Incoloy 825 Alloy, known for its high strength and corrosion resistance, is made of nickel-iron-chromium alloy and has applications in various demanding industries. Its chemical composition consists of nickel, iron, chromium, copper, molybdenum, and titanium, which have shown high resistance to both reductive and oxidative conditions. Applying this alloy enables it to be resistant to the temperatures and the chemical environments and therefore serves for chemical processing, nuclear fuel reprocessing, pollution control, and oil and gas industry. The chemical composition, mechanical properties, grades, and applications of this alloy should not be left out in a comprehensive table, chart and PDF document for designers and manufacturers. This includes guidance for evaluating the right alloy grade to suit specific working condition for best performance and long life in such demanding environments.
Incoloy Alloy 825 is made up of nickel-iron-chromium with addition of molybdenum, copper and titanium. The precise composition of its chemicals is painstakingly engineered for the best performance in corrosive environments. Grade Table of Incoloy Alloy 825 demonstrates all alloy composition showing that it is resistant to reducer and oxidizer acids. The alloy mainly consists of nickel, with a large relative amount of chromium and iron, which contributes to the alloy's exceptional resistance against stress corrosion cracking initiated by chloride. Molybdenum addition improves corrosion resistance under conditions of pitting and crevice corrosion, whilst copper confers greater resistance to sulfuric and phosphoric acid attack.
Elements | Ni | Cr | Mo | Cu | Ti | Fe | C | Mn | S | Si | Al |
---|---|---|---|---|---|---|---|---|---|---|---|
Min (%) | 38.0 | 19.5 | 2.5 | 1.5 | 6.0 | 22 | - | - | - | - | - |
Max (%) | 46.0 | 23.5 | 3.5 | 3.0 | 1.2 | 33 | 0.05 | 1.0 | 0.03 | 0.5 | 0.2 |
Advantages:
Versatile application: Suitable for use in various industries including chemical processing and marine engineering.
Excellent corrosion resistance: Highly resistant to both reducing and oxidizing environments.
High strength: Withstands high mechanical stresses at high temperatures.
Easy fabrication: Easier to fabricate and machine due to simple manufacturing process.
Disadvantages:
Susceptible to stress corrosion cracking: Prone to stress corrosion cracking under specific conditions.
Limited cold workability: Requires careful preparation prior to cold work compared to other alloys.
Thermal expansion: High coefficient of thermal expansion may require special attention in design and installation.
Cost: Price may be higher compared to some other materials.
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