ASME B16.5 B462 UNS N10276 Flange
ASME B16.5 B462 UNS N10276 flange is the ultimate solution for corrosive environments, especially in extreme conditions with both oxidizing and reducing media.
High Quality ASME B16.5 B462 UNS N10276 Flange
- Nominal Pipe Size (NPS): 1/2″ to 24″;
- Pressure Classes: Class 150 to Class 2500;
- Sealing Face Types: Raised Face (RF), Flat Face (FF), Ring Joint (RTJ), etc.
ASME B16.5 B462 UNS N10276 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 (ASME B16.5 B462 UNS N10276)
Composition:
- Nickel (Ni) 57%, Molybdenum (Mo) 15–17%, Chromium (Cr) 14.5–16.5%, Tungsten (W) 3–4.5%, Iron (Fe) 4–7%.
Core Properties:
Corrosion Resistance King: Resists pitting/crevice corrosion (in chlorides, seawater environments). Withstands strong oxidizing acids (nitric, concentrated sulfuric) and reducing acids (hydrochloric, hydrofluoric) in mixed media.
Mechanical Performance:
- Tensile strength ≥690 MPa, yield strength ≥283 MPa.
- Operating temperature range: -196°C to 1093°C (short-term up to 1150°C).
Selection and Usage Considerations
Pressure Rating Selection:
- Refer to ASME B16.5 Appendix D, e.g.:
- Class 150 flange at 100°C allows ≈2.0 MPa.
- Class 600 flange at 200°C allows ≈10.3 MPa.
Sealing Solutions:
- RF face: Paired with PTFE-coated graphite gaskets (best chemical compatibility).
- RTJ face: Use Inconel 718 metal ring gaskets (matches thermal expansion coefficient).
Welding Process:
- Filler metal: ERNiCrMo-4 (AWS A5.14 standard).
- Back purging with argon is mandatory to prevent oxidation.
Irreplaceable Application Fields
- Chemical: Wet metallurgy reactors, mixed acid (HCl+HNO₃) processing equipment.
- Environmental: Flue gas desulfurization (FGD) systems, wastewater treatment.
- Marine: Seawater desalination units, deep-sea pipelines.
- Pharmaceutical: High-purity API production equipment.
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More Information about ASME B16.5 B462 UNS N10276 Flange
Cost Optimization Suggestions
Alternatives (by cost):
- Hastelloy C22 (UNS N06022): 15% lower cost, similar corrosion resistance.
- Inconel 625 (UNS N06625): 30% lower cost, but lower Mo content, inferior HCl resistance.
- Lined flanges: Carbon steel base + C276 lining, up to 50% cost reduction.
Cost-Cutting Pitfalls:
- Avoid “imitation C276” (e.g., domestic NS334), which may fail in critical conditions.
Performance Comparison (N10276 vs. Other Premium Alloys)
| Property | Hastelloy C276 | Inconel 625 | Titanium Gr.2 |
| Hydrochloric Acid Resistance | Best (any concentration/temperature) | ≤10% concentration (room temp.) | Not applicable |
| Seawater Resistance | Excellent (resists pitting/crevice corrosion) | Good (but inferior to C276) | Excellent (must prevent galvanic corrosion) |
| Max Temperature | 1093°C (short-term) | 980°C | 300°C (long-term) |
| Cost | Highest (~10x stainless steel) | Moderate (~5x stainless steel) | High (~8x stainless steel) |
Pressure–Temperature Ratings for B462 UNS N10276
FAQ
- Its high molybdenum (Mo) content (16%) forms a stable passive film, resisting concentrated sulfuric acid (93%) and chloride-containing sulfuric acid.
- Yes, but note:
- Toughness decreases after neutron irradiation; periodic inspection is recommended.
- Prefer low-cobalt versions (Co <0.05%).
- Three-Step Verification:
- Spectrometry: Confirm Mo >15.5%, Cr >14.5%.
- Corrosion test: Immerse in 10% HCl at 50°C for 24 hours; genuine C276 weight loss <0.1 g/m²h.
- Certification check: ASTM B462 + NACE MR0175 dual certification.
More Resources:
The ASME B16.5 B462 UNS N10276 Flange is the premium choice for extreme corrosion environments, especially in applications with mixed oxidizing/reducing media (e.g., chemical processing, marine engineering).
Selection requires evaluating media composition, temperature, and cost, with failure mode analysis (FMEA) recommended for critical applications.
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