ASTM B564 UNS N04400 Weld Neck Flange Monel 400 Flange Nickel Copper Alloy WNRTJ Flange
ASTM B 564 UNS N04400 / Monel 400 WNRTJ Flange Nickel-Cooper Alloy Weld Neck Flange
This is a high-integrity, forged pipe connector manufactured from Nickel-Copper Alloy UNS N04400 (Monel 400) under ASTM B564 forging specifications. It features a long tapered hub (Weld Neck) designed for butt-welding to the pipe, combined with a Ring Type Joint (RTJ) grooved face—engineered to accept a solid metallic gasket for a critical, metal-to-metal seal in extreme-pressure and highly corrosive industrial services.
- Excellent Resistance to: Seawater, brackish water, hydrofluoric acid, sulfuric acid (reducing conditions), and neutral salts.
- High Resistance to: Stress-corrosion cracking (SCC) in chlorides.
- Caution: Not recommended for oxidizing acids (e.g., nitric acid) or heavily oxidizing conditions where passivity breaks down.
Equivalent Material of ASTM B564 UNS N04400 Nickel Alloy Flange
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Monel 400 | N04400 | 2.4360 | NU-30M | NiCu30Fe | NW 4400 | NA 13 | ----- 28-2,5-1,5 |
Chemical Properties % of ASTM B564 Monel 400 Flange UNS N04400 Nickel-Copper Alloy Flange
| Monel 400 | Ni | C | Al | Mn | Si | Fe | Cu | S | Co | Cr |
| 63.0 min | 0.3 max | 0.50 max | 2.0 max | 0.5 max | 1.0 – 2.5 | 28.0 – 34.0 | 0.02 max | – | – |
Mechanical Characteristics of ASTM B564 Monel 400 Flange UNS N04400 Nickel-Copper Alloy Flange
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.8 g/cm3 | 1350 °C (2460 °F) | Psi - 35,000 , MPa - 240 | Psi - 80,000 , MPa - 550 | 40 % |
Manufacturing & Heat Treatment
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Forging Process: The billet is heated and forged to refine the grain structure.
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Heat Treatment: Annealed at 1,300 – 1,600 °F (704 – 871 °C) followed by rapid cooling (water quench) to ensure consistent grain size and optimal corrosion resistance.
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Machining: RTJ grooves must be machined to a specific roughness (generally 63–125 Ra microinches) to ensure proper gasket seating.
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NDE (Non-Destructive Examination): Usually subjected to Liquid Penetrant (PT) or Magnetic Particle (MT) inspection as per ASME Section V, often with 100% visual and dimensional checks.
Application
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Marine Engineering: Offshore platforms, shipbuilding (seawater piping).
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Chemical/Petrochemical: HF alkylation units, sour gas processing (H₂S).
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Oil & Gas: Wellhead equipment, Christmas trees, high-pressure manifolds.
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Aerospace & Power: Fuel tanks, feedwater heaters.
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