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Incoloy 825 Corrosion-resistant Nickel Based Alloy Forgings

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Incoloy 825 alloy is a highly corrosion-resistant nickel based alloy with high Ni content, which has extremely high corrosion resistance to both oxidizing and non oxidizing acids.

Incoloy 825 alloy has excellent comprehensive corrosion resistance to both oxidizing and non oxidizing acids due to its high content of Cr, Mo, and Cu. Especially for sulfuric acid, it has extremely high corrosion resistance. Due to the high content of Cr, Mo, and Ni, it has excellent resistance to point corrosion, gap corrosion, and stress corrosion cracking in chloride environments. Incoloy 825 alloy controls the carbon content at an extremely low level, making it less susceptible to sensitization during welding and less sensitive to intergranular corrosion.

Chemical composition of Incoloy 825 alloy:

Nickel: 38.0% -46.0%

Iron (Fe): 22.0% -26.0%

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% max

Silicon (Si): 0.5% max

Carbon (C): 0.05% max

Phosphorus (P): 0.03% max

Sulfur (S): 0.03% max

Properties and characteristics of Incoloy 825 alloy

Density: 8.14 g/cm3

Melting point: 1370-1400 ℃

Incoloy 825 alloy has the following characteristics:

1. Good resistance to stress corrosion cracking

2. Good resistance to spot corrosion and crevice corrosion

3. Excellent antioxidant and non oxidative thermal acid properties

4. Excellent mechanical properties at room temperature and high temperatures up to 550 ℃

5. Certification for pressure vessels with manufacturing temperatures up to 450 ℃

Corrosion resistance of Incoloy 825 alloy:

825 alloy is a universal engineering alloy that has resistance to acid and alkali metal corrosion in both oxidizing and reducing environments. The high nickel content makes the alloy effective in resisting stress corrosion cracking. Good corrosion resistance in various media, such as sulfuric acid, phosphoric acid, nitric acid, and organic acids, as well as alkali metals such as sodium hydroxide, potassium hydroxide, and hydrochloric acid solutions. The high comprehensive performance of 825 alloy is reflected in the diverse corrosive media of nuclear combustion dissolvers, such as sulfuric acid, nitric acid, and sodium hydroxide, all treated in the same equipment.

The application scope of Incoloy 825 alloy includes:

825 alloy is widely used in various industrial fields where the operating temperature does not exceed 550 ℃.

Heating pipes, containers, baskets, and chains used in sulfuric acid pickling plants, seawater cooling heat exchangers, marine product pipeline systems, acidic gas environment pipelines, heat exchangers, evaporators, washing and impregnation pipes in phosphoric acid production, air heat exchangers in petroleum refining, food engineering and chemical processes, and flame retardant alloys for high-pressure oxygen applications.

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