Nickel Alloy 20 (UNS N08020)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Nickel alloy 20 is a low-carbon, niobium-stabilized austenitic nickel/iron/chromium alloy with additions of molybdenum and copper. It exhibits exceptional corrosion resistance in chemical environments containing phosphoric acid, nitric acid, chlorides and sulfuric acid. It also has good mechanical properties at both ambient and elevated temperatures.

The following sections will discuss in detail about nickel alloy 20.

Chemical Composition

The chemical composition nickel alloy 20 is outlined in the following table.

Element Content (%)
Iron, Fe 35
Nickel, Ni 32-38
Chromium, Cr 19-21
Copper, Cu 3-4
Manganese, Mn ≤2
Molybdenum, Mo 2-3
Niobium, Nb ≤1
Silicon, Si ≤1
Carbon, C ≤0.07
Phosphorous, P ≤0.045
Sulfur, S ≤0.035

Physical Properties

The following table shows the physical properties of nickel alloy 20.

Properties Metric Imperial
Density 8.05 g/cm3 0.291 lb/in3

Mechanical Properties

The mechanical properties of nickel alloy 20 are displayed in the following table.

Properties Metric Imperial
Tensile strength (annealed) 620 MPa 89900 psi
Yield strength (annealed) 300 MPa 43500 psi
Elongation at break (annealed) 41% 41%

Thermal Properties

The thermal properties of nickel alloy 20 are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 14.7 µm/m°C 8.17 µin/in°F
Thermal conductivity 12.3 W/mK 85.4².°F

Other Designations

Other designations that are equivalent to nickel alloy 20 include the following:

  • ASME SB-462 - SB-464
  • ASME SB-468
  • ASTM B 462 - B 464
  • ASTM B 468
  • ASTM B 472 - B 474
  • ASTM B 751


The following are the list of applications of nickel 205 alloy:

  • Production of plastics and synthetic fibers
  • Chemical and petroleum processing equipment
  • Mixing tanks
  • Heat exchangers
  • Process piping

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