Monel 400 Seamless Pipe designated as UNS N04400 and EN 2.4360. It has high corrosion resistance, stable mechanical properties and wide adaptability to harsh environments. As a solid solution alloy, it is processed by cold drawing, hot extrusion and other seamless technologies, with higher pressure-bearing capacity and structural integrity than welded pipes, suitable for critical industrial applications.
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Monel 400 Pipe Material Standards
Primary standards: ASTM B165/ASME SB165 (nickel-copper alloy seamless pipes and tubes), ASTM B163 (seamless nickel alloy condenser and heat exchanger tubes). Supplementary standards include DIN 17752, AMS 4574 and GB/T non-ferrous metal material specifications for cross-reference in domestic and foreign projects.
alloy 400 pipe Dimensional Parameters
Outer diameter (OD): 4.0mm - 219.1mm, including NPS 1/8″ - 8″ standard sizes and customized dimensions.
Wall thickness (WT): 0.5mm - 20mm, compatible with SCH 5, SCH 10, SCH 40, SCH 80 and other schedule grades.
Length: 6000mm - 12000mm, supporting fixed length, random length and custom cutting services.
End treatment: beveled end, plain end, with plastic protectors for anti-corrosion during transportation.
ni 400 pipe Chemical Composition (wt%)
Nickel (Ni): 63.0% - 70.0%, Copper (Cu): remainder, Iron (Fe): ≤2.5%, Manganese (Mn): ≤2.0%, Carbon (C): ≤0.3%, Silicon (Si): ≤0.5%, Sulfur (S): ≤0.024%. The balanced nickel-copper ratio ensures excellent corrosion resistance and mechanical stability.
uns n04400 pipe Mechanical Properties
Annealed state (OD ≤127mm): Tensile strength 480MPa, yield strength (0.2% offset) 195MPa, elongation 35%.
Annealed state (OD >127mm): Tensile strength 480MPa, yield strength 170MPa, elongation 35%.
Stress-relieved state (all sizes): Tensile strength 585MPa, yield strength 380MPa, elongation 15%.
Additional properties: Hardness 85HRB, elastic modulus 150GPa, shear modulus 62GPa, density 8.83g/cm³, melting point 1300-1350°C.
alloy n04400 pipe Corrosion Resistance
Pipe Seamless Monel-400 exhibits excellent resistance to seawater, brine, acids and alkalis. Monel 400 Seamless Pipe is resistant to pitting, crevice corrosion and chloride-induced stress corrosion cracking, performing stably in fast-flowing seawater and chemical media. It is suitable for reducing environments such as hydrofluoric acid and sulfuric acid, but has limited adaptability to oxidizing media like nitric acid.
monel n04400 tubing Processing Performance
Monel 400 Seamless Pipe can be processed by conventional mechanical methods, with good weldability. Ni-Cu series welding materials (e.g., ERNiCu-7) are recommended for welding, and post-weld heat treatment is advised to restore plasticity and toughness. It is non-magnetic in the annealed state and maintains structural stability under sub-zero to high-temperature conditions (up to 1000°C).
astm monel 400 pipe Typical Applications
Marine engineering: Seawater pipelines, marine platform equipment, pump shafts, seawater valves and offshore oilfield facilities.
Chemical processing: Corrosive medium conveying pipelines, heat exchangers, reaction vessels and acid-base treatment equipment.
Oil & gas industry: Downhole tubing, instrumentation lines and refining equipment for corrosive oil and gas.
Other fields: Nuclear industry fuel conveying pipelines, aerospace engine components and heat exchanger tubes in high-temperature environments.
monel 400 tubing Quality Inspection and Packaging
alloy 400 seamless pipe Inspection Items
Each batch of pipes undergoes strict quality testing, including chemical composition analysis, tensile test, flattening test, hydrostatic test, non-destructive testing (NDT), intergranular corrosion test and metallographic examination. Inspection certificates such as EN 10204 Type 3.1 (mill test certificate) and Type 3.2 (third-party inspection) are provided.
monel 400 seamless pipe Packaging Standards
Small-diameter pipes are bundled and covered with seaworthy moisture-proof bags. large-diameter pipes are individually packaged with plastic end caps. Custom packaging solutions are available to meet international shipping requirements and prevent damage during transportation.
