Inconel 625 PlateASTM B443 UNS N06625 · Manufacturer, stockist & exporter, India
Also sold as Alloy 625 · UNS N06625 · W.Nr 2.4856 · Nicrofer 6020
Inconel 625 plate is Alloy 625 (UNS N06625) rolled to 3/16" (4.76 mm) thickness and above for pressure parts, heavy sections and cut blanks under ASTM B443. It is a nickel–chromium–molybdenum alloy with niobium, chosen for seawater, high strength and high temperature in one alloy. 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 Inconel 625 Plate?
Inconel 625 plate is a nickel–chromium–molybdenum alloy with niobium supplied as plate to ASTM B443 (UNS N06625). Buyers specify it for seawater, high strength and high temperature in one alloy. It is also sold as Alloy 625, UNS N06625, W.Nr 2.4856.
- What it is
- Nickel–chromium–molybdenum alloy with niobium
- Standard
- ASTM B443
- Thickness
- 3/16" (4.76 mm) and above
- Density
- 8.44 g/cm³
- Supplied as
- Annealed · HRAP · cut to size
- Best at
- Seawater, high strength and high temperature in one alloy
Inconel 625 Plate Specification & Sizes
| Material standard | ASTM B443 · ASME SB-443 |
|---|---|
| General requirements | ASTM B906 — dimensions, tolerances and finishes |
| Grade | Inconel 625 · UNS N06625 · W.Nr 2.4856 |
| 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 B443, 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 Inconel 625 sheet; for 4.76 mm and up, you are in the right place.
Inconel 625 Plate Cut to Size
Most 625 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.
Inconel 625 Plate Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel | As specified |
| Chromium | As specified |
| Molybdenum | As specified |
| Niobium + Tantalum | As specified |
| Iron | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Titanium | As specified |
| Aluminium | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B443 for UNS N06625.
Inconel 625 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 B443 for UNS N06625 — Grade 1 annealed plate.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting range | 1290 – 1350 °C |
| Magnetic | Non-magnetic |
| PREN (approx.) | ≈ 51 |
Inconel 625 Equivalent Grades
Inconel 625 Plate Weight Chart & Calculator
Use this to budget freight and price per piece. Weight (kg) = length (m) × width (m) × thickness (mm) × 8.44.
Example: 2000 × 1000 × 10 mm
2.0 × 1.0 × 10 × 8.44 = 168.8 kg
Total weight —
| Thickness | 2000 × 1000 plate | Per m² |
|---|---|---|
| 5 mm | 84.4 kg | 42.2 kg |
| 6 mm | 101.3 kg | 50.6 kg |
| 8 mm | 135.0 kg | 67.5 kg |
| 10 mm | 168.8 kg | 84.4 kg |
| 12 mm | 202.6 kg | 101.3 kg |
| 16 mm | 270.1 kg | 135.0 kg |
| 20 mm | 337.6 kg | 168.8 kg |
| 25 mm | 422.0 kg | 211.0 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 Inconel 625 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. Inconel 625 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 | Inconel 625 | Hastelloy C276 |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | As specified | As specified |
| Titanium | As specified | — |
| Niobium | As specified | — |
| Tungsten | — | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
Inconel 625 Plate Price — What Decides It
Two quotes for "625 plate" can differ by 20% and both be fair. We quote 625 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.
Inconel 625 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.
Inconel 625 Plate Applications
Plate is chosen for pressure-bearing walls, heavy sections and parts machined from solid. For linings, bellows and pressed parts, see Inconel 625 sheet.
Inconel 625 Plate vs 825, 2507 and C276
| 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 |
| Super Duplex 2507 | ASTM A240 | ≈ 42 | Seawater and high-chloride service where strength also matters |
| Inconel 625 | ASTM B443 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
| 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.
Inconel 625 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 625 fits.
About 9% molybdenum gives PREN above 50 — seawater pitting is rarely a concern.
Niobium strengthens the matrix without heat treatment.
High nickel makes it virtually immune to chloride stress-corrosion cracking.
Keeps useful strength and oxidation resistance at high temperature.
How your 625 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 Inconel 625 Plate
Shells, heads and tube sheets mean thick sections and multi-pass welds. These are the points that decide whether 625 plate keeps its corrosion resistance after fabrication; matching filler is ERNiCrMo-3 (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 Inconel 625 Plate: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Standard and edition — e.g. ASTM B443-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
Inconel 625 plate for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiInconel 625 plate — questions buyers ask
Is Inconel 625 the same as Alloy 625?
Alloy 625, UNS N06625, W.Nr 2.4856 are names used for Inconel 625 (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 B443 whichever name is on the enquiry.
What thickness counts as Inconel 625 plate?
Under ASTM B443 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 Inconel 625 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 Inconel 625 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 Inconel 625 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 Inconel 625 plate?
Weight (kg) = length (m) × width (m) × thickness (mm) × 8.44. A 2000 × 1000 × 10 mm plate weighs about 169 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 Inconel 625 plate be supplied to NACE MR0175?
Inconel 625 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.
Inconel 625 or Hastelloy C276 — which should I choose?
Inconel 625 is chosen for seawater, high strength and high temperature in one alloy. Hastelloy C276 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