ASME B16.5 A182 F9 Flange
The ASME B16.5 A182 F9 Flange is a high-temperature, high-pressure flange compliant with the ASME B16.5 standard, manufactured from ASTM A182 F9 chromium-molybdenum alloy steel (9Cr-1Mo), specifically designed for extreme high-temperature environments.
High Quality ASME B16.5 A182 F9 Flange
- Pressure Ratings Class 150/300/600/900/1500/2500
- Size Range NPS ½” to 24″ (ASME B16.5 standard)
ASME B16.5 A182 F9 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 F9)
| Parameter | Value/Range |
| Chemical Composition | Cr: 8-10%, Mo: 0.9-1.1%, C≤0.15% |
| Tensile Strength | ≥585 MPa |
| Yield Strength | ≥380 MPa |
| Hardness (HB) | ≤201 |
| Pitting Resistance Equivalent (PREN) | ≥18 (corrosion resistance indicator) |
| Heat Treatment | Normalizing (950–1050°C) + Tempering (730–790°C) |
Selection Recommendations
Preferred Applications:
- Long-term operation in 550–650°C steam/non-corrosive gas pipelines.
- High oxidation resistance requirements with budget constraints (compared to nickel-based alloys).
Alternative Solutions:
- Supercritical power plants (>625°C): Use F91 or nickel-based alloys (Inconel 625).
- Chloride-containing environments: Switch to duplex steel (F51/F53).
Usage Guidelines
Welding Requirements:
- Filler Material: Use E505-15 or ER505 filler materials, with a preheating temperature of 250–350°C.
- Post-Weld Heat Treatment (PWHT): Mandatory tempering at 730–790°C to avoid brittle phase formation.
Corrosion Protection:
- Suitable for: High-temperature oxidizing environments (e.g., steam).
- Not recommended for: Sulfur-containing or reducing acidic media.
Inspection Standards:
- Required documents: Material Test Certificate (MTC) and Impact Test Report (if applicable).
Typical Applications
High-Temperature and High-Pressure Systems:
- Power plant boiler superheaters/reheaters (steam temperature ≥540°C).
- Petrochemical cracking furnaces, high-temperature reactors.
Industrial Equipment:
- Heat treatment furnace piping, high-temperature hot air systems.
- Delayed coking unit pipelines.
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More Information about ASME B16.5 A182 F9 Flange
ASME B16.5: An international standard for pipe flanges established by the American Society of Mechanical Engineers (ASME), specifying dimensions, pressure ratings (Class 150–2500), tolerances, and manufacturing requirements.
ASTM A182 F9: A 9% chromium-1% molybdenum alloy steel (9Cr-1Mo), specifically designed for high-temperature oxidation and creep resistance environments, suitable for extreme operating conditions.
Advantages and Disadvantages Analysis
| Advantages | Disadvantages |
| ✅ Excellent High-Temperature Performance: Oxidation resistance (≤700°C) and superior creep resistance, suitable for long-term high-temperature operation. | ❌ High Cost: More expensive compared to carbon steel (e.g., A105) and low-alloy steels (e.g., F11/F22). |
| ✅ Strength Retention: Maintains high mechanical strength at 550–650°C. | ❌ Complex Welding Requirements: Requires strict preheating (250–350°C), specialized filler materials (e.g., E505), and post-weld heat treatment. |
| ✅ Steam Corrosion Resistance: Ideal for high-pressure steam pipelines with long service life. | ❌ Poor Sulfur/Acid Resistance: Not suitable for sulfur-, chloride-, or highly acidic environments. |
| ✅ Lightweight Design: Lighter than comparable high-temperature alloys (e.g., nickel-based alloys). | ❌ Difficult Machining: Requires carbide tools for cutting and preheating for cold bending to prevent cracking. |
Pressure–Temperature Ratings for A182 Gr. F9
Comparison with Other High-Temperature Flanges
| Property | F9 (9Cr-1Mo) | F22 (2.25Cr-1Mo) | F91 (9Cr-1Mo-V-Nb) |
| Maximum Temperature | 650°C | 600°C | 625°C |
| Oxidation Resistance | Excellent (≤700°C) | Moderate | Good (vanadium/niobium strengthened) |
| Cost | High | Moderate | Highest |
| Welding Difficulty | Requires strict temperature control | Moderate | Very high (requires specialized filler materials) |
FAQ
- F9 (9Cr-1Mo): Suitable for pure high-temperature oxidation environments (e.g., boiler superheaters), lower cost, but maximum temperature resistance is 650°C.
- F91 (9Cr-1Mo-V-Nb): Enhanced with vanadium/niobium for better creep resistance, ideal for supercritical power plants (>625°C), but more expensive.
Not recommended! Sulfides can cause high-temperature sulfur corrosion. Use 5Cr-0.5Mo (F5) or stainless steel (F316H) instead.
- Filler Material Matching: Must use E505-15/E505-16 electrodes or ER505 filler wire.
- Preheating Control: Maintain interpass temperature at 200–350°C to prevent cold cracking.
- Post-Weld Heat Treatment (PWHT): Temper at 730–790°C to relieve residual stresses and restore toughness.
- Higher temperatures (>700°C): Use nickel-based alloys (Inconel 625/617).
- Chloride/acidic environments: Switch to duplex steel (F51/F53) or super austenitic stainless steel (254SMO).
Mandatory Tests:
- Chemical composition analysis (ensure Cr, Mo content meets standards).
- Hardness testing (HB ≤201).
- Metallographic examination (no δ-ferrite precipitation).
Optional Tests:
- High-temperature creep testing (for long-term high-temperature applications).
For detailed dimension tables, supplier quotations, or technical documentation, please provide:
- Media type (e.g., steam, oil/gas composition).
- Operating temperature/pressure profile.
- Connected piping material (e.g., P9/T9 steel pipes).
📞 Technical Support: Available for material selection consultation and rapid quotations!
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