ASME B16.5 B564 UNS N04400 Flange
ASME B16.5 ASTM B564 UNS N04400 Flange is a high-end corrosion-resistant component manufactured under strict standards, designed for extreme corrosion, high-temperature, and high-pressure conditions.
High Quality ASME B16.5 B564 UNS N04400 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 B564 UNS N04400 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 B564 UNS N04400)
Material characteristics:
| Property | Value/Range | Notes |
| Nickel (Ni) | ~63% | Primary component |
| Copper (Cu) | 28-34% | Secondary component |
| Iron (Fe) | ≤2.5% | |
| Manganese (Mn) | ≤2.0% | |
| Silicon (Si) | ≤0.5% | |
| Carbon (C) | ≤0.3% |
Mechanical properties:
| Density | 8.80-8.84 g/cm³ | Slightly higher than stainless steel |
| Tensile Strength | 450-827 MPa (as processed) | Can reach ~1241 MPa after cold working |
| Yield Strength | 170-758 MPa | Improves significantly with cold work |
| Elongation | 30-50% | Excellent ductility and toughness |
| Temperature Resistance | Up to 600°C (continuous in air) | Corrosion rate <0.026 mm/a in steam |
Corrosion resistance:
N04400 performs exceptionally well in the following environments:
- Acidic Media: Resistant to sulfuric acid (≤85%), hydrofluoric acid, and hydrochloric acid (≤20%), making it one of the few materials capable of withstanding hydrofluoric acid.
- Alkaline Environments: Exhibits excellent resistance to hot concentrated alkalis (e.g., sodium hydroxide).
- Seawater and Brine: Resistant to chloride stress corrosion cracking, with a corrosion rate below 0.025 mm/a, commonly used in marine engineering equipment.
- High-Temperature Corrosion: Stable in anhydrous ammonia environments up to 585°C, suitable for nuclear industry equipment.
Selection and Usage Considerations
Selection Criteria:
- Match pressure class (e.g., Class 600+) with medium corrosivity, temperature, and pressure;
- Prefer RTJ sealing faces for high-pressure systems.
Installation & Maintenance:
- Use bolts of the same material (e.g., Monel 400) to avoid galvanic corrosion;
- Regularly inspect sealing faces; graphite or PTFE gaskets are recommended.
Typical Applications
The versatility of N04400 makes it widely applicable in several key industries:
- Marine Engineering: Seawater desalination equipment, pump shafts, propellers, and offshore platform structures.
- Chemical and Petrochemical: Reactors, heat exchangers, storage tanks, and pipelines for acid/alkali transport.
- Nuclear and Aerospace: Nuclear reactor cooling systems, aircraft engine components, and fuel systems.
- Energy and Shipbuilding: Oil drilling platforms, ship valves, and seawater cooling systems.
- Machining and Welding
- Machining Characteristics: Can be formed via cold/hot working; cold working significantly increases strength but requires attention to machining shrinkage allowances to maintain precision.
- Welding Processes: Compatible with TIG, MIG, and manual arc welding. Recommended filler materials include EniCu-7 or ERNiCu-7, with welded joint performance closely matching the base metal.
International Grade Equivalents
- United States: UNS N04400 (ASTM B164)
- Germany: 2.4360 (DIN)
- China: NS311 (GB)
- Japan: NW4400 (JIS).
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More Information about ASME B16.5 B564 UNS N04400 Flange
Design and Manufacturing
- Forming Process: Forging (as per ASTM B564), ensuring material density and mechanical properties;
- Pressure Ratings: Commonly Class 150 to Class 900, suitable for medium-to-high-pressure systems;
- Sealing Face Machining: High-precision turning ensures sealing reliability (e.g., RF face roughness Ra ≤3.2μm).
Performance Advantages
- Corrosion Resistance Lifespan: 5-10 times longer than standard stainless steel flanges in chloride or acidic environments;
- High-Temperature Stability: Strength retention >80% at 400°C, suitable for heat exchange systems;
- Cost-Effectiveness: Higher initial cost but lower maintenance frequency, offering better long-term value than carbon steel flanges.
Pressure–Temperature Ratings for B564 UNS N04400
FAQ
- Dimensional Compatibility: ASME B16.5 flanges do not directly match EN standard flanges and may require adapter rings or custom gaskets.
- Material Equivalence: UNS N04400 corresponds to the European standard 2.4360 (DIN), with nearly identical chemical composition and properties.
- Applicability: Performs well in wet hydrogen environments ≤260°C. For higher temperatures, Inconel 625 (UNS N06625) is recommended.
- Reference Standard: Follow ASME B16.5 based on design pressure/temperature (e.g., Class 300 ≈ 50 bar @ 100°C).
- Corrosion Allowance: Increase by 1-2 pressure classes (e.g., from Class 150 to Class 300) for corrosive media.
- Mandatory: Use Monel 400 or Inconel 600 bolts to prevent galvanic corrosion with carbon steel.
More Resources:
UNS N04400 flanges are ideal for harsh environments (acidic, seawater, high-temperature) but require strict compliance with ASME/ASTM standards. Selection should consider media properties, pressure-temperature profiles, and lifecycle costs. For budget-limited projects, 316L + anti-corrosion coatings may be used in non-critical sections.
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