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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