Duplex 2205 (F51 / F60) Flanges
Teshi Group manufactures Duplex 2205 (F51 / F60) flanges (ASTM A182 F51 / F60, UNS S31803 / S32205, 1.4462) as an OEM in India — forged, machined, marked and certified in-house to ASME B16.5, ASME B16.47, EN 1092-1 and customer drawings.
Duplex 2205 has a balanced austenite–ferrite structure that gives roughly twice the yield strength of 316L, with much better resistance to chloride stress corrosion cracking and pitting.
Duplex 2205 (F51 / F60) flanges at a glance
| Material | Duplex 2205 (F51 / F60) |
|---|---|
| Specification | ASTM A182 F51 / ASTM A182 F60 |
| UNS / W.Nr. | S31803 / 1.4462 · S32205 / 1.4462 |
| Sizes | NPS ½"–24" (ASME B16.5), 26"–60" (ASME B16.47 A / B), DN 10–600 (EN 1092-1) |
| Pressure class | Class 150, 300, 600, 900, 1500, 2500 · PN 6–40 |
| Facing / ends | RF, FF, RTJ, tongue & groove, male-female; serrated or smooth finish |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
Duplex 2205 (F51 / F60) chemistry and mechanical properties
Chemical composition of Duplex 2205 (F51 / F60) (weight %, maximum unless a range)
| Grade | C | Mn | Si | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|
| 2205 (S31803) | 0.030 | 2.00 | 1.00 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
| 2205 (S32205) | 0.030 | 2.00 | 1.00 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
Mechanical properties of Duplex 2205 (F51 / F60) (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| 2205 (S31803) | 620 MPa (90 ksi) | 450 MPa (65 ksi) | 25 % | PREN ≈ 33 |
| 2205 (S32205) | 655 MPa (95 ksi) | 450 MPa (65 ksi) | 25 % | PREN ≈ 35 |
Matching specifications by product form
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| 2205 (S31803)UNS S31803 · W.Nr. 1.4462 | ASTM A182 F51 | ASTM A815 WPS31803 | ASTM A240 | ASTM A790 |
| 2205 (S32205)UNS S32205 · W.Nr. 1.4462 | ASTM A182 F60 | ASTM A815 WPS32205 | ASTM A240 | ASTM A790 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Duplex flanges are rated under ASME B16.5 material group 2.8. The applicable rating table is issued with every quotation, and flanges are marked with class, material and heat number.
Types we manufacture
Dimension charts
Where Duplex 2205 (F51 / F60) is used
- Brackish and produced-water lines
- Chemical process piping and vessels
- Oil and gas gathering and flow lines
- Pulp and paper digesters
- Hydrometallurgical leach circuits
Testing & certification
- Solution annealed and water quenched
- Ferrite content check, typically 35–65 %
- ASTM A923 tests for detrimental intermetallic phases when specified
- Impact testing and PMI as specified
FAQ
Duplex 2205 (F51 / F60) flanges: common questions
What specification covers Duplex 2205 (F51 / F60) flanges?
Duplex 2205 (F51 / F60) flanges are forged to ASTM A182 F51 / ASTM A182 F60 and dimensioned to ASME B16.5, ASME B16.47 or EN 1092-1.
What is the chemical composition of 2205 (S31803)?
2205 (S31803) (UNS S31803): C 0.030, Mn 2.00, Si 1.00, Cr 21.0–23.0, Ni 4.5–6.5, Mo 2.5–3.5, N 0.08–0.20 (weight %; single values are maximums).
What are the minimum mechanical properties of 2205 (S31803)?
Tensile strength 620 MPa (90 ksi), yield strength 450 MPa (65 ksi), elongation 25 %.
Is Teshi Group a manufacturer of Duplex 2205 (F51 / F60) flanges in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every Duplex 2205 (F51 / F60) piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
What is the difference between F51 and F60?
Both are duplex 2205. F51 is UNS S31803 (Cr 21–23 %, Mo 2.5–3.5 %); F60 is UNS S32205 with tighter, higher limits (Cr 22–23 %, Mo 3.0–3.5 %, N 0.14–0.20 %). Most 2205 today is dual-certified to both.
How strong is duplex 2205 compared with 316L?
Minimum yield strength is 450 MPa for duplex 2205 against 170 MPa for 316L forgings, which allows thinner, lighter components for the same pressure.
Ready to build to spec?
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