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| Brand Name: | YUHONG |
| Model Number: | ASME SB163 Monel 400 Nickel Alloy U Bend Tube |
| MOQ: | 1000kgs |
| Payment Terms: | L/C,T/T |
ASME SB163 UNS N04400 / Monel 400 Nickel Alloy Seamless U Bend Heat Exchanger Tube
The U-bend eliminates the need for a return header or flange connection on one end of the tube bundle, creating a compact, two-pass design within a heat exchanger. This reduces potential leak points and cost. ASME SB163 MONEL 400 U-Bend Tubes are a premium, high-performance solution for the critical heat transfer sections of equipment operating in demanding corrosive environments, particularly where seawater, hydrofluoric acid, or reducing chemical media are present.
Advantages of Using MONEL 400 U-Bend Tubes
Corrosion Resistance: Long service life in corrosive cooling media, reducing downtime and replacement costs.
Fouling Resistance: Smoother surface and biostatic properties reduce marine fouling.
Mechanical Integrity: Good strength and ductility withstand operational stresses and vibration.
Design Simplicity: The integral U-bend provides a leak-proof return path.
Chemical Composition of ASME SB163 UNS N04400/Monel 400 Nickel Alloy U Bend Heat Exchanger Tube %
| Grade | C | Mn | Si | S | Cu | Fe | Ni |
| Monel 400 | 0.30 max | 2.00 max | 0.50 max | 0.24max | 28.0-34.0 | 2.50 max | 63.00 min |
Mechanical properties of ASME SB163 UNS N04400/Monel 400 Nickel Alloy U Bend Heat Exchanger Tube
| 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 % |
Physical Properties of ASME SB163 UNS N04400/Monel 400 Nickel Alloy U Bend Heat Exchanger Tube
|
Properties |
Metric |
Imperial |
|---|---|---|
| Density | 8.8 gm/cm3 | 0.318 lb/in3 |
Manufacturing Process:
Tube Production: Seamless tubes are produced as per SB163 (typically via extrusion or pierce and draw methods).
Annealing: Tubes are annealed to achieve the specified soft, ductile temper required for bending.
Bending: Tubes are precisely bent (cold-formed) around a die to form the "U." The most critical parameter is the U-Bend Radius (measured from the centerline), often specified as a minimum radius (e.g., 1.5 x Tube Outer Diameter).
Critical U-Bend Parameters:
Leg Length (Straight Side Length): Distance from the tangent line of the bend to the end of the tube.
Center-to-Center Distance: Distance between the centers of the two legs.
Bend Radius: The radius of the bend itself.
Tube-to-Tube Clearance: In the bundle, this dictates how tightly the U-bends can be packed.
Wall Thinning: During bending, the outer wall of the bend thins. SB163/industry standards allow for controlled thinning (typically up to 17-20% for a given radius).
Ovality: The degree to which the tube cross-section deviates from a perfect circle at the bend.
Application
Shell and Tube Heat Exchangers & Condensers: Especially in the critical U-bend section of U-tube bundle designs.
Industries:
Marine & Offshore: Seawater coolers, condensers, oil coolers.
Chemical & Petrochemical Processing: For handling chlorinated solvents, crude oil distillation, alkylation units.
Power Generation: Feedwater heaters, condenser tubes where brackish or polluted cooling water is used.
HF Alkylation Units: A flagship application due to MONEL 400's exceptional resistance to Hydrofluoric Acid.
PT detects surface-breaking defects in non-porous materials. A liquid penetrant is drawn into flaws by capillary action, then drawn out by a developer to form visible indications.
Why PT for U-bends?
ending induces stress and may reveal material imperfections or cause cracking. PT is ideal for complex curved surfaces where other NDT methods have limitations.
