Inconel 825 / Incoloy 825 CoilASTM B424 UNS N08825 · Manufacturer, stockist & exporter, India
Also sold as Incoloy 825 · Alloy 825 · UNS N08825 · W.Nr 2.4858
Inconel 825 coil is supplied as full-width mother coil, slit coil or precision strip to ASTM B424. It is a nickel–iron–chromium alloy with molybdenum, copper and titanium, chosen for sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas. 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 every heat
- NACE MR0175 on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Inconel 825 Coil?
Inconel 825 coil is a nickel–iron–chromium alloy with molybdenum, copper and titanium supplied as coil to ASTM B424 (UNS N08825). Buyers specify it for sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas. It is also sold as Incoloy 825, Alloy 825, UNS N08825.
- What it is
- Nickel–iron–chromium alloy with molybdenum, copper and titanium
- Standard
- ASTM B424
- Forms
- Mother coil · slit coil · strip
- Density
- 8.14 g/cm³
- Finish
- Cold rolled, annealed & descaled
- Best at
- Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas
Inconel 825 Coil Specification & Sizes
| Material standard | ASTM B424 |
|---|---|
| Grade | Inconel 825 |
| Thickness | 0.1 mm to 6 mm, depending on mill route |
| Width | Mill width, or slit from 10 mm upwards |
| Coil weight & ID | To order — state maximum coil weight and inner diameter |
| Finish | Cold rolled, annealed & descaled; bright annealed on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Standards on this page
Inconel 825 Coil: Slitting & Cut-to-Length Specification
825 coil is bought for a production line, so state thickness, slit width, inner diameter and maximum coil weight with the grade.
| Standard | ASTM B424 |
|---|---|
| Thickness tolerance | Per ASTM B906 |
| Finish | Cold rolled, annealed & descaled · bright annealed on request |
| Temper | Annealed as standard; cold-rolled tempers by agreement |
ID, coil weight, edge, camber and interleaving: see the coil guide.
Inconel 825 Coil Chemical Composition
| Element | Weight % |
|---|---|
| Nickel | 38.0 – 46.0 |
| Iron | 22.0 min |
| Chromium | 19.5 – 23.5 |
| Molybdenum | 2.5 – 3.5 |
| Copper | 1.5 – 3.0 |
| Titanium | 0.6 – 1.2 |
| Carbon | 0.05 max |
| Manganese | 1.0 max |
| Silicon | 0.5 max |
| Aluminium | 0.2 max |
| Sulphur | 0.03 max |
Inconel 825 Coil Mechanical Properties
| Annealed | Value |
|---|---|
| Tensile strength | 586 MPa · 85 ksi |
| Yield strength 0.2% | 241 MPa · 35 ksi |
| Elongation | 30% |
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting range | 1370 – 1400 °C |
| Magnetic | Non-magnetic (annealed) |
| PREN (approx.) | ≈ 31 |
Inconel 825 Equivalent Grades
Values follow ASTM B424 / B423 / B564 for UNS N08825. Always check against the edition named on your purchase order.
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 825 Coil 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 825 is most often mixed up with SS 904L — 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. We PMI-test nickel alloys as standard and any grade on request.
| Element | Inconel 825 | SS 904L |
|---|---|---|
| Nickel | 38.0 – 46.0 | 23.0 – 28.0 |
| Chromium | 19.5 – 23.5 | 19.0 – 23.0 |
| Molybdenum | 2.5 – 3.5 | 4.0 – 5.0 |
| Copper | 1.5 – 3.0 | 1.0 – 2.0 |
| Titanium | 0.6 – 1.2 | residual |
| Iron | 22.0 min | Balance |
| Manganese | 1.0 max | 2.00 max |
Inconel 825 Coil Applications
Inconel 825 is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
Inconel 825 Coil vs 316L, 904L and 625
| Grade | Coil standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| SS 316 / 316L | ASTM A240 | ≈ 24 | Chloride-bearing process fluids, marine air and pharmaceutical service |
| Inconel 825 | ASTM B424 | ≈ 31 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L | ASTM A240 | ≈ 35 | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| Inconel 625 | ASTM B443 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Inconel 825 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 825 fits.
Around 40% nickel takes the alloy well clear of the range where austenitic stainless steels crack in hot chlorides.
Molybdenum and copper give 825 its standing in sulphuric and phosphoric acid service, and help against pitting.
About 21% chromium handles nitric acid, nitrates and oxidising salts.
Titanium stabilises the alloy, so welded parts resist sensitisation in the heat-affected zone.
How your 825 coil order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked and material is PMI-tested before processing.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked.
- 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
Welding & Fabricating Inconel 825 Coil
Inconel 825 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ERNiFeCr-1 (AWS A5.14) |
|---|---|
| Over-alloyed filler | ERNiCrMo-3 wire · ENiCrMo-3 electrode |
| Preheat | Not required; keep interpass temperature low |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also 825 fittings and 825 flanges for the matching pipe-system parts.
How to Order Inconel 825 Coil: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Thickness and width
- Coil weight and inner diameter
- Finish and edge (mill or slit)
- Certificate type
- Delivery port and date
Inconel 825 coil for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiInconel 825 coil — questions buyers ask
Is Inconel 825 the same as Incoloy 825?
Yes. Incoloy 825, Alloy 825, UNS N08825 all refer to the same material, and coil is ordered to ASTM B424 whichever name is on the enquiry.
Can Inconel 825 coil be slit to width?
Yes. Coils can be slit to narrow widths for stamping, tube making and spring work; state width tolerance and coil weight on the enquiry.
What inner diameter do Inconel 825 coils have?
508 mm (20") and 610 mm (24") are the common IDs. Tell us your decoiler ID and maximum coil weight and we slit to suit.
Can I order Inconel 825 cut-to-length sheets from coil?
Yes. Coil can be levelled and cut to length; state length tolerance and flatness.
Inconel 825 or Inconel 625 — which should I choose?
Inconel 825 is chosen for sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas. Inconel 625 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