Alloy 31

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alloy 31 grade alloy 31 uns n08031
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Alloy 31 UNS N08031 Fittings

ALLOY

GRADE UNS NO DIN/WERKSTOFF
ALLOY 28 Fittings N08028 1.4563
ALLOY 31 Fittings S08031 -
ALLOY 20 (WP20CB) Fittings N08020 -
ALLOY 200 (WPN) Fittings N02200 2.4066
ALLOY 201 (WPNL) Fittings N02201 2.4068
ALLOY 400 (WPNC) Fittings N04400 2.4360
ALLOY 600 (WPNCI) Fittings N06600 2.4816
ALLOY 625 (WPNCMC) Fittings N06625 2.4856
ALLOY 800 (WPNIC) Fittings N08800 1.4876
ALLOY 800H (WPNIC10) Fittings N08810 1.4958
ALLOY 800HT (WPNIC11) Fittings N08811 1.4959
ALLOY 825 (WPNICMC) Fittings N08825 2.4858
ALLOY C276 (WPH) Fittings N10276 2.4819
ALLOY C4 Fittings N06455 2.4610
ALLOY B2 Fittings N10665 2.4617
ALLOY G30 Fittings N06030 -

 

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 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).

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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