Duplex 2205 (UNS S32205) Seamless Pipes & Tubes Manufacturer & Supplier
Duplex 2205 (UNS S32205) is the world's most widely used duplex stainless steel, with a balanced microstructure of approximately 50% ferrite and 50% austenite. It offers nearly double the yield strength of standard austenitic grades with superior corrosion resistance.
UNS: S32205 | Category: Duplex Stainless Steel | Werkstoff Nr: 1.4462 | EN Name: X2CrNiMoN22-5-3
Duplex 2205 — Also Known As
Duplex 2205 is also commonly known as Duplex 2205, 2205 Duplex, Duplex 2205 (UNS S32205) Seamless Pipes & Tubes, S32205, UNS S32205, 1.4462, Werkstoff 1.4462, W.Nr 1.4462, X2CrNiMoN22-5-3, 2205, f60, alloy 2205.
Duplex 2205 — Applicable Standards & Specifications
Duplex 2205 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 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 0.030 max | 0.020 max |
Mechanical Properties
- Tensile Strength
- 655 MPa min
- Yield Strength
- 450 MPa min
- Elongation
- 25% min
- Hardness
- 31 HRC 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)
- ~35
- Max Service Temp (Oxidizing)
- 315 C (to avoid 475C embrittlement)
- Intergranular Corrosion
- Highly resistant
- Stress Corrosion Cracking
- Excellent resistance vs austenitic
- 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
- Offshore oil & gas platforms
- Chemical process vessels and piping
- Heat exchangers in aggressive media
- Desalination plants
- Structural marine applications
- Pulp & paper digesters
Industries Served
- Oil & Gas
- Chemical Processing
- Marine
- Desalination
- Pulp & Paper
Key Advantages
- Nearly double the yield strength of 316L
- Excellent chloride SCC resistance
- Outstanding pitting and crevice corrosion resistance
- NORSOK approved for offshore applications
- Lower nickel content = more stable pricing
- Excellent fatigue resistance
Equivalent Grades
- ASTM
- S32205/S31803
- NORSOK
- MDS D45
- Trade
- SAF 2205
Frequently Asked Questions
Duplex 2205 seamless pipes manufacturer — what should buyers know?
A Duplex 2205 seamless pipes manufacturer supplies UNS S32205/S31803 pipe and tube made to ASTM A790/A928 and ASME SA790, typically in NPS 1/8 to 8 in. with SCH 10 to SCH XXS or OD 6 mm to 219.1 mm. Material is solution annealed, pickled, and tested to ASTM A999 with PMI, hydro, and NDT.
What specifications should a Duplex 2205 seamless pipe manufacturer meet?
For Duplex 2205 seamless pipe, buyers usually look for ASTM A790 or ASME SA790 for ferritic-austenitic stainless steel pipe, with general requirements to ASTM A999. The grade is commonly listed as UNS S32205 or dual-certified S31803/S32205. Test reports typically include chemistry, mechanical properties, hydrostatic or NDT results, and heat treatment condition.
What sizes and tolerances are typical for Duplex 2205 seamless pipes and tubes?
Typical manufacturer supply covers small-bore and process sizes from about 6 mm OD up to 219.1 mm OD, or NPS 1/8 to 8 inches, in schedules such as SCH 10 through SCH XXS. Dimensional tolerances generally follow the governing ASTM/ASME specification for OD, wall thickness, length, and straightness, with cut lengths or random lengths available.
What standards and specifications apply to Duplex 2205 seamless pipes and tubes?
Duplex 2205 seamless pipes are commonly produced to ASTM A790, while seamless tubes are typically supplied to ASTM A789. The material is identified as UNS S32205 or UNS S31803, equivalent to EN/W.Nr. 1.4462. Buyers usually specify OD, wall thickness or schedule, length, finish, testing, and certification such as EN 10204 3.1.
Why is Duplex 2205 chosen over 316 stainless for seamless pipe applications?
Duplex 2205 is selected when higher strength and better resistance to chloride pitting and stress corrosion cracking are needed than 316/316L can provide. Its duplex microstructure gives higher yield strength, allowing pressure-bearing service in offshore, marine, chemical processing, desalination, and heat-exchanger systems where corrosion performance and mechanical strength both matter.
What sizes and wall thicknesses are available in Duplex 2205 seamless pipes and tubes?
Duplex 2205 seamless pipes are commonly supplied from 1/8 inch to 12 inch nominal bore in schedules such as SCH 10, SCH 40, SCH 80, SCH 160, and XXS. Seamless tubes are typically available from 6 mm to 219.1 mm outside diameter with standard wall thickness tolerances as per ASTM and ASME dimensional requirements.
What specifications should a Duplex 2205 seamless pipe manufacturer provide?
A reliable Duplex 2205 seamless pipe manufacturer should state the grade as UNS S32205 or S31803 and supply to ASTM A790 or ASME SA790 for seamless pipe/tube. Buyers should also ask for size range, schedule or wall thickness, ASTM A999 dimensional tolerances, heat treatment condition, NDT, hydrotest, PMI, and mill test certificates.
Where are Duplex 2205 seamless pipes used?
Duplex 2205 seamless pipes are used in seawater handling, offshore systems, heat exchangers, chemical processing, desalination, pulp and paper, and oil and gas service. The grade is chosen where higher mechanical strength than austenitic stainless steel and better resistance to chloride pitting, crevice corrosion, and stress corrosion cracking are required.