Duplex S31803
UNS S31803 is an established duplex stainless steel grade with a ferritic-austenitic microstructure. It offers high strength and improved resistance to chloride stress-corrosion cracking compared with conventional 300-series stainless steels.
Duplex S31803 Information
UNS S31803 is an established duplex stainless steel grade with a ferritic-austenitic microstructure. It offers high strength and improved resistance to chloride stress-corrosion cracking compared with conventional 300-series stainless steels.
Metallic winding and compatible ring components where service conditions are suitable.
| Material specification | ASTM A240 |
|---|---|
| Specified grade / UNS | 2205 (S31803) S31803 |
Duplex S31803 Chemical Composition
ASTM A240 · Grade-specific requirements
| Element / requirement | Value |
|---|---|
| C % | ≤0.030 |
| Mn % | ≤2.00 |
| P % | ≤0.030 |
| S % | ≤0.020 |
| Si % | ≤1.00 |
| Cr % | 21.0–23.0 |
| Ni % | 4.5–6.5 |
| Mo % | 2.5–3.5 |
| N % | 0.08–0.20 |
| Cu % | - |
| Other elements | - |
Duplex S31803 Mechanical Properties
ASTM A240 · Grade-specific requirements
| Tensile min (MPa) | Yield min (MPa) | Elongation min (%) | Hardness max |
|---|---|---|---|
| 620 | 450 | 25 | ≤293 HBW |
ASTM A240 Grade Reference
2205 (S31803) S31803
The chemical and mechanical tables on this page use the ASTM A240 requirements for this grade, including the product conditions listed in the standard overview.
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