Designated as UNS N06022 or DIN 2.4602, Hastelloy C-22 (also known as “Alloy C-22”), is a nickel-chromium-molybdenum alloy with outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking. It also exhibits high resistance to oxidizing media, including wet chlorine and mixtures containing nitric and oxidizing acids. Compared to Hastelloy C-276, Hastelloy C-22 has better corrosion resistance in both general conditions or high concentrates of chloride at elevated temperatures as well as other highly oxidizing environments.

1. Chemical Composition Requirements

Nominal Chemical Composition of Hastelloy C-22, %
Nickel	Balance
Chromium	22
Molybdenum	13
Iron	3
Cobalt	≤2.5
Tungsten	3
Manganese	≤0.5
Silicon	≤0.08
Carbon	≤0.01
Vanadium	≤0.35
Copper	≤0.5

2. Typical Physical Properties

Density		Electrical Resistivity		Specific Heat		Melting Range
lb/in3	g/cm3	µohm.in	µohm.m	Btu/lb.°F	J/kg*°C	°F	°C
0.314	8.69	44.9	1.14	0.098	414	2475-2550	1357-1399

3. Product Forms and Standards of Hastelloy C-22

Products Form	Standard
Sheet, Plate & Strip	ASTM B575
Billet, Rod & Bar	ASTM B574, B472
Coated Electrodes	DIN 2.4638
Bare Welding Rods& Wire	DIN 2.4635
Seamless Pipe & Tube	ASTM B622
Welded Pipe & Tube	ASTM B619, B626
Fittings	ASTM B366, B462
Forgings	ASTM B564, B462

*The mechanical properties of Hastelloy C-22 vary in different forms and heat treatment conditions.

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