ASTM A790 UNS S32760 — Chemical Composition & Mechanical Properties
ASTM A790 UNS S32760 is a super duplex stainless steel grade for seamless & welded pipe (UNS S32760, EN / W.Nr 1.4501). It is also known as Zeron 100 (trade name). 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 S32760 at a glance
| Specification | ASTM A790 UNS S32760 |
|---|---|
| Material family | Super duplex stainless steel |
| Product form | Seamless & welded pipe |
| UNS number | S32760 |
| EN / W.Nr equivalent | 1.4501 |
| Also known as | Zeron 100 (trade name) |
| PREN (min values) | 37.9 |
| Document | TG-MG-082 · Rev. 1 · October 2026 |
Typical service
Super duplex seawater and firewater piping
Heat treatment
Solution annealed 1100–1140 °C, rapid cool
Chemical composition of ASTM A790 UNS S32760 (weight %)
Other elements and limits: W 0.50–1.00; PREN (Cr+3.3Mo+16N) 40 min
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 750 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 550 MPa |
| Elongation, min | 25 % |
| 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 S32760
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — ASTM / ASME | ASTM A790 UNS S32760 · ASME SA-790 UNS S32760 |
| USA — UNS | S32760 |
| Europe — EN designation | X2CrNiMoCuWN25-7-4 |
| Europe — W.Nr | 1.4501 |
| China — GB / NB | S27603 (022Cr25Ni7Mo4WCuN) |
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 F55 (Super Duplex S32760) |
| Wrought butt-weld fittings | ASTM A815 WPS32760 |
Standards for ASTM A790 UNS S32760
All material standardsFAQ
ASTM A790 UNS S32760: common questions
What is the minimum yield strength of ASTM A790 UNS S32760?
550 MPa, with a minimum tensile strength of 750 MPa.
What is the carbon content of ASTM A790 UNS S32760?
0.030 max %.
What is the PREN of ASTM A790 UNS S32760?
About 38, calculated as Cr + 3.3Mo + 16N (+ 1.65W) using the specification minimum values. Typical heats are a little higher.
What is the UNS number and EN equivalent of ASTM A790 UNS S32760?
UNS S32760; the nearest European designation is W.Nr 1.4501. Equivalents are close but not identical — check the specification if substituting.
How is ASTM A790 UNS S32760 heat treated?
Solution annealed 1100–1140 °C, rapid cool.
What is the Chinese (GB) equivalent of ASTM A790 UNS S32760?
The nearest Chinese equivalent is S27603 (022Cr25Ni7Mo4WCuN). Equivalents are close but not identical — compare chemistry and properties before substituting.
Does Teshi Group supply ASTM A790 UNS S32760?
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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