HFW U Bend Finned Tube ASME SA106 GR.B with Carbon Steel Fins For Waste Heat Boiler

HFW U Bend Finned Tube ASME SA106 GR.B with Carbon Steel Fins For Waste Heat Boiler

The A106 GR.B HFW U Bend Finned Tube refers to a specialized type of heat exchanger tube with specific material, manufacturing, and design characteristics.

Here's a breakdown of its components:

1. A106 GR.B

• Material Specification: ASTM A106 Grade B is a carbon steel pipe standard for high-temperature service.
• Properties: Good strength, weldability, and resistance to oxidation at elevated temperatures.

2. HFW (High-Frequency Welded)

• Manufacturing Process: The tube is formed from a steel strip and welded using high-frequency induction or resistance welding, ensuring a strong, consistent seam.
• Advantages: Cost-effective, good dimensional accuracy, and suitable for moderate pressures/temperatures.

3. U Bend

• Design Feature: The tube is bent into a U-shape, allowing compact heat exchanger designs (common in shell-and-tube heat exchangers).
• Purpose: Facilitates thermal expansion/contraction and simplifies tube bundle assembly.

4. Finned Tube

• Enhanced Heat Transfer: Fins (either externally attached or integrally formed) increase the surface area, improving heat exchange efficiency.
• Applications: Used in air-cooled heat exchangers, boilers, or economizers where gas-to-liquid heat transfer is needed.

Key Considerations

• Temperature/Pressure Limits: A106 GR.B is suitable for moderate conditions (up to ~450°C).
• Fin Types: Could be helical, longitudinal, or serrated, depending on the application.
• Bend Radius: Critical to avoid deformation; typically customized per design requirements.

Chemical Composition of ASTM A106 Grade B (Weight %)

Notes:

A106 Gr. B is a carbon steel pipe with no significant alloying elements.

Silicon must be ≥ 0.10% for deoxidation.

Residual elements (Cr, Cu, Mo, V) are limited if specified for weldability.

Mechanical Properties of ASTM A106 Grade B

Notes:

Elongation varies with wall thickness (thinner pipes may have higher elongation).

Suitable for high-temperature service (up to 450°C / 840°F).

Commonly used in power plants, refineries, and boilers.

Comparison with Other Grades (A106 Gr. A & C)

Key Applications of A106 Gr. B Finned Tubes

1. Heat Exchangers & Boilers

• Shell-and-Tube Heat Exchangers:

The U-bend design allows thermal expansion/contraction, reducing stress in fixed-tube setups

Fins enhance heat transfer between fluids (e.g., hot flue gas → water/steam).

• Waste Heat Recovery Units (WHRU):

Captures waste heat from exhaust gases (e.g., in refineries, chemical plants).

• Economizers:

Preheats boiler feedwater using flue gas, improving energy efficiency in power plants.

2. Power Generation

• Air-Cooled Condensers (ACC):

Finned tubes dissipate heat from steam to air (common in dry-cooling power plants).

• Superheaters & Reheaters:

A106 Gr.B’s high-temperature resistance suits steam generation (up to 450°C).

3. Petrochemical & Oil Refining

• Process Heaters:

Transfers heat to hydrocarbons in cracking units or distillation columns.

• Crude Oil Preheaters:

Uses finned tubes to heat crude oil before distillation, reducing viscosity.

4. HVAC & Industrial Heating

• Thermal Oil Heaters:

Circulates hot oil through finned tubes for uniform heating in industrial processes.

• Drying Systems:

Finned tubes accelerate heat transfer in air dryers (e.g., paper, food processing).

5. Renewable Energy Systems

• Biomass Boilers:

Resists corrosion from flue gases while maximizing heat recovery.

• Solar Thermal Plants:

Auxiliary heating with finned tubes ensures consistent energy output.

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Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

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Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube, KL type fin tube), Embedded G type fin tube , Extruded fin tube, low fin tube, U bend & 180deg. Return;

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