Incoloy 825 Plates | ASTM B424 UNS N08825 Corrosion-Resistant Workhorse
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When a sulfuric acid plant in Gujarat watched three different stainless and low‑nickel alloys pit through in under 18 months, the final shutdown cost crossed ₹9 crore until the piping and heater coils were rebuilt in Incoloy 825 Plates, which have now run over 6 years with no measurable loss of wall thickness in hot sulfuric and phosphoric acid service. This nickel‑iron‑chromium alloy (UNS N08825) gives procurement heads, design engineers, and fabricators a stable, code‑approved solution where 316L, 904L, even Alloy 20 struggle with mixed acids, chlorides, and elevated temperature.
Incoloy 825 combines 38–46% nickel with chromium, molybdenum, copper, and titanium to resist general corrosion, pitting, crevice attack, and chloride‑ion stress‑corrosion cracking in both oxidizing and reducing media such as sulfuric, phosphoric, and nitric acids plus seawater and sour gas. Mechanical properties remain robust, with plate tensile strength about 550–662 MPa and yield strength around 220–338 MPa in annealed condition, allowing thinner walls than many stainless steels at similar design pressures.
Aurico Alloys LLP supplies affordable, authentic Incoloy 825 Plates with full ASTM B424 / ASME SB424 and NACE MR0175 documentation for chemical, oil & gas, marine, pharma, and power projects, plus hardware and industrial supply stores. As a leading Incoloy 825 Plates supplier, stockist, exporter in India to abroad, the company supports EPCs and OEMs who need fast delivery, genuine UNS N08825 chemistry, and mill test traceability from Mumbai stock.
High-quality Incoloy 825 Plates ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | Incoloy 825 (UNS N08825, W.Nr. 2.4858) |
| Standards | ASTM B424 / ASME SB424, ASTM B906, NACE MR0175 / ISO 15156 |
| Thickness Range | 4.75 mm – 150 mm |
| Width / Length | Up to ~2500 mm width, ~6000 mm length standard |
| Finishes | HR, CR, annealed & pickled, 2B, No.1, polished |
| Documentation | EN 10204 3.1 MTC, PMI, NACE / PED references on request |
| Price | INR 1,600 – 2,000 per kg. Indicative USD 19 – 24 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N08825 |
| Werkstoff / EN number | 2.4858 |
| EN designation | NiCr21Mo |
| Density | 8.14 g/cm3 |
| Melting range | 1370-1400 °C |
| Specific heat | 440 J/kg·°C |
| Curie temperature | < -196 °C |
| Magnetic permeability (at 200 oersted / 15.9 kA/m) | 1.005 |
| Plate, sheet and strip specification | ASTM B424 / B906 |
Identifiers and physical constants for Incoloy 825. A dash means no such designation is published for this grade.
Stock & Product Availability
As Incoloy 825 plate suppliers in Mumbai for sulfuric acid piping and chemical heating coils, Aurico stocks ASTM B424 plates for continuous acid circulation lines and steam‑heated coils in pickling and fertilizer plants. ASTM B424 Incoloy 825 plate stockist for phosphoric acid evaporators and vessels in India ensures ready availability for phosphoric plants in Gujarat, Odisha, and Saudi‑linked EPC jobs.
UNS N08825 plate is offered for pharmaceutical high-pressure reactor liners where both acid and chloride resistance are essential.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 38.0 | 46.0 |
| Iron (Fe) | 22.0 | — |
| Chromium (Cr) | 19.5 | 23.5 |
| Molybdenum (Mo) | 2.5 | 3.5 |
| Copper (Cu) | 1.5 | 3.0 |
| Titanium (Ti) | 0.6 | 1.2 |
| Carbon (C) | — | 0.05 |
| Manganese (Mn) | — | 1.0 |
| Sulfur (S) | — | 0.03 |
| Silicon (Si) | — | 0.5 |
| Aluminium (Al) | — | 0.2 |
Composition limits for Incoloy 825. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Plate Value (Annealed) |
|---|---|
| Tensile Strength | ≈550–662 MPa (80,000–96,000 psi) |
| Yield Strength (0.2%) | ≈220–338 MPa (32,000–49,000 psi) |
| Elongation | ≥30–45 % in 50 mm |
| Design Temp (pressure vessels) | Up to about 800 °F (≈427 °C) |
Applications & Benefits
Why this grade
Incoloy 825 is not a high-temperature grade at all. It takes the 800 base and adds about 3% molybdenum, 2% copper and titanium stabilisation, producing the wet-corrosion member of the family: sulphuric and phosphoric acid duty, and the resistance to chloride stress-corrosion cracking that 316L does not have.
- Chemical & Pharma: Corrosion resistant Alloy 825 plates for pharmaceutical distillation columns and agitators, sulfuric and phosphoric acid heaters, and nitric acid piping where stainless steels pit and crack.
- Oil, Gas & Marine: NACE MR0175 Incoloy 825 plates for sour gas service and downhole oilfield equipment, plus marine grade Incoloy 825 plates for offshore platform seawater piping and heat exchangers and subsea control lines.
- Power & Pollution Control: ASME SB424 Incoloy 825 plates for radioactive waste handling and nuclear fuel reprocessing, FGD absorbers, and high‑nickel plates for electrostatic precipitators and scrubbers in thermal power plants.
- General Sourcing: Incoloy 825 plate stockholders in Maharashtra for subsea control lines and umbilicals, with custom‑cut plate sizes for waste‑to‑energy plant scrubbers in Mumbai.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Incoloy 825 plates from Aurico Alloys LLP combine UNS N08825 / ASTM B424 pedigree with proven resistance to sulfuric, phosphoric, seawater, and sour gas environments, giving chemical, oil & gas, marine, pharma, and power projects a longer‑life, code‑approved alternative to stainless or low‑nickel alloys that repeatedly fail in service so are your most aggressive acid and seawater systems protected by the right grade of Incoloy 825 plates?