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ASTM B163 INCOLOY 825 FIN TUBE With Aluminum Fin For Boiler
ASTM B163 is the standard specification for seamless nickel and
nickel alloy condenser and heat-exchanger tubes. It covers various
grades of nickel and nickel alloy tubes, including Incoloy 825.
Incoloy 825 is a nickel-iron-chromium alloy with additions of
molybdenum, copper, and titanium. It offers excellent corrosion
resistance in various environments, including highly oxidizing and
reducing conditions. Incoloy 825 is commonly used in applications
such as chemical processing, oil and gas, and marine environments.
A fin tube with aluminum fins is a type of heat exchanger tube that
has aluminum fins attached to its outer surface. The fins increase
the surface area of the tube, allowing for enhanced heat transfer
efficiency. Aluminum is commonly used for the fins due to its high
thermal conductivity and lightweight properties.
When used in boilers, ASTM B163 Incoloy 825 fin tubes with aluminum
fins provide efficient heat transfer and corrosion resistance. The
combination of Incoloy 825's corrosion resistance and aluminum's
thermal conductivity makes it suitable for high-temperature and
corrosive environments typically encountered in boiler
applications.
Mechanical Properties
| Temper | Annealed | |
| Tensile Rm | 85 | ksi (min) |
| Tensile Rm | 590 | MPa (min) |
| R.p. 0.2% Yield | 35 | ksi (min) |
| R.p. 0.2% Yield | 240 | MPa (min) |
| Elongation (2” or 4D gl) | 30 | % (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 440 | J.kg-1.°K-1 |
| Thermal Conductivity | 11.1 | W.m -1.°K-1 |
| Thermal Expansion | 14 | μm/μm/°C |
| Modulus Elasticity | 196 | GPa |
| Electrical Resistivity | 1.13 | Ohm-cm |
| Density | 8.13 | g/cm3 |
Chemical Composition (% by weight)
| Element | Min | Max |
| C | - | 0.05 |
| Si | - | 0.5 |
| Mn | - | 1 |
| P | - | 0.03 |
| S | - | 0.03 |
| Al | - | 0.2 |
| Cr | 19.5 | 23.5 |
| Cu | 1.5 | 3 |
| Fe | Balance | |
| Mo | 2.5 | 3.5 |
| N | 0.15 | 0.25 |
| Ni | 38 | 46 |
| Ti | 0.6 | 1.2 |
Application Of ASTM B163 INCOLOY 825 FIN TUBE With Aluminum Fin For Boiler
ASTM B163 specification covers seamless nickel and nickel alloy
condenser and heat-exchanger tubes with aluminum fin for boiler
applications. In this case, the application of ASTM B163 INCOLOY
825 fin tube with aluminum fin for boiler can provide several
benefits:
1. Corrosion Resistance: INCOLOY 825 is a nickel-iron-chromium
alloy with excellent resistance to various corrosive environments,
including acids, alkalis, and chloride solutions. This makes it
suitable for boiler applications where corrosion resistance is
crucial.
2. High Temperature Strength: INCOLOY 825 has good mechanical
properties at elevated temperatures, making it suitable for use in
boilers operating at high temperatures.
3. Heat Transfer Efficiency: The addition of aluminum fins to the
INCOLOY 825 tubes increases the heat transfer efficiency by
providing a larger surface area for heat exchange. This improves
the overall performance of the boiler system.
4. Cost-effective Solution: The combination of INCOLOY 825 and
aluminum fins offers a cost-effective solution for boiler
applications compared to other materials with similar corrosion
resistance and heat transfer properties.
5. Longevity: INCOLOY 825 has excellent resistance to stress
corrosion cracking and pitting, ensuring the longevity of the fin
tube in boiler applications.
6. Versatility: ASTM B163 allows for a wide range of tube diameters
and wall thicknesses, providing flexibility in design and
application for various boiler systems.
