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Nickel Alloy: Alloy 20

Penn Stainless offers alloy 20 (UNS N08020) in the following tubular forms:

  • Welded Alloy 20 Pipe
  • Welded Alloy 20 Tube
  • Seamless Alloy 20 Pipe
  • Seamless Alloy 20 Tube

Please click on each of the below tabs to review different sections of the data sheet.

General Properties
Alloy 20 is an iron-base, austenitic alloy with excellent corrosion resistance in a number of applications. When carefully compared to higher-cost alloys, Alloy 20 can be a cost-effective solution.

Applications

  • flue-gas desulfurization
  • chemical processing
  • food processing and storage
  •  pharmaceutical applications

 

Specifications

ASTM/ASME……….. UNS N08020

DIN…………………. .  2.4660

Resistance

  • Alloy 20 has exceptional resistance to sulfuric acid but the alloy shows useful resistance in phosphoric acid, nitric acid as well as in chloride environments.
  • Alloy 20 is an excellent option when chloride stress corrosion cracking is an issue and resists pitting and crevice corrosion

Weldability

  • Welding Alloy 20 is commonly performed via, TIG, MIG as well as submerged arc welding (SAW) using a matching filler metal.

Heat Treatment

  • Alloy 20 can be formed by either hot-working or cold-work using traditional methods. Hot forged material should be heated between 2100°F and 2250°F with careful temperature control insuring that the material not fall below 1800°F prior to forging.

After hot working, anneal the material by heating to 1725°F and 1850°F for a minimum of 30 minutes per inch of thickness followed by water quench.

Chemical Properties:

Ni Co Mo Mn Si Cr Cu Fe
Alloy
20		 min: 32
max: 38

2.5 max

 min: 2
max: 3

2
max

 1
max		 min: 19
max: 21

min: 3
max: 4

bal

Mechanical Properties:

Grade Tensile Strength (ksi) min Yield Strength 0.2% offset (ksi) min Elongation (% in 50mm) min
Alloy
20

80

35

 30

Physical Properties:

Denstiy
lbm/in3		 Coefficient of
Thermal Expansion (min/in)-°F		 Thermal Conductivity BTU/hr-ft-°F Specific Heat BTU/lbm -°F
at 68 °F at 68 – 212°F at 68 – 212°F
(20 – 100°C)		 at 32 – 212°F
0.292 8.16 90.8 0.101

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