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TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); ST 1550°F (843°C), No Age
Categories: Metal; Nonferrous Metal; Titanium Alloy; Beta Titanium Alloy
Material Notes: Mechanical property data for strip and sheet solution treated 1550°F (843°C) then air-cooled

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 PropertiesMetricEnglishComments
Density 4.94 g/cc0.178 lb/in³Typical
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 793 - 965 MPa115000 - 140000 psi
Tensile Strength, Yield 759 - 931 MPa
@Strain 0.2 %		110000 - 135000 psi
@Strain 0.2 %
Elongation at Break >= 12 %>= 12 %
Modulus of Elasticity 100 GPa14500 ksiAged 1000°F (538C) for 8 hours
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity  0.000135 ohm-cm
@Temperature 24.0 °C		0.000135 ohm-cm
@Temperature 75.2 °F		Aged 1000°F (538°C)
 0.000142 ohm-cm
@Temperature 260 °C		0.000142 ohm-cm
@Temperature 500 °F		Aged 1000°F (538°C)
 0.000148 ohm-cm
@Temperature 538 °C		0.000148 ohm-cm
@Temperature 1000 °F		Aged 1000°F (538°C)
 0.000148 ohm-cm
@Temperature 816 °C		0.000148 ohm-cm
@Temperature 1500 °F		Aged 1000°F (538°C)
 
Thermal PropertiesMetricEnglishComments
CTE, linear  7.07 µm/m-°C
@Temperature 38.0 °C		3.93 µin/in-°F
@Temperature 100 °F		Aged 1000°F (538°C)
 7.90 µm/m-°C
@Temperature 93.0 °C		4.39 µin/in-°F
@Temperature 199 °F		Aged 1000°F (538°C)
 8.60 µm/m-°C
@Temperature 204 °C		4.78 µin/in-°F
@Temperature 399 °F		Aged 1000°F (538°C)
 8.90 µm/m-°C
@Temperature 316 °C		4.94 µin/in-°F
@Temperature 601 °F		Aged 1000°F (538°C)
 9.20 µm/m-°C
@Temperature 427 °C		5.11 µin/in-°F
@Temperature 801 °F		Aged 1000°F (538°C)
 9.50 µm/m-°C
@Temperature 538 °C		5.28 µin/in-°F
@Temperature 1000 °F		Aged 1000°F (538°C)
 10.3 µm/m-°C
@Temperature 816 °C		5.72 µin/in-°F
@Temperature 1500 °F		Aged 1000°F (538°C)
Specific Heat Capacity  0.490 J/g-°C
@Temperature 24.0 °C		0.117 BTU/lb-°F
@Temperature 75.2 °F		Aged 1000°F (538°C)
 0.536 J/g-°C
@Temperature 260 °C		0.128 BTU/lb-°F
@Temperature 500 °F		Aged 1000°F (538°C)
 0.594 J/g-°C
@Temperature 538 °C		0.142 BTU/lb-°F
@Temperature 1000 °F		Aged 1000°F (538°C)
 0.649 J/g-°C
@Temperature 816 °C		0.155 BTU/lb-°F
@Temperature 1500 °F		Aged 1000°F (538°C)
Thermal Conductivity  7.60 W/m-K
@Temperature 33.0 °C		52.7 BTU-in/hr-ft²-°F
@Temperature 91.4 °F		Aged 1000°F (538°C)
 11.8 W/m-K
@Temperature 259 °C		81.9 BTU-in/hr-ft²-°F
@Temperature 498 °F		Aged 1000°F (538°C)
 16.9 W/m-K
@Temperature 551 °C		117 BTU-in/hr-ft²-°F
@Temperature 1020 °F		Aged 1000°F (538°C)
 20.8 W/m-K
@Temperature 827 °C		144 BTU-in/hr-ft²-°F
@Temperature 1520 °F		Aged 1000°F (538°C)
Maximum Service Temperature, Air 593 °C1100 °FStructural Applications
Beta Transus 807 °C1480 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 2.5 - 3.5 %2.5 - 3.5 %
Carbon, C <= 0.050 %<= 0.050 %
Hydrogen, H <= 0.015 %<= 0.015 %
Iron, Fe <= 0.40 %<= 0.40 %
Molybdenum, Mo 14 - 16 %14 - 16 %
Niobium, Nb (Columbium, Cb) 2.4 - 3.2 %2.4 - 3.2 %
Nitrogen, N <= 0.050 %<= 0.050 %
Other, each <= 0.10 %<= 0.10 %
Other, total <= 0.40 %<= 0.40 %
Oxygen, O 0.11 - 0.17 %0.11 - 0.17 %
Silicon, Si 0.15 - 0.25 %0.15 - 0.25 %
Titanium, Ti 76 - 80.8 %76 - 80.8 %Calculated as remainder

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NTIME21SE / 199878




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