UNS N08825(Incoloy 825)
Generic Name & Other Designation
Incoloy 825®, Alloy 825, Nickel Alloy 825, W.Nr. 2.4858, NiCr21Mo
Product Overview
UNS N08825 is a titanium-stabilized nickel-iron-chromium superalloy engineered with significant additions of molybdenum, copper, and titanium. Formulated to provide exceptional stability across harsh aqueous environments, UNS N08825 effectively bridges the gap between austenitic stainless steels and premium nickel-base alloys.
It maintains outstanding mechanical strength from cryogenic temperatures up to 540°C (1000°F). The alloy’s balance of nickel, chromium, and copper ensures long-lasting service life when exposed to sulfuric, phosphoric, and organic acids.
Key Highlights
✅ Dual Protection: Superior resistance to both reducing and oxidizing acid system conditions.
✅ SCC Immunity: Exceptional resistance to chloride-induced stress corrosion cracking (SCC).
✅ Localized Corrosion Guard: High molybdenum content minimizes pitting and crevice corrosion attack.
✅ Intergranular Stability: Titanium addition stabilizes the alloy against intergranular sensitization during welding.
Chemical Composition & Physical Properties
1. Chemical Composition (wt%)
Element | Ni | Cr | Fe | Mo | Cu | Ti | Al | C | Mn | Si | S |
Min (%) | 38.0 | 19.5 | 22.0 | 2.5 | 1.5 | 0.6 | — | — | — | — | — |
Max (%) | 46.0 | 23.5 | Bal. | 3.5 | 3.0 | 1.2 | 0.20 | 0.05 | 1.0 | 0.50 | 0.030 |
(Note: Maximum limits per ASTM B423/B424: Phosphorus P ≤ 0.030%.)
2. Physical & Mechanical Properties
Parameter | Value / Standard (Annealed State) |
Density | 8.14 g/cm³ (0.294 lb/in³) |
Melting Range | 1370°C – 1400°C (2500°F – 2550°F) |
Tensile Strength (Rm) | ≥ 586 MPa (85 ksi) |
Yield Strength (0.2%, Rp0.2) | ≥ 241 MPa (35 ksi) |
Elongation (A5) | ≥ 30% |
Hardness Range | ≤ 217 HBW (95 HRB) |
Available Forms
Tubular Products: Seamless and welded pipes, heat exchanger tubes, hydraulic tubing.
Flat Products: Hot-rolled plates, cold-rolled sheets, strip coils.
Bar & Rod: Forged round bars, hexagonal shafts, wire rod.
Fittings & Flanges: Elbows, tees, reducers, blind and slip-on flanges.
Typical Application Scenarios
Oil & Gas Processing: Downhole sour gas well equipment, oilfield recovery tubing, and piping.
Chemical Manufacture: Sulfuric acid pickling evaporators, heating coils, and vessel linings.
Nuclear Reprocessing: Fuel element dissolvers and radioactive waste containment systems.
Pollution Control: Flue gas desulfurization (FGD) scrubbers and acid neutralization tanks.
Quality Assurance & Testing
100% Hydrostatic and Eddy Current testing for tubular products.
Intergranular corrosion tests per ASTM A262 Practice C/E.
Mill Test Certificates (MTC) according to EN 10204 3.1 provided with every delivery batch.
Supplier Information (BELNADE)
Supplied by BELNADE, a globally trusted provider of high-grade superalloys and corrosion-resistant solutions. BELNADE offers customized cutting, non-destructive evaluation, and quick air/sea export logistics tailored to project deadlines.
Get in Touch with BELNADE for Quotes and Technical Inquiries
📧 Email: info@belnade-material.com
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