General Description

Alloy 20 is a iron based nickel-chromium-molybdenum stainless steel developed to withstand sulfuric acid. The high nickel content combined with chromium, molybdenum and copper gives the alloy excellent resistance to intergranular corrosion and stress corrosion and good resistance to pitting and crevice corrosion.

Alloy 20 is used in wide applications up to temperatures of around 500℃. Such as equipments for the manufacturer of sulphuric acid and for processed based on sulphuric acid, production of plastics and synthetic fibers, and equipments for food processing to protect against contamination.

Chemical Composition

Grade Fe% Ni% Cr% Mo% Mn% Cu% Si% C% S% P% Cb+Ta%
Alloy 20 Bal. 32.5-35.0 19.0-21.0 2.0-3.0 Max 2.0 3.0-4.0 Max 1.0 Max 0.06 Max 0.035 Max 0.035 8*C-1.0


UNS N08020

Werkstoff Nr. 2.4660


Alloy 20 Bar: ASTM B473

Alloy 20 Forging: ASTM B462

Alloy 20 Sheet/Plate: ASTM B463

Alloy 20 Pipe/Tube: ASTM B729

Physical Properties

Density:8.0 g/cm3

Mechanical Properties

Solution Annealed

Tensile: Min 600 MPa

Yield: Min 320 MPa

Elongation: Min 35%

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