Alloy 20 (Carpenter 20)

UNS N08020 nickel_superalloy
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Fe-Ni-Cr-Mo-Cu alloy developed specifically for sulphuric acid service. Used extensively in chemical process equipment, pickling tanks, and pharmaceutical manufacturing.

Applicable Standards

  • ASTM B473
  • UNS N08020

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 32.0 100.0 ~66.0
Ni 32.0 38.0 ~35.0
Cr 19.0 21.0 ~20.0
Mo 2.0 3.0 ~2.5
Cu 3.0 4.0 ~3.5
Nb — 1.0 ~0.5
C — 0.07 ~0.04
Fe 32.0–100.0% Ni 32.0–38.0% Cr 19.0–21.0% Mo 2.0–3.0% Cu 3.0–4.0% Nb 0.0–1.0% C 0.0–0.07%

Typical Applications

  • Sulphuric acid tanks
  • Pickling equipment
  • Pharmaceutical vessels
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