What it is
Niobium is a soft, ductile metal used mainly as a microalloying element in high-strength low-alloy (HSLA) steel — pipelines, automotive bodies, structural beams.
Why it matters
Brazil produces around 90% of global supply from a single mine — perhaps the most concentrated supply chain on the critical list.
Circular challenges
Whether niobium re-enters the economy at end-of-life is mostly settled at the design stage. These are the recurring blockers.
Single-mine dependency
One Brazilian operation supplies most of the world; any disruption affects pipeline and automotive steel globally.
Dispersed in steel
Niobium is added at fractions of a percent and cannot be separated from recycled steel — it is diluted across the scrap pool.
Substitution costs strength
Replacing niobium in HSLA steel requires more material or different alloys, raising weight and CO₂ per part.