Monel 400

UNS N04400 nickel_superalloy
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Nickel-copper alloy with excellent corrosion resistance in seawater, hydrofluoric acid, and alkalis. Widely used in marine and chemical processing applications.

Applicable Standards

  • ASTM B127
  • ASTM B163
  • ASTM B164
  • AMS 4544

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Ni 63.0 70.0 ~66.5
Cu 28.0 34.0 ~31.0
Fe — 2.5 ~1.25
Mn — 2.0 ~1.0
C — 0.3 ~0.15
Si — 0.5 ~0.25
Ni 63.0–70.0% Cu 28.0–34.0% Fe 0.0–2.5% Mn 0.0–2.0% C 0.0–0.3% Si 0.0–0.5%

Typical Applications

  • Marine engineering
  • Chemical processing equipment
  • Hydrofluoric acid service
  • Valves and pump shafts
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