Incoloy 825 Nickel Alloy Round Bar (UNS N08825, EN 2.4858) made of a premium nickel-iron-chromium alloy engineered for exceptional resistance to corrosion and high-temperature environments. With a balanced composition of nickel (38.0–46.0%), chromium (19.50–23.50%), and additions of molybdenum and copper, this alloy combines the best of oxidation resistance, stress corrosion cracking (SCC) resistance, and mechanical strength.
Manufactured to rigorous standards including ASTM B425, B160, and B164, Incoloy 825 round bars undergo precision processing to ensure uniform microstructure, dimensional accuracy, and superior surface finish. The alloy’s unique chemistry makes it a go-to solution for industries where exposure to aggressive acids, saltwater, and high temperatures is unavoidable, offering unparalleled durability in challenging environments.
Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. delivers Incoloy 825 round bars that meet the highest quality benchmarks, providing customers with reliable materials for critical components and structures.
| Grade | C | Mn | Si | S | Cr | Ni | Fe | Cu | Mo | Ti | Al |
| Incoloy 825 | ≤0.05 | ≤1.00 | ≤0.50 | ≤0.03 | 19.50–23.50 | 38.0–46.0 | ≥22.0 | 1.50–3.00 | 2.50–3.50 | 0.60–1.20 | ≤0.20 |
| Property | Value |
| Density | 8.14 g/cm³ |
| Melting Point | 1370–1400°C |
| Tensile Strength | ≥550 MPa (80,000 psi) |
| Yield Strength (0.2% offset) | ≥220 MPa (32,000 psi) |
| Elongation | ≥30% |
| Hardness (HB) | ≤195 |
| Property | Value |
| Thermal Conductivity | 15.1 W/m·K (100°C) |
| Electrical Resistivity | 103 μΩ·cm |
| Coefficient of Thermal Expansion | 13.3 μm/m·°C (20–100°C) |
| Elastic Modulus | 200 GPa |
Incoloy 825 demonstrates superior resistance to a wide range of corrosive media:
Sulfuric & Phosphoric Acids: Performs well in both oxidizing and reducing conditions, making it ideal for acid processing.
Chloride Environments: Resistant to SCC in saltwater and brine solutions, a critical advantage in marine and offshore applications.
Seawater & Brackish Water: Unaffected by pitting and crevice corrosion, suitable for desalination plants and marine hardware.
Maintains mechanical properties up to 650°C, ensuring reliability in heat exchangers and furnace components.
Resists oxidation and carburization in high-temperature service, making it suitable for continuous use in thermal cycling environments.
Balances high tensile strength (≥550 MPa) with excellent ductility (≥30% elongation), allowing for complex machining and forming.
Retains toughness at low temperatures, making it suitable for cryogenic applications.
Readily weldable by TIG, MIG, and stick welding methods without preheating.
Minimal risk of carbide precipitation in heat-affected zones, ensuring post-weld corrosion resistance.
Machinable with standard tools, though slow speeds and high lubrication are recommended for optimal results.
Offshore Drilling: Subsea pipelines, wellheads, and production equipment exposed to saltwater and corrosive hydrocarbons.
Refining: Heat exchangers, reactors, and piping for processing high-sulfur crude oils.
Chemical Injection Systems: Components for handling acidic fluids in enhanced oil recovery (EOR) processes.
Acid Production: Equipment for manufacturing sulfuric, phosphoric, and acetic acids.
Fertilizer Plants: Reactors and vessels for phosphate and nitrogen-based fertilizer production.
Pharmaceutical Manufacturing: Corrosion-resistant components for handling aggressive chemical intermediates.
Flue Gas Desulfurization (FGD): Scrubbers, ducts, and heat exchangers in coal-fired power plants.
Geothermal Energy: Tubing and valves for high-temperature, acidic brine systems.
Nuclear Facilities: Components in spent fuel processing and radioactive waste handling.
Desalination Plants: Heat exchangers, pumps, and pipelines in seawater reverse osmosis (SWRO) systems.
Marine Engineering: Shipboard equipment, offshore platforms, and coastal structures.
Bleaching Processes: Digesters, chlorine dioxide reactors, and bleach plant piping.
Chemical Pulping: Equipment for handling sulfurous acids and alkaline solutions.
Composition: Incoloy 825 contains molybdenum (2.50–3.50%) and copper (1.50–3.00%), while Incoloy 800 lacks these elements.
Corrosion Resistance: 825 offers better resistance to reducing acids and chloride-induced SCC, while 800 is optimized for high-temperature oxidation resistance.
Applications: 825 is ideal for acidic environments, whereas 800 suits high-temperature, low-corrosion settings like furnace parts.
Incoloy 825 performs best in reducing acids. For nitric acid (oxidizing), consider alloys like Incoloy 800 or 316 stainless steel for better resistance.
Incoloy 825 maintains corrosion resistance up to 650°C in continuous service. For short-term exposure, it can withstand temperatures up to 980°C.
No, Incoloy 825 is non-magnetic, making it suitable for applications where magnetic interference is a concern, such as in sensors or medical equipment.
Use nickel-based filler metals (e.g., ERNiCrMo-3) and low heat input to minimize thermal stress. Post-weld heat treatment is rarely needed, but annealing can improve ductility for critical components.
Standard pickling or passivation is sufficient for most applications. Polishing can be applied for aesthetic purposes or to enhance corrosion resistance in hygienic environments.
All products come with mill test certificates. Additional certifications include:
EN 10204 3.1B
Raw Materials Certificate
100% Radiography Test Report
Third-Party Inspection Report (on request)
NACE MR0175 compliance (available upon request)
