Nickel Alloy 20

Nickel alloy 20 is a lowcarbon, niobiumstabilized austenitic nickel/iron/chromium alloy with additions of molybdenum and copper. It exhibits exceptional corrosion resistance in chemical environments containing phosphoric acid, nitric acid, chlorides and sulfuric acid.

It also has good mechanical properties at both ambient and elevated temperatures.

Alloy 20 is an iron based, austenitic alloy with high nickel and chromium content. It has excellent corrosion resistance in chemical environments containing sulphuric acid and many other aggressive media.

The 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.

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.

Sulfuric acid pickling tanks, racks and heating coils
Phosphate coating drums and racks
Heat exchangers
Process equipment for manufacture of bullet-proof fibre, Kevlar
Mechanical seals
Process piping, Tanks, Pumps and valves

Corrosion Resistance

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.

Element	Content
Iron	35.0
Nickel	32.0-38.0
Chromium	19.0-21.0
Copper	3.0-4.0
Manganese	<2.0
Molybdenum	2.0 - 3.0
Niobium	<1.0
Silicon
Carbon	<0.07
Phosphorus	<0.045
Sulfur	<0.035

Physical Properties

	Metric	Imperial
Density	8.05 g/cm³	0.291Metric lb/in³

Mechanical Properties

Property	Metric	Imperial
Tensile strength*	620 MPa	89900psi
Yield Strength*	300 MPa	43500psi
Elongation at break*	41%	41%

_*Annealed

Tube
Pipe
Fittings
Flanges
Special Sections
Sheet
Plate
Flat Bar
Round Bar
Hollow Bar
I Beam
U Channel

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