ASME B16.5 A182 F22 Flange

ASME B16.5 A182 F22 Flange is a flange that conforms to the ASME B16.5 standard and is manufactured from ASTM A182 F22 chromium-molybdenum alloy steel. It is specifically designed for high-temperature, high-pressure, and hydrogen corrosion-resistant environments, widely used in petroleum, chemical, and power industries.

High Quality ASME B16.5 A182 F22 Flange

Temperature Range: -29°C to 600°C (short-term tolerance up to 650°C).
Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500.
Size Range: NPS ½” to 24″ (compliant with ASME B16.5 standards).

ASME B16.5 ASME B16.5 A182 F22 Flange

The ASME B16.5 standard covers various flange designs, including:

Weld Neck Flange: Preferred for high-pressure systems, connected via welding.
Slip-On Flange: Easy installation, suitable for low-pressure applications.
Blind Flange: Used to seal pipe ends.
Threaded Flange: Connected via threads, eliminating the need for welding.
Lap Joint Flange: Paired with stub ends for easy disassembly.

Material Properties (ASTM A182 F22)

Chemical Composition:

Carbon (C): ≤ 0.15%
Chromium (Cr): 1.90–2.60%
Molybdenum (Mo): 0.87–1.13%
Manganese (Mn): 0.30–0.60%
Silicon (Si): ≤ 0.50%

Mechanical Properties:

Tensile Strength: ≥ 515 MPa
Yield Strength: ≥ 310 MPa
Elongation: ≥ 20%
Heat Treatment: Requires normalizing + tempering (typically 900–960°C normalizing, 690–730°C tempering).

Typical Applications

Oil Refineries: Hydroprocessing units, high-pressure reactor pipelines.
Chemical Equipment: High-temperature and high-pressure systems in ammonia and methanol production.
Power Plants: High-temperature steam pipelines, boiler connections.
Hydrogen Environments: Hydrogen pipelines, hydrogen storage equipment.

Selection Considerations

Media Compatibility:

Suitable: Hydrogen, high-temperature steam, mildly acidic media.
Unsuitable: Strong acids (e.g., sulfuric acid), high-sulfur environments (consider F5/F9 or stainless steel).

Welding Process:

Filler Material: Low-hydrogen electrodes (e.g., E8018-B2).
Preheating: 200–300°C (to prevent cold cracking).
Post-Weld Heat Treatment: 690–730°C tempering (to relieve residual stresses).

Inspection & Maintenance:

Regularly inspect for creep damage and hydrogen embrittlement in high-temperature zones.
Recommended tests: hardness testing and metallographic analysis.

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More Information about ASME B16.5 A182 F22 Flange

ASME B16.5: A pipe flange standard established by the American Society of Mechanical Engineers (ASME), specifying dimensions, pressure ratings (Class 150–2500), tolerances, and testing requirements.

ASTM A182 F22: A 2.25% chromium-1% molybdenum alloy steel with excellent high-temperature creep and hydrogen corrosion resistance, suitable for high-temperature and high-pressure environments.

Pressure–Temperature Ratings for A182 Gr. F22

Working Pressures by Classes, bar

Working Pressures by Classes, psig

Working Pressures by Classes, bar

Working Pressures by Classes, psig

Comparison with Other Materials

Property	A182 F22	A105 (Carbon Steel)	A182 F5 (5Cr-0.5Mo)
Temperature Range	-29°C to 600°C	-29°C to 425°C	-29°C to 650°C
Corrosion Resistance	High (hydrogen corrosion resistance)	Low	High (sulfur corrosion resistance)
Creep Resistance	Excellent	Moderate	Moderate
Welding Requirements	Preheat (200–300°C) and post-weld heat treatment required	Standard welding	Preheat and post-weld heat treatment required

FAQ

Can F22 flanges be used in sulfur-containing environments?

Not recommended. F22 has limited sulfur corrosion resistance; consider A182 F5/F9 or stainless steel.

What is the difference between F22 and F91 flanges?

F91 (9Cr-1Mo-V-Nb) offers higher creep strength for supercritical power plants (≤625°C) but at a higher cost.

What are alternative materials to F22 flanges?

Higher temperatures (>600°C): A182 F9 (9Cr-1Mo) or F91.
Higher corrosion resistance: A182 F316L (stainless steel) or nickel alloys (Inconel 625).

More Resources:

For specific flange dimension tables, supplier recommendations, or corrosion test data, please provide application details (e.g., media composition, operating temperature/pressure)!