Alloy 20
UNS N08020

Alloy 20 has excellent resistance in chemicals containing sulfuric acid, and has good resistance to environments containing chlorides, phosphoric acid and nitric acid. It contains niobium for stabilization against sensitization and resultant intergranular corrosion. It also has good mechanical properties and fabricability.

Chemical, food, pharmaceutical and plastics industries, heat exchangers, mixing tanks, pickling equipment, synthetic rubber manufacturing equipment, pumps, valves and piping.

Products of Alloy 20 Available 
• Sheet
• Plate
• Bar
• Pipe & Tube (welded & seamless)
• Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)

• Wire

Chemical composition:

% Fe Ni Cr Cu Mo C Mn Si P S Nb+Ta
Min balance 32.0 19.0 3.0 2.0 8*C
Max 38.0 21.0 4.0 3.0 0.07 2.00 1.00 0.045 0.035 1.00

Physical properties:
Density 8.08 g/cm3
Melting range 1357-1430℃

ASTM Specifications
Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting
B729 B464 B729 B468 B463 B473 B462 B366
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