Products Description
Product Specifications
| Standards |
ASTM B165 / ASME SB165 |
| Steel Grades |
Monel 400 / Alloy 400 / UNS N04400 |
| Equivalent Standards | DIN 17740 (NiCu30Fe);BS 3072-3076 (NA13);AFNOR NU30;JIS NW4400;EN 2.4360 / 2.4361 |
| Outer Diameter (OD) | 6.53 mm - 219.1 mm |
| Wall Thickness (WT) | 0.89 mm - 12.7 mm |
| Length | up to 20 m |
| Surface Treatment | Pickled, bright annealed, polished or mechanically finished as required |
| Production Process | Cold-rolled / cold-drawn |
| Condition | Annealed / Solution Annealed + Pickled / Cold Worked |
Monel 400 is a solid-solution-strengthened alloy based on nickel, containing approximately 28%–34% copper, with a nickel content of no less than 63%. In flowing seawater with a velocity exceeding 1 m/s, Monel 400 seamless pipes exhibit resistance to pitting, crevice corrosion, and erosion-corrosion at temperatures up to 50°C; they remain suitable for use in oxygenated seawater at temperatures as high as 80°C.
Monel 400 offers an excellent combination of strength and toughness. At an elevated temperature of 425°C, it maintains a tensile strength of approximately 450 MPa and a yield strength of about 170 MPa, ensuring reliable load-bearing capacity even in the high-temperature sections of marine propulsion systems.
Customized Services
- Custom Sizing: We offer production of non-standard, custom-sized seamless pipes. We can manufacture pipes to your specific drawings, covering an outer diameter (OD) range of 6.53–219.1 mm and a wall thickness range of 0.89–12.7 mm.
- Precision Cutting: We provide precision cutting services with an accuracy of ±1 mm, for lengths up to 20 meters.
- Surface Finish Customization: A variety of surface treatments are available, including bright annealing (BA), pickling and passivation, mechanical polishing, and mirror polishing.
- Bending Services: We offer U-tube bending services.
Chemical Composition
| Element | Ni + Co | Cu | Fe | Mn | C | Si | S |
|---|---|---|---|---|---|---|---|
| Monel 400 | ≥ 63.0 | 28.0–34.0 | ≤ 2.50 | ≤ 2.00 | ≤ 0.30 | ≤ 0.50 | ≤ 0.024 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|
| Monel 400 | 70 ksi / 483 MPa | 28 ksi / 193 MPa | 35% |
Possible Alternative Grades
- Inconel 625 (UNS N06625) exhibits superior stability in environments containing sulfides, acidic media, or seawater at high temperatures and pressures. While its mechanical properties far exceed those of Monel 400, it costs approximately 1.5 to 2 times as much.
- For moving components that require high strength-such as seawater pump shafts or valve stems-Monel K500 is a suitable choice, offering significantly higher strength while maintaining excellent corrosion resistance.
- For general seawater piping systems-where the water is clean and flow velocity is moderate-90/10 copper-nickel alloy is a suitable choice; it is significantly more cost-effective than Monel 400.
application areas
- Marine Seawater Piping Systems: Seawater cooling piping, fire-fighting seawater piping, ballast water system piping, and bilge water system piping.
- Seawater Desalination Units: Brine heater tube bundles, evaporator piping, and brine discharge piping.
- Offshore Engineering Heat Exchangers: Seawater cooler tube bundles, condenser tubes, and lubricating oil coolers.
- Pumps, Valves, and Shafting: Seawater pump casings and shafts, valve stems, and propeller shaft sleeves.
- Power Plants: Feedwater heater tubes, steam generator piping, and seawater piping for flue-gas desulfurization (FGD) systems.
- Offshore Platforms: Seawater injection piping, fire-fighting water systems, and inert gas scrubber piping.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: What is the difference between ASTM B165 and ASTM B163? Which standard should be selected for Monel 400 seamless pipes?
A: ASTM B165 covers general requirements for cold-worked seamless pipes and tubes, offering a broader scope of application; ASTM B163 is specifically intended for seamless pipes used in heat exchangers and condensers, featuring more detailed specifications for dimensional tolerances and inspection requirements.
Q: Can Monel 400 seamless pipe be welded directly to carbon steel or stainless steel?
A: Yes, they can be welded, but the dilution effect must be considered. When welding Monel 400 directly to carbon steel, a satisfactory joint can be achieved by controlling the dilution rate. When welding to stainless steel, it is recommended to use ERNiCr-3 filler metal, or alternatively, to apply a pure nickel buffer layer (weld overlay) on the stainless steel side.
Q: What is the maximum service temperature for Monel 400 pipes?
A: In a seawater environment, the recommended continuous service temperature is no higher than 80°C. In non-corrosive or mildly corrosive media, the material can be used at temperatures up to approximately 480°C. At 425°C, it can still maintain a tensile strength of about 450 MPa.
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