Super Duplex 2507® Stainless Steel Bar

UNS S32750

UNS S32750, commonly known as Super Duplex 2507®, is very similar to UNS S31803 Duplex. The difference between the two is the contents of chromium and nitrogen are higher in the Super Duplex Grade which in turn creates higher corrosion resistance as well as a longer lifespan. Super Duplex is composed of between 24% to 26% chromium, 6% to 8% nickel, 3% molybdenum, and 1.2% manganese, with the balance being iron. Also found in Super Duplex are trace amounts of carbon, phosphorus, sulfur, silicon, nitrogen, and copper. Benefits include: good weldability and workability, a high level of thermal conductivity and low coefficient of thermal expansion, high resistance to corrosion, fatigue, high resistance to pitting and crevice corrosion, high resistance to stress corrosion cracking (especially chloride stress corrosion cracking), high energy absorption, high strength, and erosion. Essentially, the Duplex alloys are a compromise; possessing some of the ferritic stress corrosion cracking resistance and much of the superior formability of the common austenitic stainless alloys, more cost effectively than the high nickel alloys.

Industries that use Super Duplex include:

  • Chemical
  • Marine
  • Oil and Gas production
  • Petrochemical
  • Power
  • Pulp and Paper
  • Water desalinization

Products partially or completely constructed of Super Duplex include:

  • Cargo tanks
  • Fans
  • Fittings
  • Heat exchangers
  • Hot water tanks
  • Hydraulic piping
  • Lifting and pulley equipment
  • Propellers
  • Rotors
  • Shafts
  • Spiral wound gaskets
  • Storage vessels
  • Water heaters
  • Wire
Stocking Diameters 1/2” to 12”
Material Lengths Up to 12’
Bar Specifications
Uns Type Ams Astm Federal Characteristics
S32750 SUPER DUPLEX – A-479 – Higher chromium and nitrogen content in Super Duplex makes it superior in corrosion resistance and enables a longer lifespan than Duplex.
Chemistry Analysis
C MN P S SI CR NI MO CU OTHER M/NM
.03 1.2 .035 .02 .08 24. – 26. 6. – 8. 3. – 5. .5 N .24 – .32 INQUIRE

2507® is a trademark of Sandvik Steel and is sold only through authorized distributors.
The information above is not warranted, guaranteed, or for design purposes.

The information above is not warranted, guaranteed, or for design purposes.

Get the right answers right away!Get the right answers right away! People make the difference at National Specialty Alloys, Inc. With our in-depth product knowledge and extensive cross training, the National Specialty Alloys, Inc. sales and support staff are motivated to deliver fast, accurate information - first call, every call.

ISO 9001:2015 ABS QE Certificate of Compliance (32115) since 1996