Why Titanium Is Used in Aerospace
In this blog, we’ll break down the properties, applications, and advantages of oxygen-free copper, helping you understand why it’s preferred over standard copper in various industries.
Why Titanium Is Used in Aerospace
Titanium shows up everywhere in modern aircraft — airframes, engine components, fasteners, landing gear. The reason is a combination of properties no other affordable metal matches at once: it’s light, strong, heat-tolerant, and corrosion-proof.
Strength-to-weight ratio
This is the headline. Titanium is about 40% lighter than steel but, in its Grade 5 alloy form, can rival steel’s strength. For aircraft, every kilogram saved is fuel saved over the life of the airframe — so a metal that’s strong and light is worth its price.
Heat resistance
Titanium retains its strength at temperatures that would soften aluminium, which is why it’s used in engine areas and around exhaust structures. This high-temperature stability is a big reason Grade 5 titanium is the aerospace default.
Corrosion and fatigue resistance
Titanium forms a stable oxide layer that resists corrosion from the atmosphere, fuel, and hydraulic fluids — critical over an airframe’s decades-long service life. Its excellent fatigue resistance also suits parts that flex through millions of load cycles.
Common aerospace forms
Aerospace uses titanium as sheet for skins and brackets (titanium sheet specifications) and as bar for machined fittings and fasteners (titanium round bar applications).
FAQ
Which titanium grade is most used in aerospace? Grade 5 (Ti-6Al-4V), for its strength-to-weight ratio.
Why not just use aluminium? Aluminium is lighter but loses strength at high temperatures, and is less fatigue-resistant, whereas titanium holds up.
Sourcing titanium for aerospace or high-performance work? Get in touch or explore the full titanium materials guide.
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A: Carbon steel relies on carbon content alone for its properties. Alloy steel adds elements like chromium, nickel, molybdenum, and vanadium to achieve specific improvements — higher strength, better low-temperature toughness, creep resistance, or corrosion resistance — giving it a far broader performance range than carbon steel.
A: For ambient to 400°C service, ASTM A516 Grade 70 is the standard choice. For high-temperature refinery or power plant use (up to 600°C), ASTM A387 Grade 11 or 22 (chrome-moly) applies. For cryogenic service down to -196°C, 9% nickel steel (ASTM A553) is required.
A: Wear-resistant grades like AR400/AR500 are quenched to martensitic hardness of 370–500 HB — 3–4× harder than structural grades like A572-50. They resist abrasive wear in mining and construction equipment but have limited weldability and are not suitable as primary structural members.
A: CE (= C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) predicts susceptibility to hydrogen-induced cold cracking during welding. Sheets with CE above ~0.40 require preheating to slow cooling and allow hydrogen diffusion, preventing weld cracking. Always develop a qualified WPS based on the specific CE value.
