INCOLOY® alloy 020


Alloy 20

ASTM B 366, B 463
B 464, B 471, B 472, B 473
B 464, B 471, B 472, B 473
UNS N08020

Other common names: Carpenter 20, 20Cb-3®, Incoloy® alloy

Alloy 20, also known as Carpenter 20, is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. This superalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion.

Although originally designed for use in sulfuric acid related industries, Alloy 20 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping. Carpenter 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication.

There has long been a debate on whether Carpenter 20 is a stainless steel or a nickel alloy because the nickel content is right on the border of defining it as one way or the other. So, depending on who you talk to this alloy may be referred to as alloy 20 Stainless Steel or as a nickel alloy. Either way it is still great for corrosion resistance.

In what forms is Alloy 20 Available at Mega Mex?

Pipe & Tube (welded & seamless)
Fittings Elbows, tees, stub-ends, returns, caps, crosses, reducers, pipe nipples, etc.
Welding Wire (AWS Classifications: ER320LR and E320LR-16)

What are the characteristics of Alloy 20?

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, %

32.00-38.00Balance19.0-21.03.0-4.02.0-3.08xC-1.0 max.07 max2.0 max.045 max.035 max1.0 max

In what applications is Alloy 20 used?

Synthetic rubber manufacturing equipment
Processing of pharmaceuticals, plastics and organic and heavy chemicals
Tanks, piping, heat exchangers, pumps, valves, and other process equipment
Acid cleaning and pickling equipment
Chemical process piping, reactor vessels
Bubble caps
Petrochemical process equipment
Food and dye production

ASTM Specifications

Pipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarForgingFitting

Mechanical Properties

Annealed Material

FormTensile Min.Yield Min. (.2% offset)Elongation Min.Reduction of Area Min.
Bar (hot or cold finished)80 ksi35 ksi30%50%
Sheet/Plate80 ksi35 ksi30%

*Incoloy® is a registered trademark of Special Metals Corporation group of Companies.