TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); Aged at 538°C

Category	Metal , Nonferrous Metal , Titanium Alloy , Beta Titanium Alloy
Manufacturer	TIMET
Trade Name	TIMETAL®
Port	Ningbo port,China
Trade Terms	FOB, CFR, CIF
Payment Terms	L/C, T/T, Western Union
Download PDF	TIMET TIMETAL® 21S Titanium Alloy (Ti-15Mo-3Nb-3Al-0.2Si, ASTM Grade 21); Aged at 538°C.pdf
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Material Notes:

High-Strength, Oxidation Resistant Strip AlloyFeatures: 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 for 3-30 min, air cool. Age treatment: 510-679°C for 8-16 hrs. Data provided by TIMET.

Physical Properties	Metric	English	Comments
Density	4.94 g/cc	0.178 lb/in³	Typical

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	1310 MPa	190000 psi	Typical
Tensile Strength, Yield	1210 MPa @Strain 0.200 %	175000 psi @Strain 0.200 %	Typical
Elongation at Break	8.0 %	8.0 %	Typical
Modulus of Elasticity	103 - 110 GPa	14900 - 16000 ksi	Typical

Thermal Properties	Metric	English	Comments
CTE, linear	7.07 µm/m-°C @Temperature 38.0 °C	3.93 µin/in-°F @Temperature 100 °F
	8.90 µm/m-°C @Temperature >=316 °C	4.94 µin/in-°F @Temperature >=601 °F
	9.50 µm/m-°C @Temperature 538 °C	5.28 µin/in-°F @Temperature 1000 °F
Specific Heat Capacity	0.490 J/g-°C	0.117 BTU/lb-°F
Thermal Conductivity	7.60 W/m-K	52.7 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	816 °C	1500 °F	Use in metal matrix composites
Beta Transus	800 °C	1470 °F

Component Elements Properties	Metric	English	Comments
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 %
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

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000135 ohm-cm	0.000135 ohm-cm

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