Monel 400 Heat Exchanger Tube ASME SB163 UNS N04400 Nickel Alloy Seamless U Bend Tube
Monel 400 Heat Exchanger Tube ASME SB163 UNS N04400 Nickel Alloy Seamless U Bend Tube
ASME SB163 UNS N04400 Seamless U Bend Tube, also known as”Monel 400 seamless U bend heat exchanger tube”, is cold-formed U-shaped seamless nickel-copper alloy tube manufactured in accordance with ASME SB163 (equivalent to ASTM B163) standard. This specification governs seamless nickel alloy tubes for condensers, heat exchangers and other heat-transfer equipment. UNS N04400 (Monel 400) is a solid-solution nickel alloy with high nickel content. Straight seamless base tubes are produced by hot extrusion and cold drawing, then cold bent into U-shape for heat exchanger bundle assembly. Post-bending-stress-relief or full annealing is normally performed to eliminate residual bending stress and restore corrosion resistance and ductility. The U-bend configuration removes the requirement for expansion joints, absorbs thermal expansion‑contraction inside shell and tube heat exchangers, and is widely used under corrosive process conditions.
Different Surface Finishes:
Pickled And Annealed
Bright Annealed
Mechanically Polished
Chemical Composition:
| Element | Min | Max |
| Nickel (Ni) | 63.0 | — |
| Copper (Cu) | 28.0 | 34.0 |
| Iron (Fe) | — | 2.50 |
| Manganese (Mn) | — | 2.00 |
| Carbon (C) | — | 0.30 |
| Silicon (Si) | — | 0.50 |
| Sulfur (S) | — | 0.024 |
Main Features:
Excellent Corrosion Resistance
Good Erosion-Corrosion Resistance
Good Ductility & Formability
U-bend Structural Advantage
Homogeneous Single-phase Alloy Microstructure
High Thermal Conductivity
Resistance to Pitting and Crevice Corrosion
Ease of Fabrication
Different Applications:
Power Generation industry
Marine & Offshore Engineering
Desalination Plants
Chemical Processing Industry
Petrochemical Industry
Oil & Gas Industry
Aerospace Industry
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.