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Super Austenitic Steels 254SMO • UNS S31254 • 1.4547 Featured Image
  • Super Austenitic Steels 254SMO • UNS S31254 • 1.4547
  • Super Austenitic Steels 254SMO • UNS S31254 • 1.4547
  • Super Austenitic Steels 254SMO • UNS S31254 • 1.4547

Super Austenitic Steels 254SMO • UNS S31254 • 1.4547

Short Description:

UNS S31254 Stainless Steel Tubes. UNS S31254 is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared with conventional austenitic stainless steels such as 316L. 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 weldability 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.


  • Tube Grade: 254SMO • UNS S31254 • 1.4547
  • Tube Type: Welded, Welded & Drawn, Seamless
  • Tube Form: Straight, U Bend
  • Surface Finish: Bright Annealed, Annealed & Pickled, Polished
  • Standards (ASME/ASTM): A249, A213, A269, A312
  • Standards (EN): EN 10217-7, EN 10296-2, EN 10216-5, EN 10297-2

    • Product Detail

    Product Tags

    S31254 Stainless Steel Tubes, 1.4547 Stainless Steel Tubes

    Chemical Composition (in % by mass)
    Grade C Si Mn P S Cr Ni Mo Cu N Others
      Max. Max. Max. Max. Max.            
     S31254  0.020 0.80 1.00 0.030 0.010 19.5 – 20.5 17.5 – 18.5  6.0 – 6.5 0.50 – 1.00  0.18 – 0.25  
    1.4547 0.020 0.70 1.00 0.030 0.010 19.5 – 20.5  17.5 – 18.5  6.0 – 7.0   0.18 – 0.25   

     

     Mechanical Property & Heat Treatment 
     Grade Rp 0.2Mpa  Rp 1.0Mpa RmMpa A (%） Hardness (HRB) Heat Treatment
      Min. Min. Min. – Max. Min. Max.  
     S31254  310   675 35 100 Solution Annealed
    1.4547 300 340 650 – 850 35   Solution Annealed

     

    Tube Size Commonly Used
    OD Thickness (mm)
      0.50 0.70 0.80 0.89 1.00 1.20 1.24 1.50 1.65 2.00 2.11 2.50 2.77 3.05
    6.00 x x x x x x x x            
    6.35 x x x x x x x  x x          
    7.00 x x x x x x x x            
    7.50 x x x x x x x x            
    8.00 x x x x x x x x            
    9.00 x x x x x x x x            
    9.53 x x x x x x x x x          
    10.00  x x x x x x x x            
    11.00 x x x x x x x x            
    12.00 x x x x x x x x   x        
    12.70 x x x x x x x x x x x      
    13.00 x x x x x x x x            
    14.00 x x x x x x x x            
    15.00 x x x x x x x x            
    15.88 x x x x x x  x x x x x      
    16.00 x x x x x x  x x x x        
    17.15 x x x x x x x x x x x      
    18.00 x x x x x x x x x  x        
    19.00 x x x x x x x x x  x        
    19.05 x x  x  x x x x x x x x x x  
    20.00 x x x x  x x  x  x  x x x  x x  
    21.34 x x x x x x x x x x  x x  x  
    22.00 x x x x x x x x x x x  x  x  
    22.23 x x x x x x x x x x  x x x  
    23.00 x x x x x x x x x x  x  x x  
    24.00 x x x x x x x  x x x  x  x x  
    25.00 x x x  x x  x  x  x x x  x  x  x x
    25.40 x x x x x x x x x x  x x  x x
    26.00 x x x x x x x x x x x x x x
    26.67 x x x x x x x x x x x x x x
    26.90 x x x x x x x x x x x x x x
    28.00 x x x x x x x x x x x x x x
    28.58 x x x x x x x x x x x x x x
    30.00 x x x x x x x x x x x x x x
    31.75 x x x x x x x x x x x x x x
    32.00 x x x x x x x x x x x x x x
    33.40 x x x x x x x x x x x x x x
    35.00 x x x x x x x x x x x x x x
    36.00 x x x x x x x x x x x x x x
    38.10 x x x x x x x x x x x x x x
    42.00         x x x x x x x  x x x
    44.50           x x x x x x x x x
    48.26               x x x x x x x
    50.80       x x x x x x x x x x x
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