Invar 36

UNS K93601 special
Validate composition

Fe-Ni controlled-expansion alloy with near-zero CTE at room temperature. Used in precision instruments, tooling master gauges, and LNG storage tank liners.

Applicable Standards

  • ASTM F1684
  • UNS K93601

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 63.0 65.0 ~64.0
Ni 35.0 37.0 ~36.0
Mn 0.2 0.6 ~0.4
C — 0.1 ~0.05
Si — 0.35 ~0.17
Fe 63.0–65.0% Ni 35.0–37.0% Mn 0.2–0.6% C 0.0–0.1% Si 0.0–0.35%

Typical Applications

  • Precision gauges
  • LNG tank liners
  • Geodetic tapes
  • Satellite structures
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