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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.
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 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Hastelloy C22 | 100[690] | 45[310] | 45 |
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.
Chemical Processing
Food Processing
Pharmaceutical Industry
Oil & Gas
Power Generation
Pulp & Paper Industries
Marine Engineering
