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Alloy 20

Alloy 20 is a austenitic nickel-iron-chromium alloy developed for maximum resistance against acid attack, specially sulfuric acid. It offers excellent resistance to pitting, crevice corrosion and general corrosion in chemicals containing chlorides and sulfuric, nitric , phosphoric and acids.For stabilization against sensitization and resultant intergranular corrosion Alloy 20 contains niobium. With relatively easy fabrication and elevated mechanical properties Alloy 20 also provides excellent corrosion resistance.

Specifications

Standard Alloy 20
1 UNS N08020
2 Werkstoff Nr. 2.4660

Chemical Composition

Alloy 20
Ni 32 – 38
Fe Bal
Cr 19 – 21
Cu 3 – 4
Mo 2 – 3
Cr 1.0 max
Nb 0.1 – 0.3
C 0.02 max
Mn 0.04 max
S 1 – 2
P 0.02 max
S 0.005 max
Si 0.7 max

Mechanical & Physical Properties

Density 8.1 g/cm3
Melting Point 1443 °C (2430 °F)
Tensile Strength Psi – 80000 , MPa – 551
Yield Strength (0.2%Offset) Psi – 35000 , MPa – 241
Elongation 30 %