Multimet N155,Multimet Forgings,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 Forgings / UNS R30155 **Iron-Nickel-Chromium-Cobalt Superalloy Forgings** --- ### 1. Product Overview **Multimet N155 Forgings** (UNS R30155) are manufactured through controlled thermomechanical processes that optimize the microstructure and mechanical properties of this iron-nickel-chromium-cobalt superalloy. The forging process enhances grain structure, eliminates porosity, and improves directional strength, resulting in components with superior performance characteristics including excellent high-temperature strength up to **980°C (1800°F)**, outstanding oxidation resistance, and good fabricability. --- ### 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 - **Reduction of Area**: 45% 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. Forging Process & Capabilities **Forging Methods:** - **Open-Die Forgings**: For large, simple shapes - **Closed-Die Forgings**: For complex geometries - **Ring Rolling**: For circular components - **Press Forgings**: For high-volume production **Size Range:** - **Weight**: 1 kg to 5000 kg - **Maximum Dimensions**: 3000 mm length - **Ring Sizes**: 300 mm to 3500 mm OD **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 --- ### 6. Applications **Aerospace & Defense:** - Gas turbine disks and shafts - Combustion chamber components - Afterburner parts - Missile body sections **Power Generation:** - Gas turbine wheels - Turbine blades and vanes - Steam turbine components - Nuclear reactor internals **Industrial Equipment:** - High-temperature valves - Pump shafts and impellers - Heat treatment fixtures - Chemical processing equipment **Oil & Gas Industry:** - Downhole tool components - Wellhead equipment - Valve bodies and parts - Subsea system components --- ### 7. International Standards | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | R30155 | Material designation | | **AMS** | 5768 | Bar and Forgings | | **ASTM** | B572 | Rod and Bar | | **ASME** | SB-572 | Pressure Component Applications | --- ### 8. Quality Assurance **Testing & Inspection:** - **Ultrasonic Testing**: per ASTM A388 - **Liquid Penetrant Inspection**: per ASTM E165 - **Radiographic Examination**: per ASTM E94 - **Macro-Etch Testing**: for grain flow verification - **Mechanical Testing**: per applicable specifications **Certification:** - Mill Test Certificate EN 10204 3.1/3.2 - Chemical and Mechanical Property Reports - Heat Treatment Documentation - Non-Destructive Testing Reports --- ### 9. Design Advantages - **Superior grain structure** and directional properties - **Enhanced fatigue resistance** - **Improved stress rupture strength** - **Better impact toughness** - **Reduced material anisotropy** - **Elimination of casting defects** - **Optimized mechanical properties** --- ### 10. Machining & Fabrication **Machining Guidelines:** - **Tool Material**: Carbide recommended - **Cutting Speeds**: 15–25 m/min for roughing - **Feed Rates**: 0.15–0.30 mm/rev - **Coolant**: Heavy-duty soluble oil required - **Chipbreaker Inserts**: Recommended **Post-Forging Processing:** - **Solution Annealing** after rough machining - **Stress Relief** after heavy machining - **Final Machining** to required dimensions - **Surface Treatment** as specified **Welding Characteristics:** - **Excellent Weldability**: GTAW, GMAW processes - **Filler Metal**: AWS A5.14 ERNiCrCoMo-1 - **Preheat**: 200–300°C (400–600°F) recommended - **Post-Weld Heat Treatment**: Solution anneal recommended --- ### 11. Technical Advantages - **Excellent high-temperature strength** up to 980°C - **Outstanding oxidation resistance** in air and combustion atmospheres - **Good thermal fatigue resistance** - **Enhanced reliability** through forged structure - **Good fabricability and weldability** - **Maintains structural stability** at elevated temperatures - **Proven performance** in demanding applications --- **Note:** Multimet N155 Forgings offer excellent performance for high-temperature applications where oxidation resistance and elevated temperature strength are required. The forging process provides enhanced mechanical properties and reliability compared to cast components. All forgings are supplied with complete traceability and certification. Custom forging designs and heat treatment cycles are available to meet specific application requirements. Consult with our technical team for design optimization and manufacturing recommendations.

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 2296 gallon liquid totes Special package is available on request.