Sub-system
Landing gear, engine discs, wing joints and pylons carry concentrated loads at temperature, and no composite does that. They are forged from titanium and nickel superalloys on a small number of very large presses, and that capacity has repeatedly been the aerospace industry's binding constraint.
In one sentence
Aerospace forgings are structural parts shaped under enormous pressure from titanium alloy, nickel superalloy or high-strength steel, producing a grain structure aligned to the load that a machined or cast part cannot match.
Forging works the metal so its internal grain flows along the part's shape, which gives fatigue strength far beyond a part machined from bar stock. For anything that will be cycled millions of times with a life-safety consequence — a landing gear leg, a turbine disc — that is not an optimisation, it is the only acceptable process.
The presses that do this at aerospace scale number in the low tens worldwide. They are enormous, decades old in many cases, and cannot be duplicated quickly. Combined with the qualification burden on every part, that produces a supply chain with very little slack: when demand rises, the queue lengthens rather than the capacity growing.
Two industries stand behind that part, and they are not the same industry. One wins titanium from ore and melts alloy to a cleanliness no ordinary mill reaches; the other operates the presses that shape what the first one sells. A melt shop owns furnaces and metallurgists, a forge shop owns presses and dies, and outside one vertically integrated Russian producer almost nobody owns both.
Split by stage — melting the metal, and shaping it into a part.
It has roughly the strength of steel at about half the density, keeps that strength at temperatures that would soften aluminium, resists corrosion, and — unusually — is galvanically compatible with carbon fibre. That last point matters: aluminium in contact with carbon fibre corrodes, so composite airframes use proportionally far more titanium than metal ones did.
A forged part is machined down substantially before it flies, so the ratio of metal bought to metal delivered can be several to one. Since titanium and superalloy are expensive and slow to produce, reducing that ratio — with near-net-shape forging, or additive manufacturing for some parts — is where much of the cost engineering goes.
Titanium sponge and mill products are produced by a small number of integrated producers, historically including a major Russian supplier whose position made the industry's dependence explicit. Qualification is per-part and per-source, so shifting away from a supplier is a multi-year programme rather than a purchasing decision.
1 of these is marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
Each part is approved against a specific alloy, melt route and process; changing any of them means re-qualifying.
Type certificationThe presses that forge aerospace parts at size number in the low tens worldwide and take years to build. When demand rises the queue lengthens rather than the capacity growing.
Sponge comes from a small number of integrated producers in a few countries, and qualification is per source. A supplier lost to sanctions or outage cannot be replaced within a programme's planning horizon.
Superalloy discs and cases are melted from nickel and a short list of alloying elements; aerospace competes for the same refined class of metal as other industries.
Nickel and cobaltOther pages in this map that name Titanium and forgings as something they cannot do without.
Every company named on a step below this page, ordered by how many of those steps it appears at. Compiled from the pages themselves rather than written separately, so the two cannot disagree. Not a ranking and not a recommendation.
1 more company appears at a single step each; they are named on the pages for those steps.
Whether forging and casting capacity expands, or remains the limit on production rates.
Whether additive manufacturing takes meaningful share of small structural and engine parts.
Whether titanium sourcing continues shifting away from its historical concentration.
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.
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