Alloy 20
Alloy 20 is a nickel-iron-chromium alloy containing molybdenum and copper. It was developed for resistance to sulfuric-acid service and is widely used where conventional stainless steels do not provide sufficient corrosion resistance.
Alloy 20 Information
Alloy 20 is a nickel-iron-chromium alloy containing molybdenum and copper. It was developed for resistance to sulfuric-acid service and is widely used where conventional stainless steels do not provide sufficient corrosion resistance.
Metallic winding and compatible ring components where service conditions are suitable.
| Material specification | ASTM B463 |
|---|---|
| Specified grade / UNS | Alloy 20 N08020 |
Alloy 20 Chemical Composition
ASTM B463 · Grade-specific requirements
| Element / requirement | Value |
|---|---|
| C % | ≤0.070 |
| Mn % | ≤2.0 |
| P % | ≤0.045 |
| S % | ≤0.035 |
| Si % | ≤1.0 |
| Ni % | 32.0–38.0 |
| Cr % | 19.0–21.0 |
| Mo % | 2.0–3.0 |
| Cu % | 3.0–4.0 |
| Nb + Ta % | 8 × C to 1.0 |
| Fe | Remainder |
Alloy 20 Mechanical Properties
ASTM B463 · Grade-specific requirements
| Product form / condition | Tensile min (MPa) | Yield min (MPa) | Elongation min (%) | Hardness |
|---|---|---|---|---|
| Plate / sheet / strip · Specified annealed condition | 551 | 241 | 30 | ≤217 HBW or ≤95 HRB |
| Thickness <0.015 in. (0.38 mm) · 1 in. gauge length | 551 | 241 | 20 | ≤217 HBW or ≤95 HRB |
ASTM B463 Grade Reference
Alloy 20 N08020
The chemical and mechanical tables on this page use the ASTM B463 requirements for this grade, including the product conditions listed in the standard overview.
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