180 Degree Return Bend ASTM B366 N06022 Hastelloy C-22 For Heat Exchanger

A 180 Degree Return Bend made of ASTM B366 N06022 Hastelloy C-22 is a pipe fitting used in piping systems to change the direction of flow by 180 degrees. The return bend is essentially a U-shaped component that causes the fluid to reverse its direction. This type of bend is often used for reversing the direction of piping in a compact area without using multiple fittings and straight pipes.

Here’s a detailed breakdown:

1. Chemical Composition of ASTM B366 N06022 (Hastelloy C-22) (Weight %)

Notes:

• Residual elements (Cu, Al, Ti, etc.) are typically limited to trace amounts.
• The composition ensures superior corrosion resistance in oxidizing and reducing environments.

2. Mechanical Properties of ASTM B366 N06022 (Hastelloy C-22)

Additional Notes:

• Heat Treatment: Solution annealed at 2050°F (1121°C) followed by rapid cooling for optimal corrosion resistance.
• Impact Toughness: Excellent (Charpy V-notch values typically > 100 J at room temperature).
• Density: ~8.69 g/cm³
• Melting Range: ~1350-1390°C (2462-2534°F)

Key Takeaways

✔ Corrosion Resistance: Excellent in chlorides, sulfuric acid, nitric acid, and seawater.
✔ High Strength: Maintains mechanical properties at elevated temperatures.
✔ Weldability: Good, but requires proper filler metals (e.g., ERNiCrMo-10).

3. 180-Degree Return Bend

• A U-shaped pipe fitting that allows flow to double back.
• Commonly used in heat exchangers, pipelines, and process systems.

4. ASTM B366 Specification

• Covers wrought nickel-alloy fittings (butt-welding, socket-welding, threaded).
• Includes requirements for chemical composition, mechanical properties, dimensions, and testing.

5. Manufacturing & Types

• Seamless or Welded: Can be fabricated via extrusion or bending from pipe.
• Butt-Weld Ends: Typically used for high-pressure/temperature systems.
• Dimensions: Follow ASME B16.9 (for factory-made bends) or custom specifications.

6. Key Features of ASTM B366 N06022 180 Degree Return Bend

• High-Temperature Strength: Retains properties in extreme conditions.
• Weldability: Compatible with common welding techniques (TIG, MIG).
• Surface Finish: Often supplied with a smooth finish to minimize contamination.
• Superior Corrosion Resistance: Outperforms stainless steel (316L) and even Hastelloy C-276 in mixed acid environments.

Primary Applications of Hastelloy C-22 180° Return Bend

1. Chemical Processing Industry

• Acid & Chloride Environments: Used in reactors, heat exchangers, and piping systems handling:
  • Sulfuric acid, hydrochloric acid, phosphoric acid.
  • Chlorine, bleach, and other aggressive chemicals.
• Pollution Control: Scrubbers, waste gas treatment, and effluent systems.

2. Oil & Gas (Including Offshore & Subsea)

• Downhole & Wellhead Components: Resists sour gas (H₂S), CO₂, and brine corrosion.
• Refinery Piping: Used in crude oil distillation, hydroprocessing, and sulfur recovery units.

3. Power Generation

• Flue Gas Desulfurization (FGD) Systems: Handles sulfuric acid condensates and chlorides in scrubbers.
• Nuclear Waste Processing: Resists radiation-induced corrosion and acidic nuclear byproducts.

4. Pharmaceutical & Food Processing

• High-Purity Systems: Used in CIP (Clean-in-Place) systems due to non-contaminating properties.
• Sterile Processing: Resists pitting from chlorinated sanitizers (e.g., hypochlorite).

5. Marine & Offshore

• Seawater Cooling Systems: Resists crevice corrosion and biofouling in heat exchangers.
• Desalination Plants: Used in brine heaters and evaporator tubing.

6. Pulp & Paper Industry

• Bleach Plants: Withstands chlorine dioxide and other harsh bleaching agents.