Nickel and nickel alloys · Alloy C-22HS / Hastelloy C-22HS / UNS N07022

Hastelloy C-22HS (UNS N07022): Technical Data Sheet and Engineering Applications

Engineering Review of Hastelloy C-22HS (UNS N07022) Superalloy

Hastelloy C-22HS (UNS N07022) is a precipitation-hardening nickel-chromium-molybdenum alloy, designed to achieve synergy between superior corrosion resistance and excellent mechanical properties. EV Group China technologists qualify this material as key for critically important components operating in aggressive environments with high mechanical loads, including equipment for the chemical industry, high-pressure high-temperature (HPHT) hydrocarbon production, and the aerospace industry. The alloy is characterized by structural stability, preventing localized corrosion.

Product Form	Alloy Marking	Regulating Specifications
Bars, wire, pipes, pipe blanks, forgings	Hastelloy C-22HS, UNS N07022	ASTM
Bars, wire, pipes, pipe blanks, forgings	Hastelloy C-22HS, UNS N07022	ASTM
Bars, wire, pipes, pipe blanks, forgings	Hastelloy C-22HS, UNS N07022	B637, B983

A key application area for Hastelloy C-22HS is the production of equipment for handling highly aggressive chemical media, such as concentrated acids and alkalis. Thanks to its optimized microstructure, the alloy effectively resists localized corrosion damage, including pitting, crevice, and intergranular corrosion (IGC). EV Group China engineers recommend it for the manufacture of reactors, valves, and critical pipeline systems that come into contact with oxidizing and reducing media.

In the oil and gas sector, Alloy C-22HS is an indispensable solution for components operating in high-temperature and high-pressure (HPHT) conditions, especially in the presence of hydrogen sulfide (H2S) and chlorides. Flange connections, fasteners, and wellhead components made from this alloy ensure long-term structural integrity in environments with a high risk of sulfide stress cracking (SSC) and corrosion cracking.

The aerospace industry uses Hastelloy C-22HS to create critical components for gas turbine engines subjected to cyclic thermomechanical loads. The unique combination of high yield strength and fatigue strength guarantees the reliability and long service life of parts operating under intense heating and cooling conditions.

Thanks to its biocompatibility and stability, the alloy finds application in energy for power plant equipment and in medicine for the manufacture of implants and surgical instruments. The use of Hastelloy C-22HS in critically important assemblies guarantees their trouble-free operation and compliance with the strictest industry safety standards.

Normalized Chemical Composition of Hastelloy C-22HS Alloy, % by mass

C	<0,01
Mn	<0,8
S	0,08
Cr	21,0
Mo	17,0
Fe	<2,0
Al	<0,5
Co	<1,0
B	<0,006
Ni	58 (balance)

Mechanical Characteristics of Alloy C-22HS at Elevated Temperatures

Hot-rolled product (Temperature, °C)	Yield Strength, MPa	Tensile Strength, MPa	Elongation, %	Reduction of Area, %
20	690	1202	44,2	57,7
100	627	1153	47,7	57,7
200	579	1089	48,3	60
300	539	1047	52,7	63,9
400	518	1006	52,3	63,4
500	507	964	50,3	63,2
600	488	902	49,2	66,9

Cold-rolled product (Temperature, °C)	Yield Strength, MPa	Tensile Strength, MPa	Elongation, %
20	759	1230	40,9
100	710	1190	43,6
200	658	1131	43,4
300	630	1103	47,8
400	590	1049	48,2
500	572	1003	47,1
600	547	928	46,3

Hastelloy C-22HS superalloy is the result of applying advanced metallurgical processes aimed at creating a material with uncompromising performance for critical applications. EV Group China ensures full compliance of all supplied products with ASTM specifications and the customer's individual project technical requirements.