BETA 21S

Titanium Alloy, Beta Titanium Alloy, Nonferrous Metal, Welding Wire — Ti-15Mo-3Nb-3Al-0.2Si

BETA 21S Ti-15Mo-3Nb-3Al-0.2Si (Ti-15-3-3-0.2) 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.

Specifications:

UNS R58210
ASTM Grade 21

Typical Chemical Composition (%)
Al	C	H	Fe	Mo	Nb	N	O	Si	T
2.5-3.5	< =0.050	< =0.015	< =0.40	14.0-16.0	2.4-3.2	< =0.050	0.11-0.17	0.15-0.25	76.0-80.8

Overaged, Typical Mechanical Properties
Density	Ultimate Tensile Strength	Yield Tensile Strength	Elongation at Break	Modulus of Elasticity	Electrical Resistivity
4.94 g/cc	930 MPa	860 MPa @Strain 0.2%	14%	96.0-103 GPa	0.000135 ohm-cm