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UNS S31254 | 1.4547 | 254SMO

UNS S31254 is an austenitic grade in which the additions of chromium, molybdenum and nitrogen give high resistance to pitting in sea water. This alloy has a mean Pitting Resistance Equivalent Number (‚PREN‘ = Cr+3.3Mo+16N) of 43.8. Tests indicate high resistance to crevice-corrosion attack in seawater and to stress corrosion cracking in hot concentrated sodium chloride. Compared with CrNiMo 17 12 2.5 steels, it shows superior corrosion resistance in many acids at similar concentrations and its yield strength is approximately 50% higher. Good weld ability using Ni-Cr-Mo consumables. Quench annealing and short periods within the 600-1000°C range avoids the possible development of deleterious sigma phase, which may embrittle and impair corrosion resistance.

  • Heat Exchanger Tubes
  • Boiler Tubes & Pipes
  • Line Pipes
  • Hydraulic Tubes
  • Instrumentation Tubes
  • Structural Pipes

Mechanical Tubes & Pipes

TPS Technitube supplies UNS S31254 | 1.4547 | 254SMO in a big variety of forms incl.:

Chemical Composition

C = 0.020 % max S = 0.010 % max
Si = 0.80 % max Ni = 17.50-18.50 %
Mn = 1.00 % max Cr = 19.50-20.50 %
P = 0.030 % max Mo = 6.00-6.50 %
Others = N 0.18-0.22; Cu 0.50-1.00

Mechanical properties all at room temperature

Elongation in 2 in or 50 mm, (or 4D), min 40%
Rp 0.2 MPa
min. 310
Rm MPa
min. max. 675
A
min. % 35
Hardness
HRB max 96

 

 

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    TPS-Technitube Röhrenwerke GmbH
    Julius-Saxler-Str. 7 | 54550 Daun/Germany
    Tel.: +49 65 92 71 20 | Fax: +49 65 92 1305
    www.technistock.de | www.tpsd.de | E-Mail: service@tpsd.de