ASTM B163 N08825 Extruded Fin Tube for Fired Heater and Furnance

ASTM B163 N08825 Extruded Fin Tube Chemical Composition

ASTM B163 N08825 Extruded Fin Tube FAQ

1. What is ASTM B163 N08825?

• ASTM B163 is a standard specification for seamless nickel and nickel alloy condenser and heat-exchanger tubes.
• N08825 (Incoloy 825) is a nickel-iron-chromium alloy with additions of molybdenum and copper, designed for corrosion resistance in a wide range of environments.

2. What are the key properties of N08825?

• Corrosion Resistance: Excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking, and pitting.
• High Temperature Strength: Good mechanical properties at elevated temperatures.
• Oxidation Resistance: Resists oxidation and carburization at high temperatures.
• Weldability: Can be welded using common welding techniques.

3. What are the advantages of using ASTM B163 N08825 extruded fin tubes?

• Enhanced Heat Transfer: The fins increase the surface area, improving heat transfer efficiency.
• Corrosion Resistance: Suitable for harsh environments, including those with acidic and corrosive media.
• Durability: High strength and resistance to thermal fatigue make them suitable for high-temperature applications.
• Long Service Life: The material's resistance to corrosion and oxidation extends the lifespan of the tubes.

4. What are the typical applications of ASTM B163 N08825 extruded fin tubes?

• Chemical Processing: Heat exchangers, condensers, and reactors in corrosive environments.
• Petrochemical Industry: Used in refineries and petrochemical plants for heat recovery and process heating.
• Power Generation: Condensers and heat exchangers in power plants.
• Marine Applications: Heat exchangers in seawater environments due to excellent corrosion resistance.

5. What are the manufacturing standards for ASTM B163 N08825 extruded fin tubes?

• Material Composition: Must comply with the chemical composition requirements for N08825.
• Mechanical Properties: Must meet the tensile strength, yield strength, and elongation requirements specified in ASTM B163.
• Dimensional Tolerances: Must adhere to the dimensional standards for seamless tubes and fin dimensions.
• Testing and Inspection: Includes non-destructive testing (NDT), hydrostatic testing, and visual inspection to ensure quality and integrity.

6. What are the considerations for selecting ASTM B163 N08825 extruded fin tubes?

• Operating Environment: Consider the chemical composition, temperature, and pressure of the operating environment.
• Heat Transfer Requirements: Ensure the fin design meets the heat transfer efficiency needs.
• Mechanical Strength: Verify that the tube can withstand the mechanical stresses of the application.
• Compliance with Standards: Ensure the tubes meet the relevant industry standards and specifications.

7. How do you maintain ASTM B163 N08825 extruded fin tubes?

• Regular Inspection: Periodic inspection for signs of corrosion, erosion, or mechanical damage.
• Cleaning: Regular cleaning to remove fouling and deposits that can reduce heat transfer efficiency.
• Monitoring: Continuous monitoring of operating conditions to detect any deviations that could affect tube performance.

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