S31803 Duplex Stainless Steel Pipe and Tube

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A789 UNS S31803 welded tube for heat exchanters

S31803 Pipe And Tube

  • Grade:S31803, 1.4462, X2CrNiMoN22-5-3
  • OD: 6mm-630mm, 1/4"-24"
  • WT: 0.7mm-30mm, Sch 10S-Sch XXS
  • Length: Fixed or random length as specified
  • Specifications: ASTM A789, ASTM A790, EN10216-5
  • Delivery Condition: Annealed and Pickled, Birght Annealed, Mechanical Polished, Electric Polished
  • Mill Certificate: EN 10204 3.1, EN10204 3.2
  • Marking: Continuosly stenciled as specified.
  • Packing: In bundle or plywood cases with end caps
  • Manufacturing: Seamless, Welded


S31803 is a nitrogen alloyed (≥ 0.08%) austenitic - ferritic stainless steel with improved structure stability and high general, localised and stress corrosion resistance. It is with 21% Cr and 2.5% Mo additions, performs much better than 316L grade in almost all corrosive media. The yield strength is about twice that of austenitic stainless steels. This allows the designer to save weight and makes the alloy more cost competitive compared to 316L grade. Typical operation temperatures are - 50°C/+280°C (- 58°F/+536°F). Lower temperatures could be considered, but require additional precautions, in particular for welded structures. S31803 is a multi - purpose material which can be used in various corrosive media

Chemical Composition:

% C Mn P S Si Cr Ni Mo Cu N Fe
Min - - - - - 21 4.5 2.5 - 0.08 balance
Max 0.03 2 0.03 0.03 1 23 6.5 3.5 - 0.2 balance

Mechanical Property:

20°C Tensile Strength Yield Strength Elongation % Hardness Density
Min 620Mpa 450Mpa 25% - 7.85kg/dm3
Max - - - 30HRC 7.85kg/dm3


>Oil and Gas industry including sour gas applications >Pulp and Paper industry
>Chemical industry >Phosphoric acid plants
>Acetic acid distillation towers >Sulphuric acid processes

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