Hastelloy C22 characteristics

Hastelloy® C22 (UNS N06022/2.4602) Alloy C22 is a nickel-chromium-molybdenum solid solution strengthened super-alloy with a nominal chemical composition of 56% nickel, 22% chromium, and 13% molybdenum, with additions of iron, tungsten, and cobalt. Hastelloy C22 is a versatile nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance than other existing nickel-chromium-molybdenum alloys, including Hastelloy C276, C4 alloy, and 625 alloy.

Hastelloy C22 alloy has good resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. It has excellent resistance to oxidative aqueous media including wet chlorine, nitric acid or a mixture of oxidative acids containing chloride ions. At the same time, Hastelloy C22 alloy also has ideal resistance to reducing and oxidizing environments encountered in the process. Relying on this versatile performance, it can be used in some troublesome environments, or in a variety of production purpose factories. Hastelloy C22 alloy is exceptionally resistant to a variety of chemical environments, including strong oxidizing substances such as ferric chloride, cupric chloride, chlorine, hot contaminated solutions (organic and inorganic), formic acid, acetic acid, acetic anhydride, seawater and salt solution, etc. Hastelloy C22 alloy has the ability to resist the formation of grain boundary precipitation in the welding heat affected zone, which makes it suitable for many chemical process applications in the welded state.

Hastelloy C22 Chemical Composition, %

Grade	C≤	Mn≤	P≤	S≤	Si≤	Cr	Mo	Fe	Co≤	W	V≤	Ni
Hastelloy C22	0.01	1.0	0.04	0.03	0.08	20.0-22.5	12.5-14.5	2.0-6.0	2.5	2.5-3.5	0.35	remainder

Hastelloy C22 Mechanical Properties

Grade	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)
Hastelloy C22	100[690]	45[310]	45

Hastelloy C22 Physical Properties

Grade	Metric	Melting point
Hastelloy C22	8.90 g/cm3	1325-1370 ℃

Hastelloy C22 Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	JIS	EN
Hastelloy C22	2.4602	N06022	NW 6022	NiCr21Mo14W

Hastelloy C22 Specifications

UNS	Bar	Sheet	Plate	Forging	Pipe	BW fittings
UNS N06022	ASTM B574	ASTM B575	ASTM B575	ASME SB-564	ASME B474	ASME B366

Hastelloy C22 Metallographic structure

Hastelloy C22 has a face-centered cubic lattice structure.

Hastelloy C22 Applications

Hastelloy C22 alloy has been widely used in chemical and petrochemical fields, such as components and catalytic systems in contact with chloride-containing organics. This material is especially suitable for use in high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), and seawater corrosive environments.