Incoloy 825 / UNS N08825 / 2.4858 / NiCr21Mo

Alloy Incoloy 825 / Alloy 825 / 2.4858: Properties, Applications, and Features

✅ General Technical Characteristics

The Incoloy 825 (Alloy 825, 2.4858) is a high-alloy nickel-based material with excellent corrosion resistance in aggressive environments. Due to its nickel, molybdenum, copper, and titanium content, it demonstrates outstanding resistance to acids, alkalis, and oxidation at high temperatures. This material is widely used in the chemical, petrochemical, and marine industries, as well as in the energy sector.

Main Characteristics:

• High corrosion resistance in acidic and chloride-containing environments.
• Excellent resistance to intergranular corrosion.
• Heat resistance and thermal stability at temperatures up to 550°C.
• Good mechanical strength and ductility.
• Excellent weldability and processing capabilities.

🔬 Chemical Composition of Incoloy 825 / Alloy 825 (%)

• Nickel (Ni): 38.0 – 46.0
• Iron (Fe): Balance
• Chromium (Cr): 19.5 – 23.5
• Molybdenum (Mo): 2.5 – 3.5
• Copper (Cu): 1.5 – 3.0
• Titanium (Ti): 0.6 – 1.2
• Manganese (Mn): ≤ 1.0
• Silicon (Si): ≤ 0.5
• Carbon (C): ≤ 0.05
• Phosphorus (P): ≤ 0.03
• Sulfur (S): ≤ 0.03

💡 The combination of nickel, chromium, and molybdenum ensures resistance to both oxidative and reducing corrosion environments.

🏭 Applications

The Incoloy 825 alloy is used in highly aggressive environments where superior corrosion and heat resistance are required.

Main Application Areas:

• Chemical and petrochemical industries (reactors, pipelines, heat exchangers).
• Marine industry (seawater treatment equipment, pumps, valves).
• Energy sector (boiler components, heat exchangers, nuclear plant piping).
• Oil and gas industry (pipelines, storage tanks for aggressive substances).
• Production of equipment for acidic gas and aggressive environment processing.

📊 Mechanical Properties

• Tensile Strength (Rm): ≥ 550 MPa
• Yield Strength (Rp0.2): ≥ 220 MPa
• Hardness (HB): ≤ 200 HB
• Elongation (A5): ≥ 30 %

⭐ Features

• Acid corrosion resistance – suitable for use in sulfuric, phosphoric, and nitric acids.
• Heat resistance – maintains mechanical properties at elevated temperatures.
• Excellent mechanical strength – withstands significant loads in aggressive conditions.
• High processability – easily weldable and suitable for both hot and cold processing.
• Durability – maintains stability and reliability even in extreme operating conditions.

Incoloy 825 Delivery Forms