254 SMO || 1.4547 || F44

Special stainless steel

254 SMO || 1.4547

The steel is characterised by the following properties:

  • Excellent resistance to pitting and crevice corrosion, PREN = ≥42,5
  • Higher strength than conventional austenitic stainless steels
  • Good weldability
  • High resistance to general corrosion
  • High resistance to acidic solutions
  • High resistance to stress corrosion

254 SMO applications

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

Chemical values – Reference analysis (weight proportion in %)

Value Proportion %
C ≤ 0,02
P ≤ 0,03
S ≤ 0,01
Si ≤ 0,7
Mn ≤ 0,03
Cr 19,5 – 20,5
Mo 6 – 7
Ni 17,5 – 18,5
Cu o,5 – 1
N 0,18 – 0,25

Mechanical values at room temperature

Tensile strength N/mm² 650 – 850
Tension elastic limit Rp 0,2 N/mm² ≥ 300
Breaking elongation A5 % 35

Assignment to current and older standards

  • Designation according to DIN: X 1 Cr Ni Mo Cu N
  • EN: 1.4547
  • UNS: S 31254
  • VdTüV: 473

Tables and rates

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