Multimet N155,Multimet Tube,UNS R30155,E FORU

British Specs:，American Specs: AMS 5532 Sheet, Plate and Strip AMS 5769 Bars, Rings and Forgings AMS 5794 Welding Wire AMS 5795 Coated Electrodes，German Specs:

### Technical Data Sheet: Multimet N155 / Multimet Tube / UNS R30155 **Iron-Nickel-Chromium-Cobalt Superalloy Tubular Products** --- ### 1. Product Overview **Multimet N155 Tube** (UNS R30155) represents the tubular form of this iron-nickel-chromium-cobalt superalloy, designed for high-temperature applications requiring excellent strength and oxidation resistance up to **980°C (1800°F)**. These tubes maintain outstanding mechanical properties and are suitable for critical heat transfer, instrumentation, and structural applications in extreme environments. --- ### 2. Chemical Composition (Weight %) | Element | Content (%) | Key Characteristics | |---------|-------------|---------------------| | **Iron (Fe)** | Balance | Matrix element | | **Chromium (Cr)** | 20.0–22.0 | Oxidation and corrosion resistance | | **Nickel (Ni)** | 19.0–21.0 | Austenitic structure stability | | **Cobalt (Co)** | 18.0–20.0 | Solid solution strengthening | | **Tungsten (W)** | 2.0–3.0 | Solid solution strengthening | | **Molybdenum (Mo)** | 2.0–3.0 | Solid solution strengthening | | **Niobium (Nb)** | 0.75–1.25 | Carbide formation and strengthening | | **Carbon (C)** | 0.05–0.10 | Carbide strengthening | | **Nitrogen (N)** | 0.10–0.20 | Solid solution strengthening | | **Manganese (Mn)** | 1.0–2.0 | Hot workability | | **Silicon (Si)** | ≤ 0.75 | Residual element | --- ### 3. Physical Properties | Property | Value | |----------|-------| | **Density** | 8.23 g/cm³ (0.297 lb/in³) | | **Melting Range** | 1370–1425°C (2500–2600°F) | | **Thermal Conductivity** | 14.2 W/m·K at 100°C | | **Mean CTE (20-100°C)** | 14.5 µm/m·°C | | **Electrical Resistivity** | 1.05 µΩ·m at 25°C | | **Magnetic Permeability** | Essentially non-magnetic | --- ### 4. Mechanical Properties **Room Temperature Properties (Solution Annealed):** - **Tensile Strength**: 790 MPa min (115 ksi min) - **Yield Strength (0.2% Offset)**: 415 MPa min (60 ksi min) - **Elongation**: 35% min - **Hardness**: 95 HRB max **Elevated Temperature Performance:** - **Stress Rupture Strength**: 100 MPa at 815°C for 100 hours - **Creep Strength**: Excellent up to 980°C - **Oxidation Resistance**: Excellent up to 980°C --- ### 5. Product Specifications **Tube Size Range:** - **Outside Diameter**: 3 mm to 100 mm (0.125" to 4") - **Wall Thickness**: 0.5 mm to 10 mm (0.020" to 0.375") - **Length**: Standard 3-7 meters, custom lengths available **Manufacturing Processes:** - **Seamless Tube**: ASTM B622 for high-pressure applications - **Welded Tube**: ASTM B626 for general service - **Surface Finish**: Pickled, bright annealed, or polished **Tolerance Standards:** - **OD Tolerance**: ±0.1 mm for precision tubes - **Wall Tolerance**: ±10% standard, ±5% special - **Straightness**: 1.5 mm/m maximum --- ### 6. Applications **Heat Exchanger Applications:** - High-temperature heat exchanger tubes - Waste heat recovery systems - Process heater tubes - Nuclear steam generator tubes **Aerospace & Defense:** - Jet engine bleed air systems - Hydraulic line conduits - Fuel system components - Environmental control systems **Industrial Processing:** - Thermocouple protection sleeves - Radiation pyrometer tubes - Furnace radiant tubes - Chemical process tubing **Power Generation:** - Superheater and reheater tubes - Boiler tubes for advanced cycles - Gas turbine transition pieces - Heat recovery system components --- ### 7. International Standards | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | R30155 | Material designation | | **ASTM** | B622 | Seamless Pipe and Tube | | **ASTM** | B626 | Welded Tube | | **ASME** | SB-622 | Boiler and Pressure Vessel Code | | **AMS** | 5768 | Bar and forgings (base material) | --- ### 8. Fabrication & Installation **Tube Bending & Forming:** - **Minimum Bend Radius**: 2 × OD for thin walls - **Bending Temperature**: Cold bending preferred, hot bending at 1150°C - **Springback Allowance**: 10–15% typical - **Bending Methods**: Mandrel bending for tight radii **Joining Methods:** - **Welding**: GTAW with matching filler metal - **Tube Fittings**: Swage-type, compression, or brazed fittings - **Expansion Joints**: Suitable for tube-to-tubesheet joining **Heat Treatment:** - **Solution Treatment**: 1175–1205°C (2150–2200°F) - **Aging Treatment**: 730–760°C (1350–1400°F) for 16 hours - **Cooling**: Water quench after solution treatment --- ### 9. Quality Assurance **Standard Testing:** - Hydrostatic or pneumatic testing - Eddy current examination per ASTM E309 - Ultrasonic testing for wall thickness verification - Dimensional inspection per ASTM A450 **Special Testing Available:** - Flare testing for ductility verification - Flattening testing for weld quality - Grain size evaluation per ASTM E112 - High-temperature performance testing --- ### 10. Technical Advantages - **Excellent high-temperature strength** up to 980°C - **Outstanding oxidation resistance** in cyclic conditions - **Good thermal fatigue resistance** - **Excellent structural stability** under thermal stress - **Good fabricability and weldability** - **Long service life** in aggressive environments --- ### 11. Corrosion Resistance Properties - **Oxidation Resistance**: Excellent to 980°C - **Carburization Resistance**: Good - **Sulfidation Resistance**: Moderate to 815°C - **Thermal Fatigue Resistance**: Excellent --- **Note:** Multimet N155 Tube products offer excellent performance for high-temperature applications where oxidation resistance and elevated temperature strength are required. The combination of high strength, excellent environmental resistance, and good fabricability makes these tubes suitable for the most demanding applications in aerospace, power generation, and industrial processing. Consult with our technical team for specific application recommendations and engineering support.

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 2291 gallon liquid totes Special package is available on request.