Alloy 825 UNS N08825: Properties, Applications, and Performance Guide
Alloy 825 UNS N08825 Overview
Alloy 825 UNS N08825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. This versatile material offers exceptional resistance to corrosion, oxidation, and high temperatures, making it ideal for demanding industrial environments.
Chemical Composition and Mechanical Properties
The balanced chemical composition provides outstanding performance in both oxidizing and reducing conditions. Key mechanical properties include high tensile strength, excellent creep rupture strength, and good fabricability.
Industrial Applications
This alloy serves critical roles across multiple sectors:
Chemical Processing: Widely used in acid production, pickling tanks, and radioactive waste systems
Oil and Gas: Ideal for downhole components, heat exchangers, and offshore platform systems
Marine Engineering: Excellent performance in seawater handling systems and marine fasteners
Performance in Extreme Conditions
The material maintains structural integrity in temperatures ranging from cryogenic to 540°C (1000°F). Its nickel content ensures resistance to chloride-ion stress-corrosion cracking, while molybdenum provides protection against pitting and crevice corrosion.
Frequently Asked Questions
What makes Alloy 825 suitable for sulfuric acid applications?
The combination of nickel and molybdenum content provides exceptional resistance to sulfuric acid across various concentrations and temperatures.
How does it compare to stainless steel in marine environments?
Unlike standard stainless steels, Alloy 825 demonstrates superior resistance to seawater corrosion and chloride-induced stress corrosion cracking.
For detailed technical specifications and material certifications, explore our comprehensive Alloy 825 UNS N08825 resource page.
Optimizing Material Selection
When considering this alloy for your project, evaluate factors including operating temperature, corrosive media concentration, mechanical stress requirements, and fabrication methods. Proper selection ensures maximum performance and cost-effectiveness.
Fabrication and Welding Guidelines
The alloy can be readily formed and welded using standard techniques. Post-weld annealing is recommended to maintain optimal corrosion resistance in welded structures.
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