ASME SB165 UNS N04400 Monel 400 Nickel Alloy Pipe 66Ni/34Cu Seamless Pipe
ASME SB165 UNS N04400 / Monel 400 Nickel Alloy Seamless Pipe
ASME SB165 UNS N04400 Nickel Alloy Seamless Pipe Equivalent Grade
| 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 |
ASME SB165 UNS N04400 Nickel Alloy Seamless Pipe 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 % |
ASME SB165 UNS N04400 Nickel Alloy Seamless Pipe Chemical Composition (%)
| Ni | C | Mn | Si | Fe | Cu | S |
| 63.0 min | 0.3 max | 2.0 max | 0.5 max | 2.5 max | 28.0-34.0 | 0.024 max |
Comparison Table: Monel 400 vs. Common Alternatives
| Feature | ASME SB165 | Austenitic Stainless Steel | Carbon Steel |
|---|---|---|---|
| Primary Corrosion Resistance | Excellent in seawater, HF acid, alkalis | Good in oxidizing environments; poor in chlorides | Poor; rusts easily |
| Chloride Stress Corrosion Cracking | Virtually Immune | Highly Susceptible | Not Applicable |
| Strength | High | Moderate | Moderate to High |
| Toughness at Cryogenic Temp | Excellent | Excellent | Poor |
| Cost | High (Premium Material) | Moderate | Low |
| Thermal Conductivity | Good | Poor |
This is the main reason for choosing Monel 400 over stainless steels or carbon steels.
Excellent in Seawater and Marine Environments: It has outstanding resistance to saltwater and seawater-induced corrosion, including pitting and crevice corrosion.
Resistance to Acid and Alkaline Solutions: It performs well in a wide range of conditions, particularly against:
Hydrofluoric Acid: Monel 400 is one of the few metals that can handle hydrofluoric acid, especially in the absence of air.
Sulfuric and Hydrochloric Acids: It offers good resistance, especially under reducing conditions.
Alkalis: It is highly resistant to alkaline solutions, including strong caustic soda (sodium hydroxide).
Neutral Salt Solutions: It resists corrosion from most neutral salts.
Application
Oil & Gas: Downhole instrumentation, wellhead components, production tubing, process piping in sour gas service.
Marine Engineering: Seawater piping systems, pump shafts, valve trim, fasteners, heat exchangers.
Chemical Processing: Process vessels, piping, and pumps handling acids, alkalis, and salts, especially hydrofluoric acid.
Power Generation: Feedwater heaters, condenser tubes in fossil and nuclear power plants.
Desalination Plants: Heat rejection and recovery sections, brine heaters.
Shipbuilding (e.g., propeller shafts, pump shafts, seawater piping)
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