Hastelloy C22 & C276 Explained
Hastelloy C22 and Hastelloy C276 are two of the most corrosion-resistant nickel-based alloys used in highly aggressive chemical and industrial environments. Engineered with a robust combination of nickel, chromium, molybdenum, and tungsten, both alloys deliver exceptional resistance to pitting, crevice corrosion, stress corrosion cracking, and attack in both oxidizing and reducing media. Hastelloy C22 offers superior versatility with excellent resistance across a wide range of chemical conditions, making it ideal for reactors, scrubbers, high-purity process systems, and pollution-control equipment. Hastelloy C276, renowned as one of the toughest corrosion-resistant alloys, performs reliably in harsh environments containing wet chlorine, sulfuric acid, hydrochloric acid, ferric and cupric chlorides, and contaminated process streams. Together, C22 and C276 provide unmatched durability, weldability, and operational safety, making them preferred choices for chemical processing, petrochemicals, flue-gas treatment, marine engineering, and high-temperature industrial applications where long-term reliability is critical.
C22/C276 HASTELLOY SHEETS AND PLATES EQUIVALENT GRADES
| Grade | UNS | Werkstoff Nr. | JIS | EN |
|---|---|---|---|---|
| Hastelloy C22 | N06022 | 2.4602 | NW 6022 | NiCr21Mo14W |
| Hastelloy C276 | N10276 | 2.4819 | NW0276 | NiMo16Cr15W |
SPECIFICATION OF HASTELLOY C22/C276 SHEETS AND PLATES
| Standard | ASTM B575 / ASME SB575 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF HASTELLOY C22/C276 SHEETS AND PLATES
| Grade | C | Mn | Si | S | Co | Ni | Cr | Fe | Mo | P |
|---|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C22 | 0.010 max | 0.50 max | 0.08 max | 0.02 max | 2.50 max | 50.015 max | 20.00 – 22.50 | 2.00 – 6.00 | 12.50 – 14.50 | 0.02 max |
| Hastelloy C276 | 0.01 max | 1.0 max | 0.08 max | 2.50 max | Balance | 14.5-16.5 | 4-7 | 15-17 | 0.04 max | 0.04 max |
MECHANICAL PROPERTIES OF HASTELLOY C22/C276 SHEETS AND PLATES
| Grade | Tensile (ksi) | .2% Yield (ksi) | Elongation % | Hardness (HRb) |
|---|---|---|---|---|
| C22 | 115 | 55 | 60 | 89 |
| C276 | 110 | 52.6 | 62 | – |
💡 Practical Difference in Use
Use Hastelloy C22 / C276 when: extreme resistance to strong acids, chlorides, pitting, crevice corrosion, and stress corrosion cracking is required in the most aggressive chemical environments. → Example: chemical reactors, acid processing equipment, flue gas desulfurization systems, and offshore chemical handling units.
Applications of Hastelloy C22 & C276 Sheets and Plates
Hastelloy C22 and C276 are high-performance nickel-chromium-molybdenum alloys engineered for exceptional resistance to oxidizing and reducing acids, chlorides, and harsh chemical media where conventional stainless steels fail.
- Chemical Processing Equipment: Outstanding resistance to sulfuric, hydrochloric, nitric, and mixed acids.
- Oil & Gas Processing: Excellent protection in sour gas and high-chloride environments.
- Pollution Control Systems: Ideal for scrubbers, absorbers, ducts, and FGD units handling acidic condensates.
When to Choose Hastelloy C22 / C276?
Hastelloy C22 and C276 are selected where maximum corrosion resistance, long service life, and operational safety under extreme chemical exposure are absolutely critical.
Choose Hastelloy C22 / C276 when:
- Service involves highly corrosive acids and aggressive chemical mixtures
- High resistance to pitting, crevice corrosion, and chloride SCC is required
- Operating conditions include high chlorides, oxidizers, and reducing agents
- Failure risk due to corrosion must be minimized at any cost
- Used in chemical processing, oil & gas, and pollution control industries
- Superior weld integrity and fabrication reliability are essential
Industries That Use Hastelloy C22 & C276 Sheets and Plates
Hastelloy C22 and C276 sheets and plates are extensively used in industries exposed to the most aggressive corrosive environments requiring absolute material reliability.
Primary application due to extreme multi-acid corrosion resistance.
Uses
Reactors, heat exchangers, acid handling tanks, and agitators.
Why Hastelloy C22 / C276?
Outstanding resistance to oxidizing and reducing acids.
Used in sour gas and high-chloride offshore environments.
Uses
Downhole components, offshore piping, and processing equipment.
Why Hastelloy C22 / C276?
Exceptional resistance to chloride SCC and sour service corrosion.
Critical for high-purity and contamination-free production.
Uses
Reactors, mixers, and high-purity process vessels.
Why Hastelloy C22 / C276?
Non-contaminating surface with superior chemical resistance.
Used in aggressive cooling and water treatment systems.
Uses
Heat exchangers, condensers, brine handling systems.
Why Hastelloy C22 / C276?
Outstanding resistance to saline and acidic water.
Used in flue gas treatment and environmental systems.
Uses
FGD absorbers, scrubbers, duct linings, and chimneys.
Why Hastelloy C22 / C276?
Resists acidic condensates and corrosive exhaust gases.
Used in highly corrosive bleaching and recovery units.
Uses
Bleach plant equipment, digesters, and chemical storage tanks.
Why Hastelloy C22 / C276?
Excellent resistance to chlorine dioxide and acidic media.
Request a Quote
Looking for high-quality Hastelloy C22 and C276 Sheets & Plates? Get in touch with us today.
Contact Us