Incoloy 825 Flanges

what is an incoloy 825 flange?

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. It is known for its excellent resistance to corrosion in various environments, including both oxidizing and reducing acids, chloride-ion stress corrosion cracking, and pitting and crevice corrosion.

Incoloy 825 flanges are a type of fitting made from Incoloy 825 that are used to connect pipes or other equipment in a piping system. Flanges provide a method for joining pipes, valves, pumps, and other equipment to form a piping system. The use of Incoloy 825 flanges is ideal for applications where the piping system will be exposed to harsh corrosive environments. Incoloy 825 flanges are commonly used in chemical processing, oil and gas, marine engineering, and other industries where corrosion resistance is critical.

The equivalent material grades for Incoloy 825

The equivalent material grades for Incoloy 825 flanges may vary depending on the standard used. However, some of the commonly used equivalent grades are:

• ASTM B564 UNS N08825: This is the standard specification for nickel alloy forgings, including flanges, fittings, valves, and other components made from Incoloy 825.

• EN 2.4858: This is the European standard for Incoloy 825, which specifies the chemical composition, mechanical properties, and other requirements for the material.

• Alloy 825: This is the designation used by various manufacturers for Incoloy 825, which is a registered trademark of Special Metals Corporation.

• NA16: This is the designation used by the British Standards Institution (BSI) for Incoloy 825.

It is important to note that the choice of material grade for Incoloy 825 flanges should be based on the specific requirements of the application, including the temperature, pressure, and corrosive environment. The appropriate material grade should be selected in consultation with a qualified engineer or metallurgist.

Composition and Applications of  Incoloy 825

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. Its chemical composition is as follows:

• Nickel (Ni): 38.0 - 46.0%

• Iron (Fe): 22.0% min.

• 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.

• Carbon (C): 0.05% max.

• Silicon (Si): 0.5% max.

• Sulfur (S): 0.03% max.

• Phosphorus (P): 0.03% max.

  
  

Incoloy 825 is known for its excellent resistance to corrosion in a wide range of environments, including those containing sulfuric acid, phosphoric acid, and seawater. It is often used in chemical processing, pollution control, oil and gas recovery, and marine applications.

Specifications for Incoloy 825 flanges

The specifications for Incoloy 825 flanges may vary depending on the specific application requirements. However, the following are some common specifications for Incoloy 825 flanges:

1. Size: Incoloy 825 flanges are available in various sizes ranging from 1/2 inch to 48 inches or more.

2. Pressure rating: Incoloy 825 flanges are available in various pressure ratings such as class 150, class 300, class 600, class 900, class 1500, and class 2500.

3. Face type: Incoloy 825 flanges can be manufactured with various face types such as raised face (RF), flat face (FF), ring type joint (RTJ), and male and female (M&F).

4. Material: Incoloy 825 flanges are made from Incoloy 825 or a related alloy.

5. Standards: Incoloy 825 flanges are manufactured to various industry standards such as ASME/ANSI B16.5, ASME/ANSI B16.47, API, and DIN.

6. Coating: Incoloy 825 flanges can be coated with various materials such as PTFE, Xylan, and Teflon.

7. Connections: Incoloy 825 flanges can be connected to other equipment using various methods such as welding, threaded, or bolted.

Incoloy 825 vs Incoloy 825H

The main difference between the two alloys is the carbon content. Incoloy 825H has a higher carbon content than Incoloy 825. The higher carbon content in Incoloy 825H results in a higher tensile strength and yield strength compared to Incoloy 825.