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Nickel Alloy 400 | UNS N04400 | 2.4360 | Monel 400
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Nickel Alloy 400 | UNS N04400 | 2.4360 | Monel 400
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy 400, also known as Monel 400, identified as UNS N04400 and Werkstoff 2.4360 (and 2.4361), in plate, sheet, strip, round bar, rod, seamless and welded tubing, pipe, and forging forms . Our Alloy 400 products can be supplied according to ASTM B127 / ASME SB-127 for plate, sheet and strip; ASTM B164 / ASME SB-164 for bar and wire; ASTM B165 / ASME SB-165 for seamless pipe and tube; ASTM B725 / ASME SB-725 for welded pipe; and ASTM B564 / ASME SB-564 for forgings .
Nickel Alloy 400 is a solid-solution nickel-copper alloy that can be hardened only by cold working . The high nickel content (minimum 63%) provides excellent resistance to reducing environments and alkaline solutions, while the copper content (28-34%) extends resistance to non-oxidising acids and seawater . The alloy has been in continuous industrial service since 1905 and remains one of the most consistently specified nickel alloys for marine engineering, chemical processing, and oil and gas applications .
| Item | Supply Information |
|---|---|
| Alloy Grade | Nickel Alloy 400 / Monel 400 |
| UNS Number | N04400 |
| EN / Werkstoff Number | 2.4360 / 2.4361 |
| Plate / Sheet / Strip Standard | ASTM B127 / ASME SB-127, AMS 4544 |
| Bar / Rod / Wire Standard | ASTM B164 / ASME SB-164, AMS 4675, QQ-N-281 |
| Seamless Pipe / Tube Standard | ASTM B165 / ASME SB-165, AMS 4574 |
| Welded Pipe Standard | ASTM B725 / ASME SB-725, ASTM B751 |
| Forgings Standard | ASTM B564 / ASME SB-564 |
| Fittings Standard | ASTM B366 / ASME SB-366 |
| Product Forms | Plate, sheet, strip, round bar, rod, seamless pipe, welded pipe, tubing, forgings, fittings, wire |
| Supply Condition | Annealed or cold-worked |
| Surface | Pickled, peeled, ground, polished or machined |
| Testing | Chemical analysis, tensile, hardness, PMI, and dimensional inspection |
| Inspection Documents | EN 10204 3.1 MTC; third-party inspection optional |
| Processing | Cutting, turning, milling, drilling and machining |
| Property | Typical Reference |
|---|---|
| Density | 8.80 – 8.83 g/cm3 |
| Melting Range | 1,300 – 1,350°C |
| Modulus of Elasticity | 179 – 180 GPa at 20°C |
| Thermal Conductivity | 21.8 W/m-K |
| Electrical Resistivity | 51.1 µΩ·cm |
| Coefficient of Expansion (20-300°C) | ~15.7 µm/m-°C |
| Tensile Strength, Annealed | 480 – 620 MPa (70 – 90 ksi) |
| Yield Strength (0.2%), Annealed | 170 – 345 MPa (25 – 50 ksi) |
| Elongation, Annealed | 35 – 60% |
| Hardness, Annealed | 60 – 80 HRB / 120 – 150 HB |
| Spring Temper, Tensile Strength | Up to 1,240 MPa (180 ksi) |
| Maximum Service Temperature | ~550°C (continuous) |
| Heat Treatment | Solution annealed at 870 – 980°C; not age-hardenable |
| Available Forms | Plate, sheet, strip, round bar, rod, seamless pipe, welded pipe, tubing, forgings, wire |
| Product Standards | ASTM B127, B164, B165, B564, B366, B725; ASME SB-127, SB-164, SB-165, SB-564, SB-366, SB-725; AMS 4544, 4675, 4574 |
Actual properties depend on product form, dimensions, and the specified standard.
Solution Annealed
Alloy 400 is normally supplied in the annealed condition. The standard annealing treatment is performed at approximately 870 – 980°C (1,600 – 1,800°F) followed by rapid cooling . This treatment provides optimal corrosion resistance and ductility for forming and fabrication. Unlike age-hardenable alloys, Alloy 400 does not require precipitation aging treatments—it is a solid-solution alloy that is hardened only through cold working .
Cold Working / Spring Temper
Alloy 400 is not age-hardenable – strength increases only through cold working. Annealed material typically exhibits tensile strength of 70 – 90 ksi (480 – 620 MPa), while spring temper can achieve up to 180 ksi (1,240 MPa) . The alloy remains ductile even at subzero temperatures and can be cold-formed using standard fabrication methods .
Alloy 400 provides excellent resistance to a wide range of corrosive environments, particularly in marine and chemical applications .
Key Corrosion Characteristics:
- Excellent resistance to seawater and brackish water, even under high-velocity conditions – one of the very few alloys to resist erosion-corrosion and cavitation reliably
- Outstanding resistance to hydrofluoric acid (HF) across all concentrations – no standard stainless steel grade matches this performance
- Good resistance to sulfuric acid up to 80% concentration at room temperature; resistant to deaerated hydrochloric acid
- Excellent resistance to alkaline solutions (NaOH, KOH) across most concentrations
- Resistant to chloride ion stress-corrosion cracking
- Good resistance to steam at elevated temperatures – widely specified for steam line components
- Slightly magnetic at room temperature; becomes non-magnetic above approximately 40°C
Selection Considerations:
- Not resistant to oxidising environments – nitric acid, aerated hydrochloric acid, ferric chloride solutions, and other oxidising media will corrode it rapidly
- Aeration of hydrochloric acid significantly increases corrosion rates
- For applications requiring even higher strength, consider Alloy K-500 (precipitation-hardened variant)
- Final selection must consider the specific medium, concentration, temperature, and whether the environment is oxidising or reducing
- Marine Engineering: Propeller shafts, pumps, valves, marine fixtures and fasteners in seawater environments
- Chemical Processing: Heat exchangers, tanks, evaporators, transfer piping, process vessels, pickling bath heating coils
- Oil and Gas: Crude oil distillation towers, offshore equipment, transfer piping from refinery columns, cladding for crude column upper areas
- Hydrocarbon Processing: Equipment for chlorinated plastics, perchlorethylene, monoethanolamine (MEA) reboiling tubes
- Power Generation: Feed water and steam generator tubing, boiler feedwater heaters
- Salt Production: Equipment for salt and brine handling
Available quality-control services include:
- Heat-number traceability
- Chemical composition verification
- Tensile, yield and elongation testing
- Hardness inspection
- Dimensional and surface inspection
- Positive Material Identification (PMI)
- Ultrasonic testing
- Dye penetrant inspection
- Heat-treatment records
- EN 10204 3.1 material certificate
For an accurate quotation, please provide:
Alloy Grade · Standard · Product Form · Dimensions · Quantity · Heat Treatment · Inspection Requirement · Application · Working Temperature · Destination Port
For corrosive environments, also provide:
Chemical Medium · Concentration · Temperature · Oxidizing or Reducing Conditions
- Request Nickel Alloy 400 Quote
- Upload Drawing or MTO
- Check Available Stock
- Ask for Alloy Selection Support
Nickel Alloy 400 (UNS N04400), also known as Monel 400, is a nickel-copper alloy offering excellent resistance to seawater, hydrofluoric acid, sulfuric acid, and alkaline solutions, with high strength and toughness over a wide temperature range .
The UNS designation is N04400; the European Werkstoff numbers are 2.4360 and 2.4361 .
ASTM B127 / ASME SB-127 applies to plate, sheet and strip; ASTM B164 / ASME SB-164 applies to bar, rod and wire .
ASTM B165 / ASME SB-165 applies to seamless pipe and tube; ASTM B725 / ASME SB-725 applies to welded pipe .
No. Alloy 400 is a solid-solution alloy that is hardened only through cold working. It is not age-hardenable .
It resists seawater (even under high-velocity conditions), hydrofluoric acid, sulfuric acid, hydrochloric acid (deaerated), alkaline solutions, steam, and chloride stress-corrosion cracking .
Alloy 400 is not resistant to oxidising environments – nitric acid, aerated hydrochloric acid, ferric chloride solutions, and similar oxidising media will corrode it rapidly .
Alloy 400 is slightly magnetic at room temperature but becomes non-magnetic above approximately 40°C .
Yes. Alloy 400 has good weldability. Recommended filler materials include ERNiCu-7 (MIG/TIG) and ENiCu-7 (electrode) .
Please provide the standard, product form, dimensions, quantity, heat-treatment condition, inspection requirements, application, working temperature and destination port. For corrosive environments, also specify the chemical medium and whether the environment is oxidising or reducing .
