Alloy 20 · ISO 6208
Alloy 20 is presented here as FeNi35Cr20Cu4Mo2 (NW8020) under ISO 6208. Nickel and wrought nickel-alloy plate, sheet and strip, with composition and condition-specific tensile requirements.
FeNi35Cr20Cu4Mo2
Designation: NW8020
Data edition: ISO 6208:1992
Alloy 20 NW8020
Alloy 20 is presented here as FeNi35Cr20Cu4Mo2 (NW8020) under ISO 6208. Nickel and wrought nickel-alloy plate, sheet and strip, with composition and condition-specific tensile requirements.
Historical edition: ISO 6208:1992 is withdrawn. Tables 1 and 2 of the supplied ISO 6208:1992 document. Selected annealed, as-rolled and precipitation-treated conditions are shown. Inconel 602CA is not represented by NW6002; NW6002 is a different alloy.
Related grades
14 material references with ISO 6208 data.
Alloy 20 properties
Select a table to compare requirements.
| Element | Mass % |
|---|---|
| C | ≤0.07 |
| Si | ≤1.0 |
| Mn | ≤2.0 |
| P | ≤0.040 |
| S | ≤0.030 |
| Cr | 19.0–21.0 |
| Ni | 32.0–38.0 |
| Mo | 2.0–3.0 |
| Fe | Balance |
| Cu | 3.0–4.0 |
| Other elements | Nb + Ta: 8 × C to 1.0 |
Composition in mass %. ≤ denotes a maximum; ≥ denotes a minimum; paired values are ranges. — means no numerical limit is provided in the cited data, not zero. When no cobalt limit is specified, up to 1.5% cobalt may be counted as nickel under Table 1 footnote 4.
| Condition | Thickness (mm) | Rp0.2 min (MPa) | Rm (MPa) | A5 / A50 min (%) | Other requirements |
|---|---|---|---|---|---|
| Annealed | All | 275 | ≥590 | 30 | — |
Strength is in MPa. Proof stress does not apply below 0.5 mm thickness; elongation does not apply below 0.25 mm. Elongation uses either a proportional gauge length of 5.65√S₀ or a fixed 50 mm gauge length. — indicates no numerical value in the selected row.
Specification source
Technical data above is identified by its source edition: ISO 6208:1992.