UNS S32750 SuperDuplex Stainless Steel

SuperDuplex stainless like Duplex, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Superduplex has a higher Molybdenum and Chromium content which gives the material greater corrosion resistance.

SuperDuplex has the same benefits as its counterpart – it has lower production costs when compared with similar ferritic and austenitic grades and due to the materials increased tensile and yield strength, in many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.


Benefits of UNS32750 SuperDuplex Stainless Steel

  • Improved corrosion resistance in comparison to Duplex
  • Greater tensile and yield strength
  • Good ductility and toughness
  • Good stress corrosion cracking resistance (SSC)
  • Opportunity for purchases to reduce their material costs without compromising on quality


SuperDuplex is used in the oil and gas industry, on offshore platforms, in heat exchangers, chemical processing equipment pressure vessels and boilers.


About UNS32750

2507 is the most common SuperDuplex alloy which contains 24% chromium and a minimum of 3% molybdenum. Please refer to the chemical composition and mechanic properties tables below. For information on Duplex alloy please click here.

Mechanical Properties of S32750

Description Duplex 2205
Proof Stress 0.2% (MPa) 450
Tensile strength (MPa) 620
Elongation A5 (%) 20
Hardness HB: 293
HRB: 96 (according to Rockwell C Scale)

Chemical Composition of S32750

UNS No S32750
EN 1.4410
AISI 2507
Carbon (C) 0.030
Silicon (Si) 0.80
Manganese (Mn) 1.20
Phosphorus (P) 0.035
Sulphur (S) 0.020
Chromium (Cr) 24.0/26.0
Molybdenum (Mo) 3.0/3.5
Nickel (Ni) 6.00/8.00
Nitrogen (N) 0.24/0.32
Other Cu: 0.50