Alloy 20 / UNS N08020 / W.Nr. 2.4660


Alloy 20 is a nickel-iron-chromium based, austenitic alloy with excellent corrosion resistance in chemical environments containing sulfuric acid and many other aggressive media. This alloy is stabilized with niobium to resist intergranular corrosion. Alloy 20 may provide potential cost savings when carefully compared to higher nickel-based alloys, while out performing standard stainless steels.

Industries and Applications

Alloy 20 is used in a variety of industries, including chemical processing, petrochemical and refining, marine, pharmaceutical and food processing. End use applications include storage tanks, mixing tanks, agitators, pump and valve parts, food processing equipment, fasteners and fittings. Applications are limited to a maximum temperature of 1000°F per ASME. It is also important to determine if the necessary corrosion resistance can be achieved within the given environment.

Resistance to Corrosion

Alloy 20 has very good resistance to sulfuric acid. This alloy also shows suitable resistance in phosphoric acid, nitric acid and aqueous salt solutions. Alloy 20 is an excellent option when chloride stress corrosion cracking is an issue, as it resists pitting and crevice corrosion. Caution should be taken in chloride ion containing environments because the corrosion rate can increase significantly.

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.

Common Trade Names

INCOLOY® alloy 20, Carpenter® 20 alloy, 20CB-3®

INCOLOY® is a registered trademark of the Special Metals Corporation group of companies.

Carpenter® and 20CB-3® are registered trademarks of Carpenter.

Chemical Composition (%):

Iron Nickel Chromium Copper Molybdenum Manganese Niobium* + Tantalum
Remainder 32.00 to 38.00 19.00 to 21.00 3.00 to 4.00 2.00 to 3.00 2.00 max (8 x C) to 1.00
Silicon Carbon Phosphorus Sulfur      
1.00 max 0.07 max 0.045 max 0.035 max      

*Niobium (Nb) formerly classified as Columbium (Cb).


Applicable Specifications*

Bar B473 SB473
Sheet & Plate B463
Seamless Pipe & Tube B729
Welded Pipe B464, B4741
SB464, SB474
Welded Tube B468 SB468

1Electric fusion welded pipe material only.
*EN10204-3.1 applies to all product forms.


Alloy 20 Plate

Alloy 20 Plate

Alloy 20 Fittings

Alloy 20 Fittings

Alloy 20 Tubing

Alloy 20 Tubing

Alloy 20 Pipe

Alloy 20 Pipe

Alloy 20 Bar

Alloy 20 Bar

Alloy 20 Sheet

Alloy 20 Sheet

Alloy 20 Fasteners

Alloy 20 Fasteners

Alloy 20 Flanges

Alloy 20 Flanges

Alloy 20 Welding Products

Alloy 20 Welding Products

Alloy 20 Coil

Alloy 20 Coil

Alloy 20 Welded Components

Alloy 20 Welding

Alloy 20 Machined Parts

Alloy 20 Machining

Alloy 20 Forgings

Alloy 20 Forgings

Alloy 20 Custom Profiles

Alloy 20 Custom Profiles

Alloy 20 Plate Shapes

Alloy 20 Plate Shapes