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Incoloy 825 Sheets & Plates Supplier in Mumbai | ASTM B424 UNS N08825
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier and stockist of Incoloy 825 sheets and plates based in Mumbai, India. We supply these flat products manufactured to ASTM B424 / ASME SB-424 .
Alloy 825 (UNS N08825, Werkstoff 2.4858) is a nickel-iron-chromium alloy with Mo, Cu, and Ti additions. The nominal balance of Ni 38–46%, Cr 19.5–23.5%, Fe 22% min, Mo 2.5–3.5%, Cu 1.5–3.0%, and Ti 0.6–1.2% gives this alloy dual-environment resistance: Mo + Cu + Ni handles reducing acids (H₂SO₄, H₃PO₄), while Cr resists oxidising acids (HNO₃). Designed to provide structural integrity in highly aggressive chemical environments, this austenitic superalloy displays enhanced resistance to chloride-induced stress corrosion cracking and localised pitting corrosion. The optimised chemical composition of this superalloy is specifically tailored to provide optimal performance in highly variable processing environments, particularly where varying levels of sulphuric acid and phosphoric acid are present. The metallurgy of this superalloy provides mechanical integrity in both cryogenic and high-temperature environments.
Ti stabilisation binds carbon to TiC, preventing Cr₂₃C₆ precipitation at grain boundaries. This blocks sensitisation and intergranular corrosion (IGC) in the as-welded condition, eliminating the need for PWHT in most services. NACE MR0175/ISO 15156 is listed for sour gas (H₂S + CO₂ + Cl⁻). Incoloy 825 is available in the form of sheets and plates. The thickness of the sheets ranges from 0.5 to 4.76 mm, and the thickness of the plates ranges from 4.76 to 100 mm. The width of the sheets and plates ranges from 1000 to 2500 mm. The available product forms are hot-rolled plate, cold-rolled sheet, strip, coil, foil, shim, and clad plate. The available finishes are No.1, 2D, 2B, BA, or No.4.
Alloy 825 Sheet & Plate Specifications
Specifications of alloy 825 Sheet and Plate, including its UNS, dimensions, sizes, conditions, forms and other required information, have been provided in the following table:
| Standard | ASTM B424 / ASME SB-424 |
|---|---|
| Sheet Thickness | 0.5 to 4.76 mm |
| Plate Thickness | 4.76 to 100 mm |
| Width | 1000 – 2500 mm |
| Standard Sizes | 1000×2000, 1220×2440, 1500×3000, 2000×4000 mm |
| Condition | Annealed (stabilising anneal for corrosion service) |
| Edge | Mill (HR), Slit / Trimmed (CR) |
Chemical Composition of Nickel Alloy 825 Sheet & Plate
Refer to the table below for the chemical composition of Incoloy 825 as per ASTM B424, focusing on the addition of titanium, which counteracts intergranular corrosion.
| Element | Nickel (Ni) | Iron (Fe) | Chromium (Cr) | Molybdenum (Mo) | Copper (Cu) | Titanium (Ti) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Sulphur (S) | Aluminium (Al) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Composition | 38.0 – 46.0 | 22.0 min | 19.5 – 23.5 | 2.5 – 3.5 | 1.5 – 3.0 | 0.6 – 1.2 | 0.05 max | 1.0 max | 0.5 max | 0.03 max | 0.2 max |
Ni at 38–46% crosses the chloride SCC immunity threshold where 316L (10–14% Ni) fails. Cu + Mo + Ni synergy gives Incoloy 825 reducing acid resistance that 304/316 stainless steels cannot match.
Mechanical Properties of Incoloy 825 Sheets & Plates
Review the table below for the mechanical properties of Incoloy 825 in its solution-annealed condition as per ASTM B424 to ensure that the project meets the specified yield strengths.
| Condition | Tensile Strength | Yield 0.2% Offset | Elongation | Hardness |
|---|---|---|---|---|
| Annealed | 586 MPa (85 ksi) | 241 MPa (35 ksi) | 30% | Not specified |
| Cold Worked | 662 MPa (96 ksi) | 338 MPa (49 ksi) | 45% | 135–165 HB |
Above 540°C (1000°F), eta and sigma phases form, causing ductility and impact strength to drop. Alloy 825 is not a creep-service material. For service above 540°C, specify Incoloy 800H/HT or Inconel 625.
Equivalent Grades of Alloy 825
Refer to the table below to cross-reference the international equivalent designations of UNS N08825 to ensure that the material remains in compliance for global sourcing.
| Standard | UNS | Werkstoff | EN | ISO | JIS | GOST |
|---|---|---|---|---|---|---|
| Equivalent | N08825 | 2.4858 | NiCr21Mo | ISO 6208 | NCF 825 | ХН42МДТЮ |
Get Incoloy 825 Sheets & Plates at Competitive Prices
Available Forms of Incoloy 825 Sheet & Plate
Nicorex Alloys stocks UNS N08825 flat products in these forms:
Incoloy 825 Hot Rolled Plate
Alloy 825 Cold Rolled Sheet
Incoloy 825 Strip
Inconel Alloy 825 Coil
Inconel 825 Foil
Incoloy 825 Shim Sheet
Incoloy 825 Clad Plate
Incoloy 825 Perforated Sheet
Corrosion Performance of Incoloy 825 in Acid & Chloride Environments
Cu + Mo + Ni synergy gives INCOLOY 825 strong reducing acid resistance. In 0.5% H₂SO₄ at 99°C, corrosion sits at ~2 mpy (0.05 mm/a). In dilute H₂SO₄ with ammonium sulfate at 35–40°C: ~0.1 mpy. Plates also resist H₃PO₄, mixed acids (HNO₃ + H₂SO₄), and spent acid from tall oil splitting. Cr at 19.5–23.5% handles oxidising media including nitric acid and ferric chloride.
Ni at 38–46% makes Alloy 825 immune to chloride SCC where 316L fails above 60°C. Mo provides pitting and crevice resistance in halide media. Ti stabilisation prevents IGC in welded plate joints. For H₂SO₄ above 80% or HCl above 10%, evaluate Hastelloy C-276 or Alloy 59.
NACE MR0175 / ISO 15156 Compliance for Sour Gas Service
W.Nr. 2.4858 is listed in NACE MR0175 / ISO 15156-3 for H₂S-bearing environments. Condition: solution annealed (stabilising anneal preferred for welded components). Hardness must meet ISO 15156-3. Oil and gas buyers cannot use non-NACE listed materials in sour service. Every Nicorex Alloys shipment for sour service includes EN 10204 3.1/3.2 MTC with NACE compliance statement, hardness certification, and heat treatment records.
Welding & Fabrication for Alloy 825 Sheet & Plate
Industry Applications of Incoloy 825 Sheets & Plates
The following are the industries where Inconel 825 Sheet and Plates are widely applicable:
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Sour service vessels, subsea tubesheet plates, topside heat exchangers per NACE MR0175. Cost-effective versus Inconel 625 for moderate conditions.
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H₂SO₄ pickling tanks, H₃PO₄ evaporators, mixed-acid reactor cladding. Cu + Mo + Ni handles reducing acids; Cr handles oxidising media.
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Seawater heat exchanger tubesheets, desalination components. Ni ≥38% = chloride SCC immune.
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FGD scrubber linings and SO₂/SO₃ condensate ducting
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Fuel reprocessing dissolvers and HNO₃ storage. Ti stabilisation prevents sensitisation after thermal cycling.
How to Order Incoloy 825 Sheet & Plate from Nicorex Alloys
To place an order for the Inconel 825 Sheet and Plate as per you project requirement, submit following details.
- Product Form – Sheet, Plate, Strip, Coil, or Foil
- Thickness –Specify in mm or gauge number
- Width × Length – Standard size or custom cut
- Quantity – In kg, MT, or number of sheet
- Condition – Annealed / Stabilising Annealed
- Edge Type – Mill, Slit, Sheared, or Rolled
- Standard – ASTM B424 / ASME SB-424
- Additional Testing – (TPI, NACE, PMI, UT)
- Packaging – Standard, export-grade, wooden case
- Delivery Destination – Domestic or export
Frequently Asked Questions
Can Incoloy 825 Plate be used in Sour Gas Without PWHT?
Yes for most services. Ti stabilisation allows as-welded condition per NACE MR0175. For IGC-critical environments, a stabilising anneal at 940°C is recommended.
What Filler for Welding Alloy 825 to Carbon Steel?
ERNiCrMo-3 (Inconel 625) is preferred for dissimilar joints. Its higher Cr + Mo content prevents dilution-related corrosion at the weld interface. ERNiFeCr-1 is used for 825-to-825 joints.
At What Temperature does UNS N08825 Lose Reliability?
Above 540°C (1000°F). Eta and sigma phases form, degrading ductility and impact strength. For higher temperatures, specify Incoloy 800H/HT or Inconel 625.
How does Nickel Alloy 825 Perform in H₂SO₄ Above 80%?
Performance drops above 80% concentration at elevated temperature. For >80% H₂SO₄, evaluate Hastelloy C-276 or Alloy 59. Alloy 825 excels in dilute to moderate H₂SO₄ (up to ~60–70%) at moderate temperatures.
Can Alloy 825 Sheets Replace 316L in Marine Tubesheets?
Yes. 316L fails via chloride SCC above ~60°C in seawater. Alloy 825’s 38–46% Ni provides full SCC immunity, justifying the cost premium through extended service life.
What documentation should a buyer request when ordering UNS N08825 plates for ASME pressure vessels?
MTC per EN 10204 3.1 (minimum) or 3.2 (with TPI). Must include chemical composition, mechanical properties (tensile, yield, elongation, and hardness), heat treatment condition, grain size, and IGC test results per ASTM G28. For sour service: NACE MR0175 compliance statement + hardness certification.
What is the Price for Incoloy 825 Sheet and Plate per Kg in India?
Approximately ₹1,300–2,500/kg depending on thickness, finish, and nickel LME rates. Contact Nicorex Alloys for current pricing.