What Is Titanium
Titanium is element 22 — a lustrous, silver-grey metal with a property combination that no other structural material matches: it is as strong as steel at roughly half the weight, and it resists corrosion in environments that destroy almost everything else, including seawater, chlorine, and human body chemistry. Those two properties together — exceptional strength-to-weight ratio and near-universal corrosion resistance — place titanium inside a short list of applications where failure is not acceptable and substitution is not available.
Titanium is not rare. It is the fourth most abundant structural metal in the earth's crust, behind aluminum, iron, and magnesium. It is present in virtually every rock and soil type on earth. The challenge is not finding it — it is extracting it. Titanium ore does not yield metallic titanium through conventional smelting. It requires a complex, energy-intensive conversion process that produces titanium sponge (a porous, irregular solid — the primary form of refined titanium metal before it is melted and processed into usable alloy) as an intermediate product. That conversion process has remained fundamentally unchanged since 1940. Its constraints are titanium's constraints.
Plain English
Titanium is abundant, light, strong, and corrosion-resistant. It is also expensive and difficult to produce — not because it is scarce, but because of how it has to be made. The metal is common. The process is the problem.
Titanium is not rare. The Kroll process is.
What Titanium Does
Approximately 50–60% of titanium mill products (rolled, forged, or extruded titanium alloy forms ready for manufacturing) go into aircraft structures, jet engine components, and defense systems. Titanium alloys are used in airframe structural members, landing gear, engine fan blades, compressor discs, and fasteners throughout commercial and military aircraft. The Boeing 787 Dreamliner contains approximately 15% titanium by structural weight. The F-22 and F-35 use titanium extensively in their airframes. There is no structural material that replaces titanium in these applications at the same weight with the same strength.
The medical application is the second major use. Titanium's biocompatibility (the property of not triggering immune response or corrosion inside human tissue) makes it the dominant material for orthopedic implants — hip and knee replacements, spinal implants, dental implants, and bone screws. Every major joint replacement surgery almost certainly involves titanium.
Industrial applications — chemical processing equipment, desalination plant components, offshore oil and gas hardware, and heat exchangers — use titanium specifically because of its corrosion resistance in extreme chemical and marine environments. And the energy transition adds incremental demand: hydrogen electrolyzers (the devices that split water into hydrogen and oxygen using electricity) use titanium components because of its resistance to the corrosive electrolyte solutions involved.
Plain English
Titanium is in every commercial aircraft, every military jet, every joint replacement, and the chemical processing equipment that keeps refineries and desalination plants running. The applications cannot substitute away from it. That is the demand story. The production story is what limits the supply.
Titanium's demand is structural and defense-anchored. Its supply is constrained by a single bottleneck that has not been meaningfully disrupted since 1940.
The Kroll Dependency
The Kroll process (developed by Wilhelm Kroll, the metallurgical process that converts titanium tetrachloride — itself derived from titanium ore — into metallic titanium through reaction with magnesium in a sealed reactor) is how virtually all commercial titanium metal is produced. The process is batch-based (each reactor cycle produces a fixed quantity and must then be emptied and recharged), energy-intensive, slow, and capital-heavy. A Kroll reactor cycle takes days. The titanium sponge it produces must then be crushed, blended, melted, and cast before it can become usable alloy. The entire chain from ore to aerospace-grade titanium alloy involves multiple energy-intensive steps with long cycle times and high capital requirements.
Titanium is the fourth most abundant structural metal in the earth's crust. It costs more per kilogram than most metals because of one bottleneck: the only commercial process to extract it from ore was invented in 1940 and nobody has replaced it.
The geopolitical layer compounds the process constraint. Russia was historically one of the world's largest titanium sponge producers — VSMPO-AVISMA supplied a significant share of Western aerospace titanium before 2022. Western sanctions following Russia's invasion of Ukraine disrupted that supply route. Western aerospace manufacturers — Boeing, Airbus, and their engine and systems suppliers — have been managing the transition to non-Russian titanium since 2022, accelerating procurement from Japan (Toho Titanium, Osaka Titanium), Kazakhstan, and building out Western capacity. The transition is ongoing and has contributed to persistent supply tightness in aerospace-grade titanium.
China has built dominant titanium sponge production capacity over the past two decades — accounting for approximately 50–60% of global sponge output. Chinese sponge is primarily consumed domestically by China's rapidly expanding aerospace and industrial sectors, but Chinese production volumes and pricing influence the global market. Western aerospace supply chains are not structurally dependent on Chinese titanium in the way they were on Russian — but the concentration of global sponge capacity in China is a strategic data point that Western procurement planners are increasingly tracking.
Plain English
The Kroll process is the bottleneck. It is slow, expensive, and eighty years old. Russia was a major Western supplier until sanctions cut that off. China now makes most of the world's sponge. Western aerospace is scrambling to secure non-Russian, non-Chinese supply from Japan and Kazakhstan. The process constraint makes building new capacity slow and capital-intensive. The geopolitical constraint made the transition urgent before the capacity existed.
The Kroll process is eighty years old, it is slow, and it is the only way anyone makes titanium at commercial scale. That is the supply chain in one sentence.
Where It Comes From
Titanium ore comes primarily in two forms: ilmenite (iron titanium oxide — the dominant ore by volume, lower grade, used for titanium dioxide pigment as well as metal production) and rutile (a higher-purity titanium dioxide mineral, preferred for sponge production). Major ilmenite and rutile producers include Australia, South Africa, Canada, and Mozambique, with significant deposits also in India, Ukraine, and Norway.
The ore supply is not the constraint. Conversion of ore to sponge is.
China accounts for approximately 50–60% of global titanium sponge production, with capacity built out substantially over the past two decades to serve domestic aerospace, industrial, and consumer demand. Japan is the next largest producer of high-quality aerospace-grade sponge — Toho Titanium and Osaka Titanium are the primary Japanese producers and have become critical Western aerospace suppliers following the Russian disruption. Kazakhstan (UKTMP) is an additional non-Chinese, non-Russian producer of growing importance. Russia's VSMPO-AVISMA remains a large producer but is inaccessible to Western buyers under current sanctions.
The United States has very limited titanium sponge production. The last major US sponge producer, ATI, exited sponge production and now focuses on downstream mill products — purchasing sponge from Japan and Kazakhstan and converting it into the rolled, forged, and extruded alloy forms that aerospace and defense customers require.
Plain English
The ore is in Australia and Africa. The sponge is made in China, Japan, and Russia. The US makes the finished alloy products but buys most of its sponge from Japan and Kazakhstan. Russia was a critical link until sanctions cut it. China makes the most sponge globally but primarily for domestic use. The supply chain is functional but fragile at the sponge production layer.
The Market Structure
Titanium sponge prices have been elevated and volatile since 2022, when the Russian supply disruption hit Western aerospace procurement simultaneously with a commercial aviation recovery following pandemic-era production cuts. The SMM domestic China benchmark for grade 0 titanium sponge sits at approximately $6.34 per kilogram as of May 2026 — up approximately 10.5% year over year, within a range of $6.08–6.67 per kilogram across grade and source variations.
The price reflects the intersection of genuine aerospace demand recovery — Boeing and Airbus ramping production, defense procurement accelerating — with a supply chain that is still absorbing the loss of Russian material. Japanese and Kazakh producers have expanded, but capacity expansion in the Kroll process is not fast. New sponge capacity requires years of capital investment and qualification testing before aerospace customers will accept it. The aerospace supply chain does not buy from new suppliers without extensive qualification processes that take one to three years minimum.
The price at $6.34 per kilogram is not a crisis price — it reflects structural tightness rather than acute shortage. But it is an elevated structural baseline compared to the pre-2022 environment, and it is unlikely to revert to prior levels while Russian supply remains inaccessible to Western buyers and Chinese sponge remains primarily consumed domestically.
Plain English
Prices are up and staying up. The Russian supply disruption created a structural gap that Japan and Kazakhstan are filling slowly. Aerospace demand is recovering and growing. New sponge capacity qualifies slowly. The Kroll process means you cannot rush the answer. The market is tight and the tightness is structural.
Why It's on This List
ScarceEarth covers titanium because it is the clearest example of a critical mineral where the constraint is not geology but process — and where process constraints are nearly as durable as geological ones.
Titanium's story is not about Chinese export controls or rare earth separation monopolies. It is about the eighty-year-old production process that every piece of aerospace and defense titanium passes through, and the geopolitical disruption that removed one major supplier from Western supply chains while the process bottleneck prevents a fast response.
The Kroll dependency is the story. Solving it — building new sponge capacity that qualifies with aerospace customers, or developing alternative production processes like IperionX's hydrogen-assisted metallothermic reduction that could eventually reduce energy intensity and batch limitations — is a decade-long project. In the meantime, Western aerospace runs on Japanese and Kazakh sponge, pays an elevated structural price for it, and hopes China keeps consuming its own sponge domestically.
Plain English
Watch titanium for sponge capacity qualification news, not spot price moves. The signal is whether new non-Chinese, non-Russian sponge production qualifies with Boeing, Airbus, and the major engine manufacturers at commercial scale. Until alternative process technology scales or new Kroll capacity qualifies, the supply chain runs on a small number of suppliers for a metal that aerospace and defense cannot replace.