Duplex & super duplex / UNS S32760
Zeron® 100 (UNS S32760, F55) is a super duplex stainless steel alloyed with copper and tungsten, offering PREN ≥ 40 and high strength for seawater, firewater and sour-service systems.
- UNS S32760
- W.Nr. 1.4501
- Spec ASTM A240
- Density 7.84 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S32760 |
| W.Nr. | 1.4501 |
| EN | X2CrNiMoCuWN25-7-4 |
| Also known as | F55, S32760, 1.4501 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.030 |
| Mn | — | 1.00 |
| P | — | 0.030 |
| S | — | 0.010 |
| Si | — | 1.00 |
| Cr | 24.0 | 26.0 |
| Ni | 6.0 | 8.0 |
| Mo | 3.0 | 4.0 |
| Cu | 0.50 | 1.00 |
| W | 0.50 | 1.00 |
| N | 0.20 | 0.30 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 750 MPa (108.8 ksi) |
| Yield strength, 0.2% offset (min) | 550 MPa (79.8 ksi) |
| Elongation in 50 mm (min) | 25 % |
| Hardness | 270 HB max |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.84 g/cm³ | 0.283 lb/in³ |
| Magnetic response | Magnetic (ferritic-austenitic) | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets, plates & coils | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Seamless & welded pipe | ASTM A790 / A928 | 1/8" – 24" NB |
| Tubes | ASTM A789 | 1/8" – 24" NB |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 / ASME SA182 (F51, F53, F55, F60, F61, F44) | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A815 | 1/2" – 48" NB |
Corrosion & temperature resistance
Duplex grades combine high strength with resistance to chloride pitting, crevice corrosion and stress-corrosion cracking; super duplex grades (PREN ≥ 40) are used for seawater and aggressive brines. Service is normally limited to about 250–300 °C because of embrittlement at higher temperatures.
Applications
Zeron® 100: Firewater, seawater, oil & gas piping. Offshore and subsea piping, desalination, chemical tankers, pulp bleaching, heat exchangers and pressure vessels where weight saving matters.
Zeron® 100 vs Super Duplex 2507
| Zeron® 100 | Super Duplex 2507 | |
|---|---|---|
| UNS | S32760 | S32750 |
| Key property | Cu + W super duplex | PREN > 40, seawater grade |
| Typical use | Firewater, seawater, oil & gas piping | Seawater systems, desalination, subsea |
| Cr (wt %) | 24.0–26.0 | 24.0–26.0 |
| Ni (wt %) | 6.0–8.0 | 6.0–8.0 |
| Mo (wt %) | 3.0–4.0 | 3.0–5.0 |
| C (wt %) | ≤ 0.030 | ≤ 0.030 |
| Tensile / yield (min, MPa) | 750 / 550 | 795 / 550 |
Frequently asked questions
What is the UNS number of Zeron® 100?
Zeron® 100 is designated UNS S32760 (W.Nr. 1.4501, EN X2CrNiMoCuWN25-7-4).
What is Zeron® 100 used for?
Cu + W super duplex. Typical uses: firewater, seawater, oil & gas piping.
Is Zeron® 100 magnetic?
Magnetic (ferritic-austenitic).
In which forms can I buy Zeron® 100 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Zeron® 100?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Zeron® 100 and Super Duplex 2507?
Zeron® 100: cu + w super duplex. Super Duplex 2507: pren > 40, seawater grade. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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