Special Products
Inconel 825
Inconel 825 is a titanium-stabilised, fully austenitic nickel-iron-chromium alloy with added molybdenum, copper, and titanium. It offers exceptional resistance to both reducing and oxidizing acids, stress-corrosion cracking, pitting, and crevice corrosion. Inconel 825 is widely used in chemical processing, nuclear fuel reprocessing, and pollution control applications, particularly where strong corrosion resistance is required in aggressive environments.
Key Features
- Corrosion Resistance: Excellent resistance to sulfuric, phosphoric, nitric, and organic acids, as well as alkalis.
- Oxidation Resistance: Protects against both oxidizing and reducing conditions.
- Stress-Corrosion Cracking Resistance: Maintains structural integrity in chloride-rich and acidic conditions.
- Good Mechanical Strength: Retains strength and toughness at both room and elevated temperatures.
- Stabilized with Titanium: Improves resistance to sensitization and intergranular corrosion after welding.
Chemical Composition
Element | Composition (%) |
Nickel (Ni) | 38.0 – 46.0 |
Chromium (Cr) | 19.5 – 23.5 |
Iron (Fe) | Balance |
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 |
Aluminum (Al) | ≤ 0.2 |
Sulfur (S) | ≤ 0.03 |
Mechanical Properties
Property | Value |
Tensile Strength | ≥ 585 MPa |
Yield Strength (0.2% Offset) | ≥ 220 MPa |
Elongation | ≥ 30% |
Hardness | ~150 HB |
Operating Temperature Range | -196°C to 540°C |
Applications
- Chemical Processing: Heat exchangers, tanks, and piping in sulfuric and phosphoric acid service.
- Marine Industry: Piping and components exposed to seawater and harsh marine environments.
- Pollution Control: Scrubbers, stack liners, and ducting systems for flue gas desulfurization.
- Nuclear Fuel Reprocessing: Handling of radioactive and acidic materials.
- Oil & Gas: Sour gas well components, piping systems, and heat exchangers.
Forms Available
- Sheets & Plates: Used in high-temperature structural components and cladding applications.
- Bars & Rods: Ideal for machining into custom components for aerospace and oil & gas sectors.
- Pipes & Tubes: Employed in high-pressure fluid transport systems across the power and chemical industries.
Equivalent Grades
Standard | Equivalent Grade |
UNS | N08825 |
W.Nr | 2.4858 |
ASTM | B424, B705, B564 |
ASME | SB-424, SB-705, SB-564 |
Advantages
- Broad corrosion resistance in diverse acidic environments.
- Excellent fabrication and weldability characteristics.
- Maintains mechanical properties across a wide temperature range.
- Strong resistance to localized corrosion and intergranular attack.
Surface Finish and Coatings
To enhance durability:
- Standard finishes include polished or pickled surfaces.
- Coatings such as epoxy or anti-corrosion layers can be applied for specific requirements.
Quality Assurance & Packaging
High-quality standards are maintained throughout the manufacturing process:
- Certifications: Compliant with ASTM B424/B705/B564 and related standards.
- Packaging: Pipes and components are securely packaged with protective materials like wooden crates, plastic wrap, and end caps to prevent transit damage.
FAQ's
Products
Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry