C.

Typical heat treatment for this alloy: Solution treatment: 816-843°C (1500° - 1550°F) for 3-30 min, air cool. Age treatment: 510-679°C (950° - 1275°F) for 8-16 hrs.

Data provided by TIMET.
Key Words: Beta 21S; UNS R58210
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Physical PropertiesOriginal ValueComments
Density 4.94 g/ccTypical
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength, Ultimate 1730 MPa
Tensile Strength, Yield 1420 - 1455 MPa
@Strain 0.2 %
Elongation at Break 4.9 %
Modulus of Elasticity 100 GPaAged 1000°F (538C) for 8 hours
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.000135 ohm-cm
@Temperature 24.0 °C		Aged 1000°F (538°C)
 0.000142 ohm-cm
@Temperature 260 °C		Aged 1000°F (538°C)
 0.000148 ohm-cm
@Temperature 538 °C		Aged 1000°F (538°C)
 0.000148 ohm-cm
@Temperature 816 °C		Aged 1000°F (538°C)
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.07 µm/m-°C
@Temperature 38.0 °C		Aged 1000°F (538°C)
 7.90 µm/m-°C
@Temperature 93.0 °C		Aged 1000°F (538°C)
 8.60 µm/m-°C
@Temperature 204 °C		Aged 1000°F (538°C)
 8.90 µm/m-°C
@Temperature 316 °C		Aged 1000°F (538°C)
 9.20 µm/m-°C
@Temperature 427 °C		Aged 1000°F (538°C)
 9.50 µm/m-°C
@Temperature 538 °C		Aged 1000°F (538°C)
 10.3 µm/m-°C
@Temperature 816 °C		Aged 1000°F (538°C)
Specific Heat Capacity 0.117 BTU/lb-°F
@Temperature 24.0 °C		Aged 1000°F (538°C)
 0.128 BTU/lb-°F
@Temperature 260 °C		Aged 1000°F (538°C)
 0.142 BTU/lb-°F
@Temperature 538 °C		Aged 1000°F (538°C)
 0.155 BTU/lb-°F
@Temperature 816 °C		Aged 1000°F (538°C)
Thermal Conductivity 7.60 W/m-K
@Temperature 33.0 °C		Aged 1000°F (538°C)
 11.8 W/m-K
@Temperature 259 °C		Aged 1000°F (538°C)
 16.9 W/m-K
@Temperature 551 °C		Aged 1000°F (538°C)
 20.8 W/m-K
@Temperature 827 °C		Aged 1000°F (538°C)
Maximum Service Temperature, Air 593 °CStructural Applications
Beta Transus 807 °C
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 2.5 - 3.5 %
Carbon, C <= 0.050 %
Hydrogen, H <= 0.015 %
Iron, Fe <= 0.40 %
Molybdenum, Mo 14 - 16 %
Niobium, Nb (Columbium, Cb) 2.4 - 3.2 %
Nitrogen, N <= 0.050 %
Other, each <= 0.10 %
Other, total <= 0.40 %
Oxygen, O 0.11 - 0.17 %
Silicon, Si 0.15 - 0.25 %
Titanium, Ti 76 - 80.8 %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 go back to viewing the property data in MatWeb's normal format.

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TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); ST 1500°F (816°C) + Age 1000°F (538°C)
TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); 40% Cold Work
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TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); ST 1550°F (843°C) - 1650°F (900°C) + Age 1000°F (538°C)

NTIME21SP / 199882




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