Material Insights · Understanding the Material World

Steel and Vanadium

Steel is both vanadium's main customer and, in China, its main source: a few hundred grams per tonne strengthens rebar, and most Chinese vanadium is recovered from the slag of iron made from vanadium-bearing ore, so steel output drives demand and supply at once.

Steel (commodity) and Vanadium (commodity): 5 relationships.

How they are linked

1. Microalloying strengthens rebar

Physical flow · Strong · Vanadium → high-strength steel

Small additions of vanadium refine the grain of steel and raise its strength, which lets builders use higher-grade, lighter reinforcing bar.

  • over 90% share of US vanadium use as an alloying agent for iron and steel, 2025
  • 0.03% vanadium in Chinese Grade 3 hot-rolled rebar
  • about 0.3 kg/t vanadium in HRB400 rebar, industry estimate

Stronger grades need more: about 0.06% in Grade 4 and over 0.1% in Grade 5 rebar, or about 0.6 kg per tonne for HRB500, while HRB600 is expected to need four to five times the vanadium of HRB400. The amounts are tiny per tonne of steel, but because rebar is made in such volume, steel sets vanadium demand.

Sources: USGS; Engineering News (Creamer Media); Metalnomist

2. Vanadium from ironmaking slag

Joint production · Asymmetric · Ironmaking from titanomagnetite → vanadium slag

In China vanadium is a coproduct of steelmaking from vanadium-bearing titanomagnetite ore: the vanadium collects in the slag, which is then processed into vanadium pentoxide.

  • over 86% share of China's vanadium output from vanadium slag, 2024
  • 82,000 t China's vanadium output, 2025 estimate, of about 110,000 t world

This makes much of world vanadium supply depend on how much iron Chinese mills make from this ore, not on vanadium prices. Primary ores such as stone coal supply only about 6% of Chinese output, so a steel slump can cut vanadium supply and demand together.

Sources: USGS; Argus Media

3. Rebar standards set vanadium demand

Policy · Strong · Chinese rebar rules → vanadium use per tonne

Chinese national rebar standards fix the minimum strength grades mills may sell, and higher grades need more microalloying, so a change in the standard shifts vanadium demand across the world's largest steel market.

  • 1 November 2018 Chinese standard that dropped 335 MPa Grade 2 rebar took effect
  • 25 September 2024 mandatory GB 1499.2 rebar standard took effect

The 2018 change removed the lowest grade and pushed mills to higher-strength grades, which raised vanadium use. Even so, Argus expected Chinese steel-sector vanadium use to fall by about 2,800 t to 89,600 t in 2024, mainly because of lower rebar output, despite the higher intensity.

Sources: Engineering News (Creamer Media); Metalnomist; Argus Media

4. Niobium and other alloying elements

Substitution · Medium · Niobium, titanium and others can replace vanadium in steel

Manganese, molybdenum, niobium, titanium and tungsten can partly replace vanadium as alloying elements, so mills switch when vanadium is dear.

After the 2024 standard, some Chinese producers expected only limited extra vanadium demand because mills were adopting high-phosphorus ferro-niobium, vanadium-bearing pig iron and ferro-titanium instead. Substitution caps how far vanadium prices can rise on rebar demand alone.

Sources: USGS; Metalnomist

5. Vanadium prices follow the steel cycle

Cost and price · Strong · Steel market → vanadium price

With steel as the main use and, in China, the main source, vanadium prices track the health of the steel industry, especially in China.

  • $5.02/lb average Chinese V2O5 price, 2025 estimate
  • $5.44/lb average Chinese V2O5 price, 2024
  • 21,000 to 24,000 t Chinese vanadium use in flow batteries, 2024 forecast (Argus)

Flow batteries for grid storage are a growing second market that does not depend on steel, but in 2024 they were still about a fifth of Chinese vanadium use, against roughly three quarters for steel. Until that share grows, vanadium remains a steel-cycle metal.

Sources: USGS; Argus Media

For investors

Key learnings

  1. Vanadium demand is set by Chinese rebar output and the strength grades its standards require, so construction activity in China is the main demand signal.
  2. Most vanadium supply is a coproduct of Chinese ironmaking, so a steel downturn cuts supply as well as demand, which can soften price falls.
  3. Niobium and other alloying elements limit vanadium's upside, while flow batteries offer the only large demand source outside steel.

What to track

  • China rebar output: Main driver of vanadium demand (Monthly · National Bureau of Statistics of China)
  • Chinese V2O5 and ferrovanadium prices: Shows the steel-driven vanadium cycle and the cost of microalloying (Weekly · Asian Metal or Fastmarkets)
  • Vanadium flow battery installations: Growth of non-steel demand (Quarterly · industry and grid storage reports)

For policymakers

Key learnings

  1. Building standards that require stronger rebar raise vanadium or niobium demand, so standards policy is also critical-mineral policy.
  2. World vanadium supply is concentrated in China and tied to its ironmaking, which makes it hard for other countries to secure supply independently.
  3. Using steel slag as a vanadium source shows how by-product recovery from existing plants can add critical-mineral supply.

What to track

  • Rebar grade standards and adoption of higher grades: Changes vanadium intensity of construction steel (As revised · national standards bodies)
  • Share of world vanadium output from China: Supply concentration risk (Yearly · USGS Mineral Commodity Summaries)

Sources

  1. Mineral Commodity Summaries 2026: Vanadium, USGS (2026)
  2. Vanitec applauds new stricter Chinese rebar standard, Engineering News (Creamer Media) (2018)
  3. China's vanadium producers evaluate implications of new rebar standard, Metalnomist (2024)
  4. Q&A: China's vanadium oversupply to ease in 2025, Argus Media (2024)