A buyer usually considers Alloy C22 when stainless steel or a lower-alloy nickel material does not provide enough resistance to oxidizing chemicals, chlorides or mixed process streams. Lakshya Steel supplies Hastelloy C22 products under the designation UNS N06022 / EN 2.4602 in pipes, tubes, plates, sheets, bars, flanges, fittings and machined components for chemical processing, pharmaceutical, pollution-control, pulp and paper, marine and waste-treatment projects.
C22 is a nickel-chromium-molybdenum-tungsten alloy valued for resistance to pitting, crevice corrosion, stress-corrosion cracking and many oxidizing and reducing media. It is not a universal solution for every chemical. Buyers should share the process medium, concentration, temperature, product form, dimensions and testing requirements through the request-a-quote form so the material and product specification can be reviewed before quotation.
Hastelloy C22 Products Available
Hastelloy C22 Round Bars
Machined shafts, fasteners and process components
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Hastelloy C22 / C276 Flanges
Forged piping connections for corrosive service
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Hastelloy C22 / C276 Seamless Pipes
Pressure and process piping
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Hastelloy C22 / C276 Welded Pipes
Fabricated process piping
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Hastelloy C22 / C276 Seamless Tubes
Heat exchangers, instrumentation and process systems
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Hastelloy C22 / C276 Welded Tubes
Fabricated tube systems
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Hastelloy C22 / C276 Plates and Sheets
Vessels, reactors, liners and fabricated equipment
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Hastelloy C22 / C276 Fittings
Elbows, tees and reducers
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Hastelloy C22 / C276 Hex Bars
Machined fittings and fasteners
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Hastelloy C22 / C276 Square Bars
Machined and fabricated sections
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Hastelloy C22 / C276 Flat Bars
Fabricated supports and machined parts
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C22 Designations and Nominal Composition
| Item | Reference Value | Buyer Note |
| UNS | N06022 | Use the UNS designation on the purchase specification. |
| EN / Werkstoff | 2.4602 | Common European material designation. |
| Nickel | Balance | Base alloying element. |
| Chromium | Approximately 22% | Supports resistance in oxidizing media. |
| Molybdenum | Approximately 13% | Supports resistance to localized corrosion. |
| Tungsten | Approximately 3% | Contributes to corrosion resistance. |
| Carbon | 0.015% max | Low carbon supports weldability. |
C22 vs C276 Selection Guide
| Selection Point | C22 | C276 | Buyer Note |
| Oxidizing media | Often offers a wider margin in oxidizing chemical environments | Widely used in reducing and mixed environments | Check actual chemical, concentration and temperature. |
| Wet chlorine and oxidizing chlorides | C22 may offer an advantage in specific wet-chlorine conditions | May be less resistant in some oxidizing chloride conditions | Use corrosion data and process review. |
| Availability by form | Available in common wrought forms | Widely available in many forms | Confirm the required product standard and dimensions. |
| Welding and fabrication | Good ductility and weldability | Good fabrication characteristics | Cleanliness and qualified procedures remain important. |
Common Standards by Product Form
| Product Form | Common Reference | RFQ Detail |
| Plate, sheet and strip | ASTM B575 | Thickness, dimensions, finish and condition |
| Rod and bar | ASTM B574 | Diameter, condition, tolerance and length |
| Seamless pipe and tube | ASTM B622 | OD or NPS, wall, length and testing |
| Welded pipe | ASTM B619 | Dimensions, weld condition and examination |
| Welded tube | ASTM B626 | OD, wall, length and testing |
| Forgings and flanges | ASTM B564 | Type, size, pressure class and facing |
| Fittings | ASTM B366 | Type, schedule and dimensional standard |
Industries We Serve
- Chemical processing: Reactors, columns, piping, heat exchangers and agitator parts Resistance to mixed oxidizing and reducing process media
- Pharmaceutical and fine chemicals: Vessels, transfer systems and process components Corrosion control in demanding batch processes
- Pollution control and waste treatment: Scrubbers, ducts, liners and wet-gas components Resistance to chloride-bearing and oxidizing condensates
- Pulp and paper: Bleaching and chemical-recovery equipment Performance in selected chlorine-bearing process streams
- Marine and offshore: Process parts exposed to chlorides Localized-corrosion resistance after service review
Frequently Asked Questions About Duplex and Super Duplex Steel
What is Hastelloy C22?
Hastelloy C22, also described as Alloy C22 or UNS N06022, is a nickel-chromium-molybdenum-tungsten alloy used for severe corrosion service. It is selected for resistance to pitting, crevice corrosion, stress-corrosion cracking and many oxidizing and reducing process media.
What is the difference between C22 and C276?
Both are nickel-chromium-molybdenum alloys. C22 contains more chromium and is often selected where oxidizing media or wet-chlorine resistance is important. C276 remains widely used in reducing and mixed chemical environments. The final choice should be based on process-specific corrosion data.
Which standards apply to C22 products?
Common references include ASTM B575 for plate and sheet, ASTM B574 for rod, ASTM B622 for seamless pipe and tube, ASTM B619 for welded pipe, ASTM B626 for welded tube, ASTM B564 for forgings and ASTM B366 for fittings.
Can Alloy C22 be welded?
C22 has good ductility and weldability when clean material, suitable filler metal and qualified procedures are used. Contamination, excessive heat input and poor surface preparation can affect the finished joint. The fabrication procedure should match the product form and service.
Is Alloy C22 suitable for seawater and chloride service?
Alloy C22 offers strong resistance to pitting and crevice corrosion in many chloride-bearing environments, but it should not be described as universally suitable for every seawater or chloride duty. Temperature, concentration, oxidizing contaminants, crevice geometry, velocity and fabrication condition must be reviewed against process-specific corrosion data.
