ASME B16.5 A182 F51 Flange
ASME B16.5 A182 F51 Flange is a flange that complies with the ASME B16.5 standard and is manufactured from ASTM A182 F51 duplex stainless steel, designed for highly corrosive environments (e.g., chloride-containing or acidic media) and high-strength applications.
High Quality ASME B16.5 A182 F51 Flange
- Pressure Ratings Class 150/300/600/900/1500/2500
- Size Range NPS ½” to 24″ (ASME B16.5 standard)
- Corrosion Resistance Resistant to chloride stress corrosion, seawater, dilute sulfuric acid, organic acids
- Temperature Range -50°C to 300°C (short-term up to 350°C)
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:
| Element | Cr | Ni | Mo | N | Mn | Si |
| F51 (UNS S31803/S32205) | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 | ≤2.0 | ≤1.0 |
Mechanical Properties:
- Tensile Strength: ≥620 MPa
- Yield Strength: ≥450 MPa
- Elongation: ≥25%
- Hardness (HB): ≤290
- Pitting Resistance Equivalent (PREN): ≥35 (PREN = %Cr + 3.3×%Mo + 16×%N)
Typical Applications
- Marine Engineering: Seawater desalination systems, ship piping.
- Chemical Industry: Chloride-containing media (e.g., brine, hydrochloric acid), acidic oil/gas pipelines.
- Oil & Gas: Offshore platforms, wells with H₂S/CO₂.
- Environmental Equipment: Wastewater treatment systems, flue gas desulfurization (FGD) units.
Usage Guidelines
Welding Process:
- Filler Material: Matched alloys like ER2209 (AWS A5.9) or E2209 (AWS A5.4).
- Heat Input Control: 0.5–1.5 kJ/mm; interpass temperature ≤150°C (to prevent σ-phase precipitation).
- No Post-Weld Heat Treatment: Avoid prolonged exposure to the 475°C embrittlement range.
Corrosion Protection:
- Avoid use in concentrated sulfuric acid (>40%) or hydrofluoric acid environments.
- Evaluate corrosion rates in strongly acidic (pH < 2) conditions.
Inspection Requirements:
- Metallographic Testing: Ensure duplex phase balance (≈50% austenite/50% ferrite).
- Pitting Test: ASTM G48 Method A (critical pitting temperature ≥25°C).
Typical Applications
- Marine Engineering: Seawater desalination systems, ship piping.
- Chemical Industry: Chloride-containing media (e.g., brine, hydrochloric acid), acidic oil/gas pipelines.
- Oil & Gas: Offshore platforms, wells with H₂S/CO₂.
- Environmental Equipment: Wastewater treatment systems, flue gas desulfurization (FGD) units.
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More Information about ASME B16.5 A182 F51 Flange
ASME B16.5: A pipe flange standard by the American Society of Mechanical Engineers (ASME), specifying dimensions, pressure ratings (Class 150–2500), and manufacturing requirements.
ASTM A182 F51:
Duplex stainless steel (UNS S31803/S32205) containing 22% chromium, 5% nickel, 3% molybdenum, and nitrogen, characterized by an austenitic-ferritic duplex microstructure that combines high strength and corrosion resistance.
Complies with ASTM A182/A182M, suitable for high-temperature and corrosive media environments.
Pressure–Temperature Ratings for A182 Gr. F51
Comparison with Other Stainless Steel Flanges
| Property | F51 (Duplex) | F304 (Austenitic) | F316L (Low-Carbon Austenitic) |
| Strength | High (≈2×316L) | Low | Moderate |
| Chloride Resistance | Excellent (resists pitting/Stress Corrosion Cracking) | Poor | Moderate |
| Cost | Higher | Low | Moderate |
| Weldability | Requires controlled heat input and interpass temperature | Easy to weld | Requires carbon control |
FAQ
- F53 (UNS S32750): Contains 25% Cr, 7% Ni, 4% Mo; PREN ≥40; higher strength and cost.
- F55 (UNS S32760): Adds tungsten (W); superior corrosion resistance for extreme environments.
Partially in chloride environments (e.g., seawater), but titanium outperforms above 300°C.
- Use carbide tools with low cutting speeds.
- Avoid overheating to maintain phase balance.
More Resources:
For dimension tables, supplier quotes, or corrosion test data, please provide:
- Media composition (Cl⁻ concentration, pH, temperature).
- Pressure rating and connected piping material (e.g., duplex steel pipe A790 S31803).
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