GRADE GUIDE · 2507
Super duplex 2507 stainless steel off-cuts
Super duplex 2507 (UNS S32750, EN 1.4410) steps duplex chemistry up to 25% chromium, 7% nickel and 4% molybdenum, pushing the pitting resistance number past 40 — the threshold for raw seawater service. With a 550 MPa yield floor, it is the grade of offshore piping, seawater lift systems and the harshest desalination duty.
Also listed as: UNS S32750 · EN 1.4410 · S32760 / Zeron 100 (sibling)
Live 2507 stock
Illustrative render2507 · Plate
Super duplex · cut_piece
3 × 1500 × 2650 mm · 93.02 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Plate
Super duplex · cut_piece
5 × 1500 × 3380 mm · 197.73 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Plate
Super duplex · cut_piece
12 × 1640 × 2000 mm · 307.01 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Plate
Super duplex · cut_piece
30 × 1250 × 1550 mm · 453.38 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 88.9 × 3.05 × 2200 mm · 14.12 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 406.4 × 4.78 × 2700 mm · 127.01 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 33.4 × 4.55 × 3220 mm · 10.36 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 88.9 × 7.62 × 1740 mm · 26.41 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 114.3 × 3.05 × 2000 mm · 16.63 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Illustrative render2507 · Pipe
Super duplex · balance_piece
OD 88.9 × 7.62 × 2360 mm · 35.82 kg
Excess Project Material
Dubai · Origin No · 1 pcs · Listed 14 Aug 2026
Price on requestAsk us on WhatsApp
Subject to Prior Sale and Final Availability Confirmation.
PREN ≥ 40 is the practical dividing line: below it, warm seawater eventually pits; at or above it, alloys handle raw, chlorinated seawater as a design condition. 2507 crosses that line while carrying the highest strength of any stainless family here — offshore operators specify it for firewater rings, injection lines and subsea hardware precisely because it removes chloride corrosion from the worry list.
The same chemistry that resists pitting makes the alloy unforgiving of bad heat treatment — intermetallic phases form fast in the 700–900 °C window, so welding procedures are strict and service stays below roughly 250 °C. Off-cuts also appear certified S32760 (Zeron 100), the sibling super duplex with tungsten and copper additions; check each listing's certificate. Surplus prices matter double here — full-length super duplex is among the most expensive stainless stock in the region.
Common questions
What separates super duplex 2507 from duplex 2205?
Alloying and the numbers it buys: PREN climbs from ≈35 to ≥40 (raw seawater capability) and yield from 450 to 550 MPa. For chlorinated or stagnant seawater, 2507 is the safe call; for brine and general chloride duty, 2205 usually suffices.
Are S32750 and S32760 interchangeable?
They are sibling super duplexes with equivalent PREN and strength; S32760 (Zeron 100) adds tungsten and copper. Many specifications accept either, but where a project names one UNS number, match the certificate exactly.
Why is heat input so critical when welding 2507?
Held in the 700–900 °C range, the alloy precipitates sigma phase, which destroys toughness and corrosion resistance. Qualified procedures with controlled heat input and interpass temperature are mandatory, not best practice.