ASTM A182 F51 — Chemical Composition & Mechanical Properties
ASTM A182 F51 is a duplex stainless steel grade for forged flanges & fittings (UNS S31803, EN / W.Nr 1.4462). It is also known as 2205. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group manufactures flanges and fittings in this grade.
ASTM A182 F51 at a glance
| Specification | ASTM A182 F51 |
|---|---|
| Material family | Duplex stainless steel |
| Product form | Forged flanges & fittings |
| UNS number | S31803 |
| EN / W.Nr equivalent | 1.4462 |
| Also known as | 2205 |
| PREN (min values) | 30.5 |
| Document | TG-MG-011 · Rev. 1 · October 2026 |
Typical service
22Cr duplex — chloride / sour / offshore service
Heat treatment
Solution annealed at 1020 °C min, liquid quench
Chemical composition of ASTM A182 F51 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 620 MPa |
|---|---|
| Yield strength, min | 450 MPa |
| Elongation, min | 25 % |
| Hardness | Not specified |
About duplex stainless steel
Duplex stainless steels have a mixed microstructure of roughly half austenite and half ferrite. The result is about twice the yield strength of 316L, much better resistance to chloride stress-corrosion cracking, and pitting resistance (PREN 34–36) between 316L and the 6Mo grades.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of ASTM A182 F51
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A182 F51 · ASME SA-182 F51 |
| USA — UNS | S31803 |
| Europe — EN designation | X2CrNiMoN22-5-3 |
| Europe — W.Nr | 1.4462 |
| Japan — JIS | SUS329J3L |
| China — GB / NB | S22253 / S22053 (022Cr22Ni5Mo3N / 022Cr23Ni5Mo3N) |
| China — old GB designation | 00Cr22Ni5Mo3N |
| UK — BS (withdrawn) | 318S13 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Same alloy in other product forms
| Product form | Specification / grade |
|---|---|
| Wrought butt-weld fittings | ASTM A815 WPS31803 |
| Seamless & welded pipe | ASTM A790 UNS S31803 |
Other duplex stainless steel grades
Duplex stainless steel overviewStandards for ASTM A182 F51
All material standardsFAQ
ASTM A182 F51: common questions
What is the minimum yield strength of ASTM A182 F51?
450 MPa, with a minimum tensile strength of 620 MPa.
What is the carbon content of ASTM A182 F51?
0.030 max %.
What is the PREN of ASTM A182 F51?
About 31, calculated as Cr + 3.3Mo + 16N using the specification minimum values. Typical heats are a little higher.
What is the UNS number and EN equivalent of ASTM A182 F51?
UNS S31803; the nearest European designation is W.Nr 1.4462. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A182 F51 heat treated?
Solution annealed at 1020 °C min, liquid quench.
What is the Chinese (GB) equivalent of ASTM A182 F51?
The nearest Chinese equivalent is S22253 / S22053 (022Cr22Ni5Mo3N / 022Cr23Ni5Mo3N), formerly 00Cr22Ni5Mo3N. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A182 F51?
The nearest Japanese (JIS) equivalent is SUS329J3L.
Does Teshi Group supply ASTM A182 F51?
Teshi Group manufactures flanges and fittings in this grade. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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