Tantalum (unalloyed)

UNS R05200 special
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Quick answer

Tantalum (unalloyed) is a special specified by ASTM B365, UNS R05200. Typical composition: .

Pure tantalum with exceptional corrosion resistance to virtually all acids including HCl and H2SO4. Used in chemical reactors, capacitors, and medical implants.

Applicable Standards

  • ASTM B365
  • UNS R05200

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Ta 99.9 100.0 ~99.95
Nb — 0.1 ~0.05
Fe — 0.01 ~0.01
O — 0.015 ~0.01
Ta 99.9–100.0% Nb 0.0–0.1% Fe 0.0–0.01% O 0.0–0.015%

Typical Applications

  • Chemical reactor linings
  • Capacitors
  • Surgical implants
  • Heat exchangers

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