Inconel 825 (Incoloy 825) Pipe Fittings Supplier in IndiaASTM B366 WPNICMC · UNS N08825
Also sold as Incoloy 825 · Alloy 825 · UNS N08825 · W.Nr 2.4858
Inconel 825 pipe fittings are made to ASTM B366 WPNICMC for buttweld fittings and ASTM B564 for forged socket-weld and threaded fittings, with dimensions to ASME B16.9 and B16.11. 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. manufactures, trades and exports Inconel 825 pipe fittings; depending on the product and order, material is produced or sourced and processed to the PO. EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- Mill & traded 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 825 Pipe Fittings?
Inconel 825 pipe fittings is a nickel–iron–chromium alloy with molybdenum, copper and titanium supplied as pipe fittings to ASTM B366 WPNICMC (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
- Buttweld
- ASTM B366 WPNICMC
- Forged
- ASTM B564
- Dimensions
- ASME B16.9 · B16.11 · MSS SP-43
- Sizes
- Buttweld ½" – 48" · forged ⅛" – 4"
- Best at
- Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas
Inconel 825 Pipe Fittings Specification & Sizes
| Buttweld fittings | ASTM B366 WPNICMC — dimensions to ASME B16.9, MSS SP-43 |
|---|---|
| Forged fittings | ASTM B564 — dimensions to ASME B16.11 |
| Short-radius elbows | ASME B16.9 (formerly B16.28) |
| Buttweld sizes | NPS ½" to 48", schedule to match the pipe |
| Forged classes | Socket weld 3000 / 6000 / 9000 · threaded 2000 / 3000 / 6000 |
| Types | Elbow · Tee · Reducer · Cap · Stub end · Cross · Bend · Lateral · Coupling · Union · Nipple · Plug |
| Testing | PMI · dimensional · radiography of welded fittings · IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Choosing Inconel 825 Fittings: Elbow Radius, Schedule & Class
State seamless or welded, and the non-destructive examination you need on welds.
Radius (LR, SR, 3D), the schedule-to-class map and the 1.5 mm socket-weld gap are explained in the fittings guide. For 825, buttweld fittings are ASTM B366 WPNICMC and forged fittings ASTM B564.
Inconel 825 Pipe Fittings Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel | As specified |
| Iron | As specified |
| Chromium | As specified |
| Molybdenum | As specified |
| Copper | As specified |
| Titanium | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Aluminium | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B424 / B423 / B564 for UNS N08825.
Inconel 825 Pipe Fittings 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 B424 / B423 / B564 for UNS N08825 — Annealed.
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
Inconel 825 buttweld fitting dimensions — ASME B16.9
Centre-to-end and end-to-end dimensions are the same for every alloy; the wall thickness follows the pipe schedule. Values in mm.
| NPS | OD | 90° LR elbow A | 45° elbow B | Tee C | Reducer H | Cap E |
|---|---|---|---|---|---|---|
| ½" | 21.3 | 38 | 16 | 25 | — | 25 |
| 1" | 33.4 | 38 | 22 | 38 | 51 | 38 |
| 1½" | 48.3 | 57 | 29 | 57 | 64 | 38 |
| 2" | 60.3 | 76 | 35 | 64 | 76 | 38 |
| 3" | 88.9 | 114 | 51 | 86 | 89 | 51 |
| 4" | 114.3 | 152 | 64 | 105 | 102 | 64 |
| 6" | 168.3 | 229 | 95 | 143 | 140 | 89 |
| 8" | 219.1 | 305 | 127 | 178 | 152 | 102 |
| 10" | 273.1 | 381 | 159 | 216 | 178 | 127 |
| 12" | 323.9 | 457 | 190 | 254 | 203 | 152 |
Full chart to 24": ASME B16.9 fitting dimensions.
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 Pipe Fittings 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. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | Inconel 825 | SS 904L |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | As specified | As specified |
| Copper | As specified | As specified |
| Titanium | As specified | — |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
Inconel 825 Pipe Fittings Price — What Decides It
Two quotes for "825 pipe fittings" can differ by 20% and both be fair. We quote 825 pipe fittings 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 825 pipe fittings by type
Inconel 825 Pipe Fittings 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 Pipe Fittings vs 316L, 904L and 625
| Grade | Pipe Fittings standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| SS 316 / 316L | ASTM A403 WP316L | ≈ 24 | Chloride-bearing process fluids, marine air and pharmaceutical service |
| Inconel 825 | ASTM B366 WPNICMC | ≈ 31 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L | ASTM A403 WP904L | ≈ 35 | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| Inconel 625 | ASTM B366 WPNCMC | ≈ 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.
High nickel content 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.
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 pipe fittings 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 can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked as specified in the PO.
- 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 Pipe Fittings
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 Pipe Fittings: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Fitting type, size and schedule / class
- Buttweld, socket weld or threaded
- Seamless or welded (buttweld fittings)
- Material standard and grade marking
- Certificate type and extra tests
- Delivery port, Incoterm and required date
Inconel 825 pipe fittings — questions buyers ask
Is Inconel 825 the same as Incoloy 825?
Incoloy 825, Alloy 825, UNS N08825 are names used for Inconel 825, and pipe fittings is ordered to ASTM B366 WPNICMC whichever name is on the enquiry.
Which standard covers Inconel 825 buttweld fittings?
ASTM B366 WPNICMC is the material specification; dimensions follow ASME B16.9 (and MSS SP-43 for light-wall fittings). Forged socket-weld and threaded fittings are made from ASTM B564 material to ASME B16.11.
What is the difference between Inconel 825 WP-S and WP-W fittings?
Seamless fittings are made from seamless pipe or bar; welded fittings are formed from plate or welded pipe. State which you need and the weld examination required.
Can Inconel 825 fittings be welded to carbon steel?
Yes — a nickel-base filler such as ERNiCr-3 (or ERNiCrMo-3) is used when joining it to carbon steel.
Can Inconel 825 pipe fittings be supplied to NACE MR0175?
Inconel 825 (UNS N08825) can be supplied for sour service when the PO specifies NACE MR0175 / ISO 15156; acceptability depends on the material condition, hardness and the environmental limits in that standard, which the purchaser must confirm for the application.
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