Ti-5Al-5V-5Mo-3Cr (Ti-5553)

UNS R58550 titanium
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Beta-rich near-beta titanium alloy with superior hardenability for large-section heat treatment. Developed to replace Ti-10-2-3 in Boeing 787 landing gear applications.

Applicable Standards

  • AMS 6945
  • BMS 7-356

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Ti 80.0 88.0 ~84.0
V 4.5 5.5 ~5.0
Al 4.5 5.5 ~5.0
Mo 4.5 5.5 ~5.0
Cr 2.5 3.5 ~3.0
Fe — 0.5 ~0.25
Ti 80.0–88.0% V 4.5–5.5% Al 4.5–5.5% Mo 4.5–5.5% Cr 2.5–3.5% Fe 0.0–0.5%

Typical Applications

  • Landing gear components (Boeing 787)
  • Airframe forgings
  • Structural bulkheads
  • High-strength titanium fasteners
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