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Alloy 20

A nickel-iron-chromium grade, Alloy 20 is ideal for a wide range of corrosive environments.

With the addition of copper, molybdenum and niobium, Alloy 20 is the alloy of choice for sulphuric acid applications.


Product form Size range from Size range to
Alloy 20 sheet & plate 1.6 mm 76.2 mm
Alloy 20 round bar 10 mm 279.4 mm
Alloy 20 pipe 0.5 in 10 in
Alloy 20 pipe fittings 0.5 in 10 in
Alloy 20 flanges 0.5 in 10 in

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    Pipe Fittings

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    Sheet & Plate

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    Round Bar

Chemical Analysis

% Ni Cr Mo Mn Cu Si C S P Nb+Ta Fe
Min 32.5 19 2 - 3 - - - - 8.0 x C 1.0 -
Max 35 21 3 2 4 1 0.06 0.035 0.035 - Balance


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Perfect for applications in the Chemical Processing Industry

Alloy 20 can be used in a variety of applications including:

  • Sulphuric acid pickling tanks, racks and heating coils
  • Phosphate coating drums and racks
  • Heat exchangers
  • Process piping
  • Tanks
  • Pumps and valves
  • Gaskets
  • Mechanical seals
  • Process equipment for manufacture of bullet-proof fibre, Kevlar

About Alloy 20

Alloy 20 contains niobium for stabilization which enhances its corrosion resistance. The alloy is an iron-base, austenitic alloy with excellent corrosion resistance to a wide range of media.

With the high nickel content, Alloy 20 shows good resistance to chloride-induced stress corrosion cracking. In addition the alloy also has good resistance to pitting and crevice corrosion.

In the chemical process market, key applications of Alloy 20 are in sulphuric, phosphoric and nitric acid environments.

The alloy is also commonly used in the food industry for the manufacture of food preservatives (phosphorus oxychloride and phosphorus trichloride).


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7.695 g/cm³ annealed
Melting range:
Electrical resistivity:
1.08 x 10-6 Ω⋅m
Poisson's Ratio:


UNS Number:
Werkstoff Number:
ASTM A240, B463, B473, B366, B464, B468, B462, B729, B775
Download the Alloy 20 Data Sheet Download

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