alloy-20

ALLOY 20,ASTM A 265, B 366, B 463B 464, B 471, B 472, B 473,B 474, B 475,UNS N08020 NACE MR0175

Alloy 20 is a nickel–chromium–molybdenum stainless steel alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, power generation, and plastics industries. Alloy 20 resists pitting andchloride ion corrosion and its copper content protects it from sulfuric acid. Alloy 20 is not a stainless steel but a nickel alloy (ASTM). Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless.

For these and other applications,Alloy 20 is readily fabricated to produce mixing tanks, heat exchangers, process piping, pickling equipment, pumps, valves, fasteners and fittings.It is also known as Carpenter 20. Cast versions are designated CN7M.


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

 

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%
-


Applications

  • Sulfuric acid pickling tanks, racks and heating coils
  • Phosphate coating drums and racks
  • Heat exchangers
  • Bubble caps
  • Process piping
  • Mixing tanks
  • Chemical and petroleum process equipment
  • Petrochemical process equipment
  • Food and dye production

To find out more about Triton Alloys Inc Services and our Range of “Alloy 20” which we can supply directly to you, Click Here to Contact Us.