What Is Titanium? Uses, Properties & Critical Metal Role

• What is titanium: a lightweight, corrosion-resistant transition metal
• Density of 4.5 g/cm³, roughly 45% lighter than steel
• China refines nearly 70% of the world’s titanium sponge metal
• Aerospace and defence drive most strategic demand
• USGS and the EU classify titanium as a critical mineral
• Kroll process converts ore into pure titanium sponge metal

What Is Titanium?

What is titanium? It is a silver-grey transition metal, symbol Ti, atomic number 22, prized for a strength-to-weight ratio that few other metals can match. Pure titanium has a density of just 4.5 g/cm³, meaning it delivers comparable strength to some grades of steel at roughly 45% of the weight. It was discovered in Cornwall in 1791, but was not isolated in usable metallic form until well over a century later, because separating titanium from oxygen and other impurities turned out to be extraordinarily difficult.

Titanium is the ninth most abundant element in the Earth’s crust, yet it never occurs naturally in pure metallic form. It is always locked inside mineral ores, principally ilmenite and rutile, bound so tightly to oxygen that conventional smelting methods used for iron or copper simply do not work on it. That single fact, more than any shortage of raw ore, is the root of most of the supply chain challenges discussed later in this article.

Key Properties of Titanium

Titanium’s defining characteristics are its corrosion resistance and biocompatibility. A thin, self-healing oxide layer forms instantly on exposed titanium, protecting it against saltwater, chlorine and most acids. It withstands temperatures up to 1,668°C before melting, and the human body does not reject it, which is why it is the standard material for joint replacements and dental implants. Commercially pure titanium is non-magnetic, a relatively poor conductor of heat and electricity, and can be alloyed with aluminium, vanadium or molybdenum to raise its tensile strength substantially further.

For a full technical breakdown of titanium’s atomic structure and chemistry, see the Royal Society of Chemistry’s periodic table entry.

Where Does Titanium Come From?

Titanium is mined as ilmenite and rutile ore, then converted into a porous form called titanium sponge, most commonly via the energy-intensive Kroll process, which reduces titanium tetrachloride with magnesium under an inert atmosphere. This conversion step, not the mining itself, is the true bottleneck in the supply chain. According to the USGS Mineral Commodity Summaries, China produced roughly 69% of the world’s titanium sponge metal in 2024, with Japan a distant second at around 17%. Russia remains a significant producer through VSMPO-AVISMA despite ongoing Western sanctions pressure related to the war in Ukraine.

Ore mining is more geographically spread than refining, with Mozambique, South Africa and Australia among the largest producers of ilmenite and rutile concentrate. But that ore still has to be refined somewhere, and refining capacity is where the real concentration risk sits.

What Is Titanium Used For?

Roughly two-thirds of titanium metal produced goes into aircraft frames and engines, where its heat resistance and strength-to-weight ratio have no practical substitute. The F-22 Raptor is around 40% titanium alloy by weight, and the F-35 uses titanium for close to a third of its structural weight. The metal is equally critical in naval applications, where its immunity to saltwater corrosion makes it standard for submarine hulls, propulsion plumbing and sonar equipment. Investors and procurement teams tracking near-term supply and demand can follow CMN’s titanium price tracker for current market data.

Beyond defence, titanium dioxide pigment accounts for around 95% of all titanium produced, used in paints, plastics, cement and sunscreens for its brightness and UV resistance. Medical applications include hip and knee replacements, dental implants and surgical instruments, all benefiting from the metal’s biocompatibility and long service life. Consumer and industrial uses round out demand: premium laptop and phone casings, bicycle frames, desalination plant piping, and chemical processing equipment exposed to corrosive media all rely on titanium where cheaper metals would fail.

Why Is Titanium Considered a Critical Mineral?

Both the USGS and the EU’s Critical Raw Materials Act classify titanium as a critical mineral, not because the ore is scarce, but because refining capacity is so concentrated and substitution options are so limited. Western nations mine substantial titanium ore but process most of it into pigment rather than aerospace-grade sponge metal, leaving Boeing, Airbus and defence contractors reliant on a small number of foreign refiners. In applications like stealth airframes and submarine hulls, there is effectively no substitute metal that matches titanium’s combination of strength, weight and corrosion resistance.

Governments and manufacturers are responding on several fronts: recycling manufacturing scrap, known in the industry as “revert,” has become a priority because it sidesteps the slow Kroll process entirely, and aerospace buyers are actively diversifying ore sourcing toward more politically stable jurisdictions. That combination of thin refining capacity and near-zero substitutability is what separates a critical mineral from a merely useful one — for more on how CMN defines the category, see the critical minerals explainer.

For procurement and investment teams, the practical takeaway on what is titanium’s real vulnerability is that risk sits downstream of the mine. Diversifying ore sources does little to change exposure unless it is matched by new refining capacity outside the current handful of producing countries.