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 | 85.4 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:
- Alloy 20 cap fitting
- Chemical and petroleum processing equipment
- Mixing tanks
- Heat exchangers
- Special steel alloy 20 flanges
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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