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.
| UNS Number | S31803 |
|---|---|
| EN / Werkstoff | 1.4462 (commonly associated) |
| Material Type | Duplex ferritic-austenitic stainless steel |
| Common / Applicable Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Duplex S31803 Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Carbon | C | 0.030 max. |
| Manganese | Mn | 2.00 max. |
| Silicon | Si | 1.00 max. |
| Phosphorus | P | 0.030 max. |
| Sulfur | S | 0.020 max. |
| Chromium | Cr | 21.00–23.00 |
| Nickel | Ni | 4.50–6.50 |
| Molybdenum | Mo | 2.50–3.50 |
| Nitrogen | N | 0.08–0.20 |
| Iron | Fe | Balance |
Duplex S31803 Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | 620 min. | MPa |
| 0.2% Offset Yield Strength | 450 min. | MPa |
| Elongation | 25 min. | % |
| Hardness | 293 max. | HBW |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Duplex S31803 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 7.8 g/cm³ |
|---|---|
| Structure | Duplex ferritic-austenitic |
| Relationship to S32205 | S32205 has tighter chemistry limits intended to assure minimum corrosion performance; many products are dual-certified. |
| Heat Treatment | Normally solution annealed and rapidly cooled. |
| Service Selection | Use certified chemistry and product specification when S31803 versus S32205 designation matters. |
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