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, Fe35Nickel, Ni32-38Chromium, Cr19-21Copper, Cu3-4Manganese, Mn≤2Molybdenum, Mo2-3Niobium, Nb≤1Silicon, Si≤1Carbon, C≤0.07Phosphorous, P≤0.045Sulfur, S≤0.035

Physical Properties

The following table shows the physical properties of nickel alloy 20.PropertiesMetricImperialDensity8.05 g/cm30.291 lb/in3

Mechanical Properties

The mechanical properties of nickel alloy 20 are displayed in the following table.PropertiesMetricImperialTensile strength (annealed)620 MPa89900 psiYield strength (annealed)300 MPa43500 psiElongation at break (annealed)41%41%

Thermal Properties

The thermal properties of nickel alloy 20 are given in the following tablePropertiesMetricImperialThermal expansion co-efficient (@20-100°C/68-212°F)14.7 µm/m°C8.17 µin/in°FThermal conductivity12.3 W/mK85.4 BTU.in/hrft².°F

Other Designations

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

1. ASME SB-462 – SB-464

2. ASME SB-468

3. ASTM B 462 – B 464

4. ASTM B 468

5. ASTM B 472 – B 474

6. ASTM B 751

Applications

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

1. Alloy 20 cap fitting

2. Chemical and petroleum processing equipment

3. Mixing tanks

4. Heat exchangers

5. Special steel alloy 20 flanges

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

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