ASME SB564 Monel 400 (UNS NO4400, 2.4360) Nickel Alloy Long Weld Neck Flange
What is long weld neck flange?
A Long Weld Neck Flange is an integral self-reinforcing Flange connection primarily for ASME Pressure Vessel applications. The Long Weld Neck (LWN) Flange was designed to be used in place of a Weld Neck Flange and piece of pipe for a bolt up connection to the vessel.
Monel 400 Flanges is a nickel-copper alloy (about 67% Ni – 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength.
A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress-corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions.
This nickel alloy is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. As would be expected from its high copper content, alloy 400 is rapidly attacked by nitric acid and ammonia systems.
The functionality of the Astm B564 Monel Pipe Flange is so great that its mechanical properties remain unaffected despite exposure to a temperature as high as 1000° F.
Monel 400 Chemical Composition:
| Grade | C | Mn | Si | S | Cu | Fe | Ni |
| Monel 400 | 0.30 max | 2.00 max | 0.50 max | 0.024 max | 28.00 – 34.00 | 2.50 max | 63.00 min |
Long Weld Neck Flange Specification:
| Standard | Type | Class | Size |
| ASME B16.5 | WN/LWN/SO/Blind/Lap Joint | 150#-2500# | 1/2"-24"(Except Blind Flange 2500lb 1/2"-12") |
| Sealing Surface | RF FF RTJ TF GF LF LM |
| Flange Face Finish | Stock Finish/Spiral Serrated/Concentric Serrated/Smooth Finish(Ra 3.2 and 6.3 micrometers) |
| 125-250 AARH(it is called smooth finish) |
| 250-500 AARH(it is called stock finish) |
| Coating | Vanish, yellow paint, anti-rust oil, galvanizing etc |
Mechanical properties :
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Monel 400 | 8.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80,000 , MPa – 550 | Psi – 35,000 , MPa – 240 | 40 % |
Equivalent Grades of Monel 400 Flanges:
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| Monel 400 | 2.4360 | N04400 | NW 4400 | NA 13 | МНЖМц 28-2,5-1,5 | NU-30M | NiCu30Fe |
Monel 400 Flanges Applications:
-Sea water applications
-Chemical plant equipment
-Aerospace applications
-Heat exchangers
-High pressure applications
-Offshore applications
-Onshore applications
-Welded pressure vessels for the storage of cryogens
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ASME SB564 Monel 400 (UNS N04400, 2.4360) Nickel Alloy Long Weld Neck Flange Images
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