Tuesday, January 4, 2022

Nickel Alloy 20 (UNS N08020)

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.

ElementContent (%)
Iron, Fe35
Nickel, Ni32-38
Chromium, Cr19-21
Copper, Cu3-4
Manganese, Mn≤2
Molybdenum, Mo2-3
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.

PropertiesMetricImperial
Density8.05 g/cm30.291 lb/in3

Mechanical Properties

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

PropertiesMetricImperial
Tensile strength (annealed)620 MPa89900 psi
Yield strength (annealed)300 MPa43500 psi
Elongation at break (annealed)41%41%

Thermal Properties

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

PropertiesMetricImperial
Thermal expansion co-efficient (@20-100°C/68-212°F)14.7 µm/m°C8.17 µin/in°F
Thermal conductivity12.3 W/mK85.4 BTU.in/hrft².°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

Applications

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

This information has been sourced, reviewed and adapted from materials provided by wilsonpipeline Pipe Industry Co., Limited.

For more information on this source, please visit wilsonpipeline Pipe Industry Co., Limited.

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