1.4410 || Super-Duplex || S32750 || F53

Special stainless steel

1.4410 || Super-Duplex || S32750 || F53

The steel is characterised by the following properties:

  • Excellent resistance to pitting and crevice corrosion, PREN = ≥38
  • Higher strength than conventional austenitic stainless steels
  • Good weldability
  • High resistance to general corrosion
  • High resistance to acidic solutions
  • High resistance to stress corrosion

SUPER-DUPLEX applications

  • Chemical industry
  • Petrochemical industry
  • Pulp / Paper industry
  • Sea and seawater plants
  • Flue gas systems
  • Shipbuilding / Offshore

Chemical values – Reference analysis (weight proportion in %)

Value Proportion %
C ≤ 0,03
P < 0,035
S ≤ 0,015
Si ≤ 1,0
Mn 1,0
Cr 24 – 26
Mo 3,5 – 5,0
Ni 6 – 8
N 0,24 – 0,32

Mechanical values at room temperature

Tensile strength N/mm² 800 – 1000
Tension elastic limit Rp 0,2 N/mm² 550
Breaking elongat ≤ 3 ≤ 75 mm Dicke A5 % 20

Assignment to current and older standards

  • Designation according to DIN: X 2 CrNiMoN 25-7-4
  • ASTM Grade: S 32750
  • EN: 1.4410
  • ASME: Superduplex
  • AFNOR: X2CrNiMoN 22-5-3
  • SIS: 2377
  • UNS: S 32750
  • Vd TÜV 508

Tables and rates

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