Materials

ALLOY 311.4562 – UNS N08031 – X1NOCrMoCu

Alloy 31 is characterized by outstanding resistance to corrosion in halide media, both acidic and basic; outstanding resistance to sulfuric acid, even highly concentrated; outstanding resistance to corrosion and erosion-corrosion in phosphoric acid media; excellent resistance to both localized corrosion and general corrosion in chlorine dioxide bleach media; excellent resistance to both reducing and oxidizing media, and ease of fabrication and welding. Approval for pressure-vessel use involving wall temperatures from -196 to 550ºC (-320 to 1020ºF).

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Products

ALLOY 31
Availability
seamless-pipe Seamless Tubes
welded-pipe Welded Tubes
plate Plates
bar Bars  stock
flanges Flanges
accessories Fittings

Applications

  • Chemical and petrochemical industries
  • Environmental engineering
  • Oil and gas production

General characteristics

  • The higher conditional stress values of up to 90% of the yield strenght at temperature may be used for applications in which slightly greater deformation is acceptable.
  • Alloy 31 has a face-centered-cubic structure. The 0.2% nitrogen content stabilizes the austenite and reduces the tendency to precipitation of intermetallic phases.

Technical information

Specifications

 

Alloy 31 – UNS N08031
Product Norm ASTM
Seamless Tubes B-622
Welded Tubes B-619 B-626
Plates B-625
Bars B-649 B-581
Flanges B-564
Fittings  

Chemical specifications %

 

Alloy 31 – UNS N08031
Element Simbol Maximum
Carbon C 0,015
Manganese Mn 2,0
Phosphorus P 0,020
Sulfur S 0,010
Silicon Si 0,30
Nickel Ni 30,0-32,0
Chrome Cr 26,0-28,0
Molybdenum Mo 6,0-7,0
Nitrogen N 0,15-0,25
Copper Cu 1,0-1,4
Iron Fe Balance

Mechanical Properties

Alloy 31 – UNS N08031
Norm Rm min. Rp 0,2% min. E4d min.% Z min.% T.I.(J) HR B HB
B-564 94 (650) 40 (276) 40
B-581 94 (648) 40 (276) 40
B-619 94 (650) 40 (276) 40
B-622 100 (650) 40 (276) 40
B-625 94 (650) 40 (276) 40
B-626 94 (650) 40 (276) 40
B-649 94 (650) 40 (270) 40
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