Summary
Both grades are about half ferrite and half austenite. The higher alloy content of 2507 buys resistance to seawater and hot chlorides. For scrap, higher nickel and molybdenum make 2507 the more valuable of the two. Keep both away from nickel alloy lots.
Side by Side
| Duplex 2205 | Super duplex 2507 | |
|---|---|---|
| PREN | About 35 | Above 40 |
| UNS | S32205 / S31803 | S32750 |
| Typical service | Process piping, tanks, vessels | Seawater, offshore, desalination high-pressure |
| Forgings | A182 F51 / F60 | A182 F53 |
Composition Compared
Nominal compositions compared element by element. Change either grade to compare others.
On the XRF
Switch the grade to see how the fingerprint changes. See how XRF sorts nickel alloys.
FAQ
What is the main difference between Duplex 2205 and super duplex 2507?
Super duplex 2507 carries more chromium (25% against 22.5%), molybdenum (4% against 3.1%), nickel (7% against 5.5%) and nitrogen than duplex 2205, giving a PREN above 40 against about 35. Both are magnetic, so XRF is needed to tell them apart.
Can Duplex 2205 and Super duplex 2507 scrap be mixed?
No. Keep them separate. A melter buying either one needs its chemistry to stay within the grade’s limits, and mixing can mean a re-sort or a different valuation.