Ti-15V-3Al-3Sn-3Cr is a beta titanium alloy developed for aerospace and high-performance structural applications requiring high strength-to-weight ratio, excellent corrosion resistance, and good fabricability in the cold-worked condition. It is often used in thin-gauge aerospace components and can be solution treated and aged (STA) for optimal mechanical properties.
Ti-15-3-3-3 is fully cold formable in the beta condition and responds well to aging, making it suitable for high-strength formed parts like brackets, springs, and stiffeners.
Common Product Forms
Sheet & Strip (for cold forming & aging)
Plate
Bars & Forgings
Wire & Spring Wire
Tubing (limited, mostly aerospace systems)
Chemical Composition (per AMS 4914, AMS 4916, AMS 4918)
|
Element |
Content (%) |
|
Titanium (Ti) |
Balance |
|
Vanadium (V) |
14.0 – 16.0 |
|
Aluminum (Al) |
2.5 – 3.5 |
|
Tin (Sn) |
2.5 – 3.5 |
|
Chromium (Cr) |
2.5 – 3.5 |
|
Iron (Fe) |
≤ 0.25 |
|
Oxygen (O) |
≤ 0.09 |
|
Carbon (C) |
≤ 0.05 |
|
Nitrogen (N) |
≤ 0.03 |
|
Hydrogen (H) |
≤ 0.015 |
Mechanical Properties (Typical, Aged Condition)
|
Property |
Value (Typical) |
|
Tensile Strength |
1,030–1,380 MPa (150–200 ksi) |
|
Yield Strength (0.2% OS) |
965–1,310 MPa (140–190 ksi) |
|
Elongation |
8–12% |
|
Elastic Modulus |
~104 GPa |
|
Hardness (HRC) |
35–44 |
|
Density |
4.77 g/cm³ |
Mechanical properties vary with aging temperature/time. Higher strengths can be achieved through cold working before aging.
Thermal Properties
|
Property |
Value |
|
Melting Point |
~1,650 °C |
|
Thermal Conductivity |
~7 W/m·K |
|
Coefficient of Thermal Expansion |
~9.2 × 10⁻⁶ /°C |
|
Specific Heat Capacity |
~520 J/kg·K |
|
Aging Temperature |
~480–595 °C (STA) |
Applications of Ti-15-3-3-3
Aerospace
Frame clips, stiffeners, and brackets
Hydraulic tubing systems
Actuator housings
Formed sheet parts (wings, fuselage)
High-Performance & Motorsport
Suspension springs
Lightweight structural parts
High-performance brackets
Industrial / Defense
Fasteners
Springs under dynamic fatigue loads
UAV and missile components
Often selected where formability, weight saving, and strength must be balanced in a non-welded structure.
Applicable Standards
AMS 4914 / AMS 4916 / AMS 4918-Sheet, strip, plate
AMS 4958 / AMS 4959-Wire and welding rod
AMS 4928-Bar, forgings
ASTM B265 (non-officially referenced in some applications)
MIL-T-9047 (legacy spec)
Exceptional cold formability in solution-treated condition
High strength after aging
Lightweight (higher density than CP Ti but much stronger)
Excellent fatigue resistance
Good corrosion resistance, especially to saltwater and chemicals
Heat-treatable and adaptable to forming + aging cycles
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