Duplex Stainless Steel S31803 Seamless Pipes & Tubes Manufacturer & Supplier
Duplex S31803 is the earlier designation that overlaps with S32205. S31803 has a slightly wider composition range and may have a lower minimum PREN than S32205. Many existing specifications still reference S31803, though S32205 is now the preferred designation for new projects.
UNS: S31803 | Category: Duplex Stainless Steel | Werkstoff Nr: 1.4462 | EN Name: X2CrNiMoN22-5-3
Duplex S31803 — Also Known As
Duplex S31803 is also commonly known as Duplex S31803, Duplex Stainless Steel S31803 Seamless Pipes & Tubes, S31803, UNS S31803, 1.4462, Werkstoff 1.4462, W.Nr 1.4462, X2CrNiMoN22-5-3, 2205, duplex 2205, ur 45n.
Duplex S31803 — Applicable Standards & Specifications
Duplex S31803 is commonly supplied to ASTM A789, ASTM A790, ASME SA789, ASME SA790, EN 10216-5, EN 10217-7.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 160
Chemical Composition (%)
| C | Mn | Si | Cr | Ni | Mo | N | P | S |
|---|---|---|---|---|---|---|---|---|
| 0.030 max | 2.00 max | 1.00 max | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 | 0.030 max | 0.020 max |
Mechanical Properties
- Tensile Strength
- 620 MPa min
- Yield Strength
- 450 MPa min
- Elongation
- 25% min
- Hardness
- 293 HBW max
Physical Properties
- Density
- 7.82 g/cm3
- Melting Range
- 1350-1400 C
- Thermal Conductivity
- 19 W/m-K
- Electrical Resistivity
- 850 nOhm-m
- Specific Heat
- 480 J/kg-K
- Coeff. of Thermal Expansion
- 13.0 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~33
- Max Service Temp (Oxidizing)
- 315 C
- Intergranular Corrosion
- Highly resistant
- Stress Corrosion Cracking
- Excellent resistance
- General Corrosion Rate
- <0.02 mm/yr in most environments
- Seawater Resistance
- Excellent up to 20C
Applicable Standards
- ASTM A789 / ASME SA789
- ASTM A790 / ASME SA790
- NORSOK MDS D45
- DIN EN 10216-5
Applications
- Process piping in chemical plants
- Oil & gas production tubing
- Heat exchangers
- Pressure vessels
- Structural applications
- Transport tankers for chemicals
Industries Served
- Oil & Gas
- Chemical Processing
- Marine
- Desalination
- Power Generation
Key Advantages
- Dual-phase microstructure for high strength
- Excellent resistance to chloride SCC
- Good weldability with proper procedures
- Cost-effective compared to super duplex
- Proven track record in offshore service
Equivalent Grades
- ASTM
- S31803
- NORSOK
- MDS D45
- Trade
- 2205/S31803