Hastelloy C22 PlateASTM B575 UNS N06022 · Manufacturer, stockist & exporter, India
Also sold as Alloy C-22 · UNS N06022 · W.Nr 2.4602 · Nicrofer 5621
Hastelloy C22 plate is Alloy C-22 (UNS N06022) rolled to 3/16" (4.76 mm) thickness and above for pressure parts, heavy sections and cut blanks under ASTM B575. It is a nickel–chromium–molybdenum alloy with tungsten, chosen for mixed oxidising and reducing acids, and weld overlays. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on request
- NACE MR0175 on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Hastelloy C22 Plate?
Hastelloy C22 plate is a nickel–chromium–molybdenum alloy with tungsten supplied as plate to ASTM B575 (UNS N06022). Buyers specify it for mixed oxidising and reducing acids, and weld overlays. It is also sold as Alloy C-22, UNS N06022, W.Nr 2.4602.
- What it is
- Nickel–chromium–molybdenum alloy with tungsten
- Standard
- ASTM B575
- Thickness
- 3/16" (4.76 mm) and above
- Density
- 8.69 g/cm³
- Supplied as
- Annealed · HRAP · cut to size
- Best at
- Mixed oxidising and reducing acids, and weld overlays
Hastelloy C22 Plate Specification & Sizes
| Material standard | ASTM B575 · ASME SB-575 |
|---|---|
| General requirements | ASTM B906 — dimensions, tolerances and finishes |
| Grade | Hastelloy C22 · UNS N06022 · W.Nr 2.4602 |
| Thickness | 3/16" (4.76 mm) and above — thinner is sheet |
| Width × length | 1000 / 1250 / 1500 / 2000 / 2500 mm × up to 6000 mm, or cut to drawing |
| Condition & finish | Annealed · hot rolled, annealed & pickled (No.1) |
| Cutting | Cut to size — rectangles, strips, circles & rings |
| Testing | PMI · UT (plate) · intergranular corrosion · hardness, on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection · packing list · certificate of origin |
Sheet or plate?
Both are ordered under ASTM B575, so buyers often mix them up. The line is thickness: below 3/16" is sheet, 3/16" and over is plate. If your drawing calls for under 3/16" (4.76 mm), you need Hastelloy C22 sheet; for 4.76 mm and up, you are in the right place.
Hastelloy C22 Plate Cut to Size
Most C22 plate leaves us as pieces, not full mill plates. Cutting from a full plate means you pay only for what you use, and each piece keeps the heat number of the plate it came from.
| Full & part plates | Full mill plates, halves and quarters |
|---|---|
| Rectangles & strips | To your list of finished sizes, or to a drawing |
| Circles & rings | Blanks for blind flanges, covers, tube sheets and nozzles |
| Machining allowance | State finished size and allowance; thermally cut edges are normally machined back |
| Traceability | Heat number transferred to every piece before cutting |
Send a cutting list or DXF; we nest pieces to reduce off-cut and quote per piece.
Hastelloy C22 Plate Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel | As specified |
| Chromium | As specified |
| Molybdenum | As specified |
| Iron | As specified |
| Tungsten | As specified |
| Cobalt | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Vanadium | As specified |
| Silicon | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B575 for UNS N06022.
Hastelloy C22 Plate Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM B575 for UNS N06022 — Solution-annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.69 g/cm³ |
| Melting range | 1357 – 1399 °C |
| Magnetic | Non-magnetic |
| PREN (approx.) | ≈ 65 |
Hastelloy C22 Equivalent Grades
Hastelloy C22 Plate Weight Chart & Calculator
Use this to budget freight and price per piece. Weight (kg) = length (m) × width (m) × thickness (mm) × 8.69.
Example: 2000 × 1000 × 10 mm
2.0 × 1.0 × 10 × 8.69 = 173.8 kg
Total weight —
| Thickness | 2000 × 1000 plate | Per m² |
|---|---|---|
| 5 mm | 86.9 kg | 43.4 kg |
| 6 mm | 104.3 kg | 52.1 kg |
| 8 mm | 139.0 kg | 69.5 kg |
| 10 mm | 173.8 kg | 86.9 kg |
| 12 mm | 208.6 kg | 104.3 kg |
| 16 mm | 278.1 kg | 139.0 kg |
| 20 mm | 347.6 kg | 173.8 kg |
| 25 mm | 434.5 kg | 217.3 kg |
Six-digit Harmonized System heading (nickel alloy, chapter 75). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify Hastelloy C22 Plate with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. Hastelloy C22 is most often mixed up with Hastelloy C276 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from the mill certificate or optical emission (OES) testing. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | Hastelloy C22 | Hastelloy C276 |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | As specified | As specified |
| Tungsten | As specified | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
Hastelloy C22 Plate Price — What Decides It
Two quotes for "C22 plate" can differ by 20% and both be fair. We quote C22 plate per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
Hastelloy C22 Plate Testing & Inspection
Plate goes into pressure parts and heavy sections, so it is inspected for internal soundness and flatness as well as chemistry. These tests are added to the order and reported on the certificate or as separate reports.
| Ultrasonic testing | Straight-beam UT to ASTM A578 (levels A, B or C; plate 10 mm and over, applied to nickel alloys by agreement) or EN 10160 (S0–S3 body, E0–E4 edge classes) |
|---|---|
| Flatness & dimensions | Per ASTM B906 tables for thickness, width and length |
| Corrosion testing | As your specification requires — commonly ASTM G28, Method A (e.g. 625) or Method B (e.g. C276, C22) |
| PMI | Alloy verification on each plate, or each cut piece if required |
| Third-party inspection | Witness by your inspector or agency, with an EN 10204 3.2 certificate |
UT checks the plate body along a scan grid and a band along each edge, where laminations matter most for welding.
Hastelloy C22 Plate Applications
Plate is chosen for pressure-bearing walls, heavy sections and parts machined from solid. For linings, bellows and pressed parts, see Hastelloy C22 sheet.
Hastelloy C22 Plate vs C276, 625 and 825
| Grade | Plate standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| Inconel 825 | ASTM B424 | ≈ 31 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| Inconel 625 | ASTM B443 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
| Hastelloy C22 | ASTM B575 | ≈ 65 | Mixed oxidising and reducing acids, and weld overlays |
| Hastelloy C276 | ASTM B575 | ≈ 68 | The most aggressive mixed acids, wet chlorine and hypochlorite |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Hastelloy C22 Corrosion Resistance — Element by Element
Each alloying addition has a job. Knowing which one protects against your medium is the quickest way to judge whether C22 fits.
Higher chromium than C276 gives better resistance to oxidising acids and ferric/cupric chlorides.
Molybdenum keeps strong resistance in reducing acids.
Tungsten improves pitting and crevice resistance.
C22 filler is widely used to weld and overlay other alloys.
How your C22 plate order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI before processing is available on request.
- 03Processing — cutting to your sizes, with heat numbers transferred to every piece.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Standards on this page
Fabricating Heavy Hastelloy C22 Plate
Shells, heads and tube sheets mean thick sections and multi-pass welds. These are the points that decide whether C22 plate keeps its corrosion resistance after fabrication; matching filler is ERNiCrMo-10 (AWS A5.14).
General guidance only; follow your approved WPS, PQR and design code.
| Joint preparation | Bevel above about 2.4 mm, with a wider included angle (around 80°) and thinner land than for steel — nickel weld pools do not flow far. |
|---|---|
| Interpass temperature | Keep it low — typically 93 °C (200 °F) maximum for Ni-Cr-Mo alloys such as C276, C22 and 625; follow your WPS for other nickel alloys. No preheat on clean, dry plate. |
| Cleanliness | Remove grease, paint, marking crayon and sulphur-bearing compounds before welding or heat treatment. |
| Machining | Nickel alloys work-harden: carbide tools, positive rake, low speed and a feed heavy enough to cut under the hardened layer. |
How to Order Hastelloy C22 Plate: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Standard and edition — e.g. ASTM B575-latest
- Thickness × width × length, and number of pieces
- Full plates or cut pieces (attach drawing)
- Certificate type — 3.1 or 3.2, and the inspection agency
- Extra tests — NACE, UT, intergranular corrosion
- Delivery port, Incoterm and required date
Hastelloy C22 plate for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiHastelloy C22 plate — questions buyers ask
Is Hastelloy C22 the same as Alloy C-22?
Alloy C-22, UNS N06022, W.Nr 2.4602 are names used for Hastelloy C22 (W.Nr / EN numbers and older UNS variants are the closest designations; their limits can differ slightly, so specify the UNS number and ASTM grade on the order), and plate is ordered to ASTM B575 whichever name is on the enquiry.
What thickness counts as Hastelloy C22 plate?
Under ASTM B575 and its general-requirements standard, flat material below 3/16" (4.76 mm) is sheet (or strip if narrower than 24") and 3/16" (4.76 mm) and over is plate. Order the form that matches your drawing thickness.
What is the price of Hastelloy C22 plate per kg?
It moves with nickel on the LME, so a fixed list price is out of date within days. Thickness, cut size, quantity and documents also change it. Send your size and quantity and we quote the same working day.
Do you supply ultrasonically tested Hastelloy C22 plate?
Yes, UT can be added to the order — to ASTM A578 or the level your specification states. The UT report is supplied with the mill certificate.
Can Hastelloy C22 plate be cut into circles and rings?
Yes. Blanks for blind flanges, covers and tube sheets are cut from plate to your drawing, with the heat number marked on every piece.
What machining allowance should I leave on cut plate?
It depends on the cutting method and finished tolerance. Give us the finished size and your allowance; thermally cut edges are normally machined back to sound metal.
How heavy is a Hastelloy C22 plate?
Weight (kg) = length (m) × width (m) × thickness (mm) × 8.69. A 2000 × 1000 × 10 mm plate weighs about 174 kg; use the calculator on this page for your size.
What documents come with an export shipment?
An EN 10204 3.1 mill certificate (or 3.2 with a third-party inspector), commercial invoice, packing list with heat numbers, and certificate of origin. Test reports are added for any extra tests ordered.
Can Hastelloy C22 plate be supplied to NACE MR0175?
Hastelloy C22 is covered by NACE MR0175 / ISO 15156-3 within the environmental limits, heat-treatment conditions and hardness limits that standard sets for it. State the requirement on the order so that condition and hardness are verified and reported on the certificate.
Hastelloy C22 or Inconel 825 — which should I choose?
Hastelloy C22 is chosen for mixed oxidising and reducing acids, and weld overlays. Inconel 825 is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026