Alloy 20 / UNS N08020
Nickel Alloy 20 Bar
Nickel Alloy 20, UNS N08020 is an austenitic metal primarily comprised of nickel, iron, and chromium. It was originally developed to fill an industrial need for elite resistance to acidic substances, and alloy 20 is particularly adept at resisting the damaging effects of sulfuric acid. Sometimes classified as a “super alloy,” alloy 20 also displays strong mechanical properties and is relatively easy to machine and fabricate.
Alloy 20 is an iron-base, austenitic alloy with excellent corrosion resistance to a number of different media and proves to be useful in a number of applications such as flue-gas desulfurization, chemical processing, food processing and storage as well as pharmaceutical applications to name a few. Application of the alloy could result in real cost savings when carefully compared to higher-cost alloys to determine if the necessary resistance is obtained in the chosen media. Applications are limited to a maximum temperature of 1000°F per ASME.
Resistance to Corrosion
Resistance to sulfuric acid is particularly exceptional 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.
Fabrication and 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.
When stress relieving is desired, heat to a temperature below 1000°F followed by water quench after the desired time at temperature
has been established. Annealing Alloy 20 should be between 1725°F and 1850°F for 30 minutes at temperature per inch of thickness. A lower hardness can be obtained by heating to 2100°F but his may have a negative effect on the stabilization of the alloy.
Welding Alloy 20 is commonly performed via, TIG, MIG as well as submerged arc welding (SAW) using either the matching filler metal, ER320LR for TIG and MIG and E320LR for SAW. When welding to dissimilar alloys such as 316 or higher alloys such as C276 and Alloy 22, AWS ERNiCrMo-3 can be used for TIG and MIG while using ENiCrMo-3 for SAW.
Alloy 20 Material Specification: ASTM B473/ ASME SB473 Inco 20
Grade: B473 UNS N08020 Round Bar
Form: Round, Square, Hex (A/F), Bush, Rectangle, Flat, Billet, Ingot, Forging, PSQ Bar, Wire Rod, Wire (Coil Form), Wire-mesh etc.
Size Range: 15NB to 150NB In manufacturing process: Cold drawn/ Extruded
Length: 100 mm To 3000 mm Long & Above
Diameter (Size) : Metric M6 to M48, Inches – 1/4’’ to 2’’
Tolerance : H8, H9, H10, H11, H12, H13, K9, K10, K11, K12 or as per clients’ requirements
Finish : Cold Drawn, Shot Blast & Drawn, 240 Grit Belt Polished, Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish, High Polished
Condition : Cold Drawnd Polished Cold Drawn Centreless Ground & Polished, Threading
Surface : Hot Rolled Pickled or Sand Blasting Finished, Cold Drawn, Bright, Polished, Hairline
Alloy 20 Bar Equivalent Grades
|Alloy 20||32 – 38||Bal||19 – 21||3 – 4||2 – 3||0.1 – 0.3||0.02 max||1 – 2||0.02 max||0.005 max||0.7 max|
|DENSITY||MELTING POINT||TENSILE STRENGTH||YIELD STRENGTH (0.2%OFFSET)||ELONGATION|
|8.1 g/cm3||1443 °C (2430 °F)||Psi – 80000 , MPa – 551||Psi – 35000 , MPa – 241||30 %|
ASTM B473 UNS N08020 Alloy 20 Round Bar Useful Information
Quality & Inspection :
- Bundles of ASTM B473 UNS N08020 Alloy 20 Forged Bar are made of 500/1000kgs each packed in HDPE sheets.
- Container is fumigated before stuffing. All wooden box /blockes are also fumigated.
- All ASTM B473 UNS N08020 Alloy 20 Hex Bar are free from any internal defects
- Each lot is tested and ensured that material is free from Radio active contamination.
- Each ASTM B473 UNS N08020 Alloy 20 Black Bar is tested for size tolerance, Ovality, length and Roughness.
- EN10204/3.1 Certificate as per ADW0
- All required Mechanical and metallurgical tests are carried out at our works.
ASTM B473 UNS N08020 Alloy 20 Round Bar usage/ application
- Cryogenic storage tanks
- Valves, fasteners, springs, mandrels, tubing hangers
- Chemical processing
- Liquid fuel rocket motor components
- Pollution-control equipment
- Nuclear reactors
- Well head completion equipment and blow out preventers (BOP’s)