ASTM A790 UNS S32750 — Chemical Composition & Mechanical Properties
ASTM A790 UNS S32750 is a super duplex stainless steel grade for seamless & welded pipe (UNS S32750, EN / W.Nr 1.4410). It is also known as 2507. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings.
ASTM A790 UNS S32750 at a glance
| Specification | ASTM A790 UNS S32750 |
|---|---|
| Material family | Super duplex stainless steel |
| Product form | Seamless & welded pipe |
| UNS number | S32750 |
| EN / W.Nr equivalent | 1.4410 |
| Also known as | 2507 |
| PREN (min values) | 37.7 |
| Document | TG-MG-081 · Rev. 1 · October 2026 |
Typical service
Super duplex seawater and process piping
Heat treatment
Solution annealed 1025–1125 °C, rapid cool
Chemical composition of ASTM A790 UNS S32750 (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 800 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 550 MPa |
| Elongation, min | 15 % |
| Hardness | 300 HBW max |
About super duplex stainless steel
Super duplex stainless steels raise chromium to 25 %, molybdenum to 3.5–4 % and nitrogen to about 0.25 %, giving a PREN above 40. That makes them resistant to pitting and crevice corrosion in warm seawater, while keeping a minimum yield of 550 MPa.
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 A790 UNS S32750
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A790 UNS S32750 · ASME SA-790 UNS S32750 |
| USA — UNS | S32750 |
| Europe — EN designation | X2CrNiMoN25-7-4 |
| Europe — W.Nr | 1.4410 |
| Japan — JIS | SUS327L1 |
| China — GB / NB | S25073 (022Cr25Ni7Mo4N) |
| China — old GB designation | 00Cr25Ni7Mo4N |
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 |
|---|---|
| Forged flanges & fittings | ASTM A182 F53 (Super Duplex 2507) |
| Wrought butt-weld fittings | ASTM A815 WPS32750 |
Standards for ASTM A790 UNS S32750
All material standardsFAQ
ASTM A790 UNS S32750: common questions
What is the minimum yield strength of ASTM A790 UNS S32750?
550 MPa, with a minimum tensile strength of 800 MPa.
What is the carbon content of ASTM A790 UNS S32750?
0.030 max %.
What is the PREN of ASTM A790 UNS S32750?
About 38, 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 A790 UNS S32750?
UNS S32750; the nearest European designation is W.Nr 1.4410. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A790 UNS S32750 heat treated?
Solution annealed 1025–1125 °C, rapid cool.
What is the Chinese (GB) equivalent of ASTM A790 UNS S32750?
The nearest Chinese equivalent is S25073 (022Cr25Ni7Mo4N), formerly 00Cr25Ni7Mo4N. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of ASTM A790 UNS S32750?
The nearest Japanese (JIS) equivalent is SUS327L1.
Does Teshi Group supply ASTM A790 UNS S32750?
Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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