ASTM A106 Gr.B HFW Solid Finned Tube with CS Fins for Process Gas Heaters

ASTM A106 Gr.B HFW Solid Finned Tube with CS Fins for Process Gas Heaters

ASTM A106 GR.B HFW Solid Finned Tube with Carbon Steel Fins is a high-performance pipe designed for efficient heat transfer in high-pressure, high-temperature applications, like those found in boilers, heaters, and heat exchangers.

Here is a detailed description:

1. Base Tube Material: ASTM A106 Gr.B

(1) ASTM A106 Grade B - Chemical Composition

The chemical composition is specified by ASTM A106 and is given in maximum percentage weight.

Note: The sum of Cr, Cu, Mo, Ni, and V shall not exceed 1.00%.

(2) ASTM A106 Grade B - Mechanical Properties

The mechanical properties are the minimum required values.

Elongation Requirements:
The minimum elongation is dependent on the specimen's wall thickness and is calculated by the formula:

On 2-inch (50.8 mm) gauge length: Elongation min % = 1000 x (A)^0.2 / U^(0.9)
where A is the cross-sectional area of the tensile specimen and U is the specified tensile strength.

A simplified table for common sizes is often referenced:

2. HFW (High-Frequency Welded)

This describes the manufacturing process of the fins.

HFW is a highly precise electrical resistance welding process.

A carbon steel strip is fed continuously and formed into fins.

A high-frequency electrical current is applied to the point where the fin base contacts the core A106 tube. This current heats the metals to a forging temperature instantly.

Pressure is then applied, fusing the fin to the tube metallurgically (creating a molecular bond), not just mechanically.

Advantages: This creates an extremely strong, durable bond with excellent heat transfer efficiency. The weld is clean, narrow, and has a minimal heat-affected zone, preserving the strength of the base materials.

3. Carbon Steel Fins

Using carbon steel fins on a carbon steel base tube (A106) ensures thermal expansion coefficients are matched. This means both the tube and fins will expand and contract at the same rate when heated and cooled, preventing stress, loosening, or failure at the bond.

An ASTM A106 Gr.B HFW Solid Finned Tube with Carbon Steel Fins is a seamless carbon steel pressure pipe with solid carbon steel fins attached via a high-frequency welding process to create a high-integrity, high-efficiency heat transfer component.

4. Why This Specific Combination is Chosen?

The selection of this exact specification is deliberate for these harsh environments:

Key Application Areas

This specific type of finned tube is a premium product and is typically found in critical industrial settings:

1. Power Generation

• Heat Recovery Steam Generators (HRSGs): These are the massive units behind gas turbines in combined-cycle power plants. They capture exhaust gas (as high as 600°C) to produce steam that drives a steam turbine. The high pressure and temperature of the steam inside the tubes require a seamless grade like A106 Gr.B.
• Economizers: A boiler component that preheats the feedwater using leftover heat from the flue gas. This improves the plant's overall efficiency.
• Air Heaters: Preheats the combustion air entering the boiler furnace by using heat from the exiting flue gas. This significantly improves combustion efficiency.

2. Petrochemical & Refining Industries

• Process Gas Heaters: Heats process gases (e.g., hydrocarbon streams) to required reaction temperatures in furnaces. The internal pressure of the process fluid can be very high.
• Waste Heat Recovery Units: Captures heat from chemical processes or furnace exhausts to generate steam or preheat other fluids, reducing fuel consumption and operating costs.

3. Other Heavy Industries

• Industrial Boilers: Used in various sections of large industrial boiler systems where enhanced heat transfer from combustion gases is needed.
• Cement & Metallurgical Plants: Used in waste heat recovery systems to capture energy from extremely hot kiln or furnace exhaust gases.