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Hastelloy C-22 (UNS NO6022, W.Nr.2.4602, NiCr21Mo14W)

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Common Names: Hastelloy C22, Nickel 22, Alloy 22, Nicrofer 5621.

Hastelloy C22 (UNS N06022, W. Nr. 2.4602, NiCr21Mo14W) is a fully austenitic advanced corrosion-resistant alloy that offers resistance to both aqueous corrosion and attack at elevated temperatures.

Form	ASTM
Rod	B 574
Plate, sheet and strip	B 575
Seamless pipe and tube	B 622
Welded pipe	B 619, B 775
Welded tube	B 626, B 751
Welding fitting	B 366
Forged or rolled pipe flange and forged fitting	B 462
Billet and bar for reforging	B 472
Forging	B 564

Chemical composition

%	Ni	Cr	Mo	Fe	W	Co	C	Mn	Si	P	S	V
min	balance	20.0	12.5	2.0	2.5
max	balance	22.5	14.5	6.0	3.5	2.5	0.015	0.50	0.08	0.020	0.020	0.35

Physical properties

Density	8.69 g/cm3
Melting range	1325-1370℃

Features: Hastelloy C-22 is a versatile Ni-Cr-Mo-W alloy with better comprehensive corrosion resistance performance than other Ni-Cr-Mo alloys, including Hastelloy C-276, Hastelloy C-4 and Inconel 625. Hastelloy C-22 has outstanding resistance to pitting, crevice corrosion and stress corrosion cracking. It has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chloride ions. It also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. So it can be used where “upset” conditions are likely to occur or in multi-purpose plants. Hastelloy C-22 has exceptional resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, chlorine, hot contaminated solutions (organic and inorganic), formic and acetic acids, acetic anhydride, and seawater and brine solutions. It resists the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition.

Applications: Chemical processing involving acetic acid, acetic anhydride and complex acid mixture; pickling operations; cellophane manufacture; chlorination systems; electro-galvanizing rolls, expansion bellows; flue gas scrubber systems; geothermal wells; HF furnace scrubbers; incineration scrubbers; nuclear fuel reprocessing; pesticide production; phosphoric acid production; heat exchangers; selective leaching systems; sulfur dioxide cooling towers; sulphonation systems; and weld overlay.

Note: Hastelloy and C-22 are registered trademarks of Haynes International, Inc. Inconel is a registered trademark of the Special Metals Corporation group of companies.

Alloy	ASTM	DIN	GB
Alloy	ASTM	DIN	New grades	Old grades
Hastelloy C-22	UNS N06022	2.4602	NS3308
Hastelloy C-276	UNS N10276	2.4819	NS3304	NS334
Hastelloy C-4	UNS N06455	2.4610
Hastelloy C-2000	UNS N06200	2.4675
Hastelloy C-59	UNS N06059	2.4605
Hastelloy B	UNS N10001		NS3201	NS321
Hastelloy B-2	UNS N10665	2.4617	NS3202	NS322
Hastelloy B-3	UNS N10675	2.4615	NS3203
Hastelloy X	UNS N06002	2.4613
Hastelloy G30	UNS N06030	2.4603