Duplex || S31803 || S32205 || 1.4462 || F51

Special stainless steel

Duplex || 1.4462

The steel is characterised by the following properties:

  • Excellent resistance to pitting and crevice corrosion, PREN = ≥35
  • Higher strength than conventional austenitic stainless steels
  • Good weldability
  • High resistance to general corrosion
  • High resistance to acidic solutions
  • High resistance to stress corrosion

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 ≤ 0,03
S ≤ 0,020
Si ≤ 1,0
Mn ≤ 2,0
Cr 21 – 23
Mo 2,5 – 3,5
Ni 4,5 – 6,5
N 0,08 – 0,20

Mechanical values at room temperature

Tensile strength N/mm² 640 – 900
Tension elastic limit Rp 0,2 N/mm² ≥ 450
Breaking elongation A5 % 25

Assignment to current and older standards

  • Designation according to DIN: x2 Cr Ni Mo N 22-5
  • ASTM Grade: S 31803 / S 32205
  • EN: 1.4462
  • ASME: Duplex
  • AFNOR: X2CrNiMoN 22-5-3
  • SIS: 2377
  • UNS: S31803 / S32205
  • Vd TÜV 418: 1.4462

Tables and rates

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