Alloy 400，Monel 400 Tube，UNS N04400，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA11，American Specs:AMS 4574 Tube AMS 4575 (Tube *) AMS 4675 Bar and Forgings AMS 4730 Wire AMS 4731 Wire and Ribbon AMS 4544 Sheet, Strip and Plate QQ-N-281 ASTM B164，German Specs:

### **Alloy 400 / Monel 400 Tube (UNS N04400) - Product Introduction** **Overview** **Alloy 400** (commercially known as **Monel 400**) is a nickel-copper alloy that offers excellent corrosion resistance and high strength across a wide temperature range. **Monel 400 Tube** is specifically engineered for applications requiring reliable performance in corrosive environments, particularly in heat exchange, instrumentation, and process systems. The material maintains its mechanical properties from cryogenic temperatures up to approximately 540°C (1000°F), making it suitable for various demanding industrial applications. UNS **N04400** is the standardized designation for this alloy composition. Monel 400 tubes are particularly valued for their resistance to seawater, acids, and alkaline solutions, providing superior performance where other materials would typically fail. --- ### **Chemical Composition** The chemical composition is precisely controlled to ensure optimal performance in corrosive environments. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 63.0 (Minimum) | | **Copper (Cu)** | 28.0 - 34.0 | | **Iron (Fe)** | 2.5 (Maximum) | | **Manganese (Mn)** | 2.0 (Maximum) | | **Carbon (C)** | 0.3 (Maximum) | | **Silicon (Si)** | 0.5 (Maximum) | | **Sulfur (S)** | 0.024 (Maximum) | **Note:** The balanced nickel-copper composition provides exceptional resistance to both reducing and oxidizing environments, while the controlled iron content enhances resistance to chloride-induced stress corrosion cracking. --- ### **Physical Properties** Monel 400 tube exhibits consistent physical properties suitable for heat transfer and pressure applications. | Property | Value | | :--- | :--- | | **Density** | 8.80 g/cm³ (0.318 lb/in³) | | **Melting Point** | 1350 °C (2460 °F) | | **Electrical Resistivity** | 51 μΩ·cm at 20°C | | **Thermal Conductivity** | 22 W/m·K at 20°C | | **Thermal Expansion Coefficient** | 13.9 μm/m·°C (20-100°C) | | **Magnetic Permeability** | Essentially non-magnetic | --- ### **Mechanical Properties** Typical mechanical properties for Monel 400 tube in annealed condition: | Property | Value | | :--- | :--- | | **Tensile Strength** | 550 - 690 MPa (80 - 100 ksi) | | **Yield Strength (0.2% Offset)** | 240 - 380 MPa (35 - 55 ksi) | | **Elongation** | 35 - 45% | --- ### **International Standards** Monel 400 tube complies with major international standards: | Standard Organization | Standard Number | Specification | | :--- | :--- | :--- | | **ASTM** | ASTM B165 | Seamless Condenser and Heat Exchanger Tubes | | **ASTM** | ASTM B725/B725M | Welded Tubes | | **ASME** | SB-165 | Boiler and Pressure Vessel Code | | **ASME** | SB-725 | Welded Tubes for General Service | | **DIN** | 2.4360 | NiCu30Fe | | **EN** | EN 2.4360 | Nickel-Copper Alloy Tubes | --- ### **Product Applications** **Heat Exchangers and Condensers:** - Seawater-cooled heat exchangers - Power plant condensers - Chemical processing heat exchangers - Refinery heat transfer equipment **Marine and Offshore:** - Shipboard heat exchangers - Ballast system tubing - Hydraulic lines - Instrumentation tubing **Chemical Processing:** - Process tubing in acid services - Hydrofluoric acid alkylation units - Sulfuric acid concentration systems - Chemical reactor tubing **Oil and Gas:** - Feedwater heater tubes - Well monitoring instrumentation tubes - Gas processing equipment - Brine handling systems **Other Applications:** - Desalination plant tubing - Pharmaceutical processing equipment - Power generation systems - Nuclear service components --- ### **Key Advantages** - **Superior Corrosion Resistance:** Excellent performance in seawater, acids, and alkaline solutions - **Excellent Heat Transfer Properties:** Optimal thermal conductivity for heat exchanger applications - **High Mechanical Strength:** Maintains integrity under pressure and temperature variations - **Good Fabricability:** Can be welded, bent, and expanded using standard techniques - **Non-Magnetic Properties:** Essential for sensitive instrumentation and electronic applications - **Proven Reliability:** Long service life in critical applications Monel 400 Tube (UNS N04400) represents an optimal solution for heat transfer, instrumentation, and process applications where corrosion resistance, reliability, and long-term performance are critical requirements.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1667 gallon liquid totes Special package is available on request.