ASTM B366 WPNC Elbow UNS N04400 / Monel 400 Buttweld Pipe Fittings 90 Degree LR Elbow
Monel 400 Pipe Fittings , ASTM B366 uns n04400 / WPNC-WX Nickel Alloy 90 Degree LR Elbow
An ASTM B366 WPNC Elbow is a factory-made, wrought pipe fitting used to permanently change the direction of fluid flow in a piping system by 90 degrees. It is manufactured from Monel 400 (UNS N04400) nickel-copper alloy, adheres to the stringent material and testing requirements of the ASTM B366 standard, and features a Long Radius (LR) design (center-to-end dimension equal to 1.5 times the Nominal Pipe Size, or NPS). The ends are beveled for butt-welding directly to matching pipes. These elbows are typically manufactured via hot-forming (induction bending or pressing of seamless/welded pipe) followed by annealing and pickling to restore the optimal corrosion-resistant microstructure.
Equivalent Grades of ASTM B366 WPNC Elbow Monel 400 Buttweld Fittings
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Monel 400 | N04400 | 2.4360 | NU-30M | NiCu30Fe | NW 4400 | NA 13 | МНЖМц 28-2,5-1,5 |
Chemical Composition % of ASTM B366 WPNC Elbow Monel 400 Buttweld Fittings
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Monel 400 | 0.30 max | 2.00 max | 0.50 max | 0.24max | 28.0-34.0 | 2.50 max | 63.00 min | – |
Physical Properties and Mechanical Properties of ASTM B366 WPNC Elbow Monel 400 Buttweld Fittings
| 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 % |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.80 gm/cm3 | 0.318 lb/in3 |
If you have an ASTM B366 WPNC 90° LR Elbow, it is the perfect fit for:
A high-pressure, high-velocity seawater cooling line on an offshore oil platform, OR a hot concentrated caustic soda transfer line in a chemical plant, OR the hydrofluoric acid regeneration loop in an alkylation refinery unit, operating between -50°F and 750°F, where carbon steel would corrode within weeks and 316 stainless would crack from chlorides.
Applications
Because Monel 400 resists stress-corrosion cracking and is highly resistant to reducing acids, this specific elbow is used in critical, harsh environments, including:
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Marine Engineering: Shipbuilding and seawater cooling lines (resists biofouling and chloride pitting).
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Chemical Processing: Hydrofluoric acid (HF) alkylation units, chlorinated solvents, and sulfuric acid vessels.
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Oil & Gas: Sour gas service (resists sulfide stress cracking) and offshore platforms.
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Aerospace & Heat Exchangers: Fuel tanks and high-temp transfer lines.
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