Monel 400 Pipes & Pipe Fittings
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Monel 400 Pipes & Fittings Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier, importer, and stockist of Monel 400 pipes and fittings based in Mumbai, India. Every product supplied is manufactured from premium raw materials supplied in accordance with ASTM and ASME material specifications. We supply seamless pipes per ASTM B165 / ASME SB165, welded pipes per ASTM B725/B775, condenser tubes per ASTM B163, and buttweld fittings per ASTM B366.
Monel 400 is a nickel-copper binary alloy (63% Ni min, 28–34% Cu) that forms a single-phase, face-centred-cubic solid solution where nickel and copper are mutually soluble across the full range. This means no secondary phase precipitation, no sensitisation, and corrosion resistance that extends from HF acid service to flowing seawater, deaerated sulfuric acid, and caustic alkalis. It resists hydrofluoric acid at all concentrations up to the boiling point. Monel 400 is also known as UNS N04400 and Werkstoff 2.4360. It has a tensile strength of 482–586 MPa in the annealed condition. Yield strength is 172–310 MPa, and elongation is 35–50%. Stress-relieved tensile strength is 586–827 MPa. It doesn’t have a ductile-to-brittle transition even at liquid hydrogen temperature (–253°C).
Monel 400 pipe sizes range from NPS 1/2″ to 16″, SCH 5S through XXS. Buttweld fittings sizes range from NPS 1/2″ to 48″ (elbows, tees, reducers, caps, stub ends). Monel 400 pipes and fittings are NACE MR-01-75 listed for sour gas service. They are ASME BPVC approved.
Monel 400 Pipes & Fittings – Specifications
Specifications of Monel 400 (UNS N04400) pipes and fittings, including standards, dimensions, conditions, and other key specifications, are covered in the table below:
| Pipes Specifications | |
|---|---|
| Parameter | Details |
| Pipe & Tube Standards | ASTM B165, B725, B775, B163 / ASME SB165, SB725, SB775, SB163 |
| Size Range | NPS 1/2″ to 16″; OD 6.35–406.4 mm |
| Wall / Schedule | SCH 5S, 10S, 40S, 40, 80S, 80, 120, 160, XXS |
| Condition / Manufacturing | Annealed (soft) or Stress-Relieved; Cold-drawn |
| Fittings Specifications | |
| Parameter | Details |
| Fittings Standards | Buttweld Fittings: ASTM B366 / ASME SB366 |
| Dimensions | ASME B16.9, B16.28, MSS SP-43 |
| Size | BW Size: NPS 1/2″ to 48″ |
Chemical Composition of Monel 400 Pipes & Fittings
As per ASTM B165, the chemical composition of Monel 400 pipes and fittings and its key alloying elements are provided in the table below:
| Material / Element | Nickel + Cobalt | Copper (Cu) | Iron (Fe) | Manganese (Mn) | Carbon (C) | Silicon (Si) | Sulfur (S) |
|---|---|---|---|---|---|---|---|
| Min (%) | 63.0 | 28.0 | – | – | – | – | – |
| Max (%) | – | 34.0 | 2.5 | 2.0 | 0.3 | 0.5 | 0.024 |
Nickel (63% min) and copper (28–34%) form a single-phase FCC solid-solution binary alloy. Full mutual solubility means no secondary phase precipitation and no sensitisation. Copper provides signature HF acid and deaerated reducing acid resistance. Low iron (≤2.5%) keeps the alloy in the Ni-Cu binary system. The Curie temperature falls between 21–49°C (70–120°F), so some heats may be slightly magnetic at room temperature depending on composition.
Mechanical Properties of Monel 400 Pipes & Fittings
As per ASTM B165, the mechanical properties of Monel 400 pipes and fittings in the annealed and stress-relieved conditions are covered in the table below:
| Condition | Tensile (MPa) | Yield 0.2% (MPa) | Elong. (%) | Hardness |
|---|---|---|---|---|
| Annealed | 480 | 195 | 35 | 75 HRB max |
| Stress-Relieved | 480 | 170 | 35 | 85–100 HRB |
Monel 400 has no ductile-to-brittle transition even at liquid hydrogen temperature (–253°C / –423°F), making it ideal for cryogenic piping. Charpy V-notch impact at –196°C exceeds 196 J for a hot-rolled plate. Cold working raises tensile strength but reduces ductility; the alloy cannot be precipitation hardened.
Monel 400 Equivalent Grades
Monel 400 standard equivalent designation is UNS N04400, and its Werkstoff Nr. is 2.4360. Some other equivalent designations are mentioned in the table below:
| Property | UNS | Werkstoff | JIS | DIN |
|---|---|---|---|---|
| Designation | N04400 | 2.4360 (2.4361) | NW4400 | 17751 |
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Types of Monel 400 Pipes & Fittings
At Nicorex Alloys, we stock the following types of Monel 400 pipes and fittings:
Monel 400 Seamless Pipe
Monel 400 Welded Pipe
Monel 400 Heat-Exchanger Tube
Monel 400 ERW / EFW Pipe
Monel 400 Elbow (45° / 90° / 180°)
Monel 400 Tee (Equal / Reducing)
Monel 400 Reducer (Concentric / Eccentric)
Monel 400 Cap & Stub End
Industries Using Monel 400 Pipes & Fittings
Monel 400 pipes and fittings are specified for 7 applications where marine environments, HF acid, and reducing media demand the Ni-Cu binary alloy’s corrosion protection:
- Marine & Naval: Seawater piping, pump and propeller shafts, submarine components, ballast system piping, and marine fixtures.
- Oil Refining / HF Alkylation: The primary alloy for HF alkylation unit piping in petroleum refineries. Reactor piping, settler piping, acid transfer lines, and regeneration system piping handling anhydrous and aqueous HF.
- Chemical Processing: Piping for deaerated sulfuric and hydrochloric acid under reducing conditions. Caustic evaporator piping for NaOH and KOH. Chemical process equipment handling alkalis at elevated concentrations.
- Desalination: Evaporator and condenser tubes in MSF and MED desalination plants. Freshwater tank piping.
- Power Generation: Boiler feedwater heater tubing, deaerating heater piping, condenser tubes, and steam-line bellows.
- Oil & Gas / Petrochemical: Crude petroleum stills and process vessels. Gasoline and fuel tank piping. Piping in hydrocarbon environments where reducing conditions prevail.
- Fluorochemical Manufacturing: Piping for fluorine and fluoride compound production. The alloy's HF resistance extends to fluorine-bearing environments. Used in fluorochemical manufacturing plants.
How to Order Monel 400 Pipes & Fittings from Nicorex Alloys
To place an order for Monel 400 pipes and fittings, provide the following details:
- Product Form — Seamless Pipe / Fittings (Elbow, Tee, Reducer, End Cap)
- Size — OD x WT or NPS x Schedule
- End Type — PE / BE / BW
- Material Grade — Monel 400 / UNS N04400 / W.Nr. 2.4360
- Quantity — Pieces or total weight in kg / MT
- Standard — ASTM B165 (pipe) / ASTM B366 (fittings), ASME B16.9
- Additional Requirements — NACE, PMI, annealed condition, IGC, heat / lot traceability
- Documentation — MTC 3.1/3.2, PMI Report, Chemical Composition Report, TPI Certificate
- Packaging — VCI wrap, ISPM 15 compliant export crating
- Delivery — Domestic / International (specify destination)
For HF acid service, stress relief at 540–650°C (1000–1200°F) / 1 hr + slow cool is STRONGLY recommended to prevent SCC. Specify this requirement when ordering.
Frequently Asked Questions
What ASTM Standard Covers Monel 400 Pipe?
ASTM B165 / ASME SB165 covers cold-worked seamless pipe and tube. Welded pipe: B725. Condenser tube: B163. Fittings: B366 (buttweld).
What is the Price of Monel 400 Fitting in India?
The price of Monel 400 fittings depends on size, schedule, condition, seamless vs welded, quantity, and nickel/copper market rates. Contact Nicorex Alloys for current pricing.
Is Monel 400 Pipe Resistant to Hydrofluoric Acid?
Yes. Monel 400 exhibits excellent resistance to hydrofluoric acid in both aerated and deaerated conditions. This is why it is the standard for HF alkylation units in refineries and fluorochemical plants.
What Welding Filler Metal is Used for Monel 400 Pipe?
ERNiCu-7 (FM 60) for GTAW. ENiCu-7 (Electrode 190) for SMAW. For dissimilar joints or higher corrosion resistance, Inconel FM 625 (ERNiCrMo-3) is an option.
What is the Maximum Temperature for Monel 400 Fittings?
The maximum temperature for Monel 400 fittings is up to 540°C (1000°F) in oxidising atmospheres. Higher in reducing environments. Also excels at cryogenic temperatures with no ductile-to-brittle transition down to –253°C (–423°F).
Is Monel 400 Pipe NACE Compliant?
Yes. Listed in NACE MR-01-75 / ISO 15156 for sour gas (H₂S) service. Stress relief is recommended for NACE applications.