Duplex Stainless Steel
Benefits of Duplex Stainless Steel
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Improved Strength
Many duplex grades are as much as two times stronger than austenitic and ferritic stainless steel grades.
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High Toughness and Ductility
Duplex stainless steel is often more formable under pressure than ferritic grades and provides greater toughness. Though they often offer lower values than austenitic steels, the unique structure and characteristics of duplex steel often outweigh any concerns.
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High Corrosion Resistance
Depending on the grade in question, duplex stainless steels offer comparable (or better) corrosion resistance as common austenitic grades. For alloys with increased nitrogen, molybdenum, and chromium, steels exhibit high resistance to both crevice corrosion and chloride pitting.
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Cost Effectiveness
Duplex stainless steel offers all of the above benefits while requiring lower levels of molybdenum and nickel. This means that it is a lower-cost option than many traditional austenitic grades of stainless steel. The price of duplex alloys is often less volatile than other steel grades, making it easier to estimate costs—both at an upfront and lifetime level. The higher strength and corrosion resistance also mean that many parts made using duplex stainless can be thinner than their austenitic counterparts, providing lower costs.
Duplex Stainless Steels—Ultimate Strength Meets Superior Corrosion Resistance
UNS S32750 / S32760 (2507) duplex stainless combines outstanding pitting resistance and mechanical strength. Designed for seawater, chemical, and high-pressure industrial systems.
Duplex stainless steels have a combination of two phases, ferrite and austenite, in approximately equal measure. This allows them to benefit from the advantages of both austenitic and ferritic stainless steels, leading to increased strength, improved weldability, higher toughness, and resistance to several types of corrosion. Commercially, they are also cheaper than austenitic stainless steels due to their lower nickel content.
Super duplex stainless steel is a high alloy dual-phase (ferritic-austenitic) material with:
- Twice the yield strength of 304/316
- Excellent resistance to pitting, crevice, and stress corrosion cracking (SCC)
- Designed for aggressive chloride-rich environments
- Good weldability and mechanical performance at high pressure
These steels are widely used when both strength and corrosion resistance are required, making them ideal for structural and process-critical systems.
| Grade | UNS No. | PREN | Main Feature |
|---|---|---|---|
| 2507 | S32750 | 42-45 | High strength + seawater & acid corrosion resistance |
| Zeron® 100 | S32760 | 45-50 | Higher impact resistance + erosion/corrosion resistance |
| F55 / 1.4501 | — | 45+ | Equivalent to S32760 |
| Grade | EN No./UNS | Type | Approx. Composition Cr | Ni | Mo |
|---|---|---|---|---|---|
| 2101 LDX | 1.4162 / S32101 | Lean | 21.5 | 1.5 | 0.3 |
| DX2202 / RDN 903 | 1.4062 / S32202 | Lean | 23 | 2.5 | 0.3 |
| 2304 | 1.4362 / S32304 | Lean | 23 | 4.8 | 0.3 |
| 2205 | 1.4462 / S31803 / S32205 | Standard | 22 | 5.7 | 3.1 |
| 2507 | 1.4410 / S32750 | Super | 25 | 7 | 4 |
| Zeron 100 | 1.4501 / S32760 | Super | 25 | 7 | 3.2 |
| Ferrinox | 1.4507 / — | Super | — | — | — |
| 255 / 255 | S32520 / — | Super | 25 | 6.5 | 3.5 |
| Uranus 2507Cu | S32550 | Super | — | — | — |
- Chemical processing: reactors, heat exchangers, scrubbers
- Waste treatment and desulfurization (FGD) systems
- Pharmaceutical and biotech plants
- Pulp & paper bleaching systems
- Offshore & marine environments
- Pickling line equipment and fertilizer plants
Processing & Packaging
- Full stock of Incoloy 800/825 pipe, sheet, bar & wire
- Cut-to-length, threading, CNC machining service
- Weldability guidance + filler suggestions (e.g., ERNiCrMo-3)
- Precision forging + solution annealing available
- Corrosion simulation & technical support
- Global supply network with fast dispatch
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