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Alloy 20 -N08020

ASTM A 265, B 366, B 463
B 464, B 471, B 472, B 473
B 474, B 475
UNS N08020
NACE MR0175

Other common names: Carpenter 20, 20Cb-3®, Incoloy® alloy 20

Alloy 20, also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. This superalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. Carpenter 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Although originally designed for use in sulfuric acid related industries, Alloy 20 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping.

Characteristics 

  • Excellent general corrosion resistance to sulfuric acid
  • Excellent resistance to chloride stress corrosion cracking
  • Excellent mechanical properties and fabricability
  • Minimal carbide precipitation during welding
  • Excels in resisting corrosion to hot sulfuric acids

Chemical Composition, %

Ni
Fe
Cr
Cu
Mo
Nb
32.00-38.00
Balance
19.0-21.0
3.0-4.0
2.0-3.0
8xC-1.0max
C
Mn
P
S
Si
.07max
2.0max
.045max
.035max
1.0max

Applications

  • Synthetic rubber manufacturing equipment
  • Processing of pharmaceuticals, plastics and organic and heavy chemicals
  • Tanks, piping, heat exchangers, pumps, valves, and other process equipment
  • Acid cleaning and pickling equipment
  • Chemical process piping, reactor vessels
  • Bubble caps
  • Petrochemical process equipment
  • Food and dye production

ASTM Specifications

Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate
Bar
Forging Fitting
B729 B464 B729 B468 B463
B473
B462 B366
Mechanical Properties
Annealed Material
Form Tensile Min. Yield Min. (.2% offset) Elongation Min. Reduction of Area Min.
Bar (hot or cold finished) 80 ksi 35 ksi 30% 50%
Sheet/Plate
80 ksi
35 ksi
30%
-

*Incoloy® is a registered trademark of Special Metals Corporation group of Companies.

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