Alloy R41,Rene 41 ,UNS N07041,E FORU

British Specs:，American Specs: AMS 5545 Sheet, Strip and Plate AMS 5712 Bars and Forgings AMS 5713 Bars and Forgings AMS 5800 Welding Wire，German Specs:

### **Alloy R-41 / René 41 (UNS N07041) - Technical Datasheet** #### **1. Overview** Alloy R-41 (commercially known as René 41) is a high-strength, precipitation-hardenable nickel-based superalloy designed for exceptional performance at temperatures up to 980°C (1800°F). Originally developed by General Electric, this alloy offers an outstanding combination of high-temperature strength, oxidation resistance, and creep rupture properties, making it suitable for the most demanding aerospace and gas turbine applications. #### **2. Chemical Composition** The alloy's exceptional properties are achieved through a balanced composition of solid solution strengtheners and gamma prime [γ'] formers: | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 18.00 - 20.00 | | **Cobalt (Co)** | 10.00 - 12.00 | | **Molybdenum (Mo)** | 9.00 - 10.50 | | **Aluminum (Al)** | 1.40 - 1.80 | | **Titanium (Ti)** | 3.00 - 3.50 | | **Iron (Fe)** | ≤ 2.00 | | **Carbon (C)** | 0.06 - 0.12 | | **Boron (B)** | 0.003 - 0.010 | | **Silicon (Si)** | ≤ 0.50 | | **Manganese (Mn)** | ≤ 0.50 | | **Copper (Cu)** | ≤ 0.50 | | **Sulfur (S)** | ≤ 0.015 | #### **3. Physical Properties** | Property | Metric Value | Imperial Value | | :--- | :--- | :--- | | **Density** | 8.27 g/cm³ | 0.299 lb/in³ | | **Melting Range** | 1316-1371 °C | 2400-2500 °F | | **Thermal Expansion (20-100°C)** | 12.6 μm/m·°C | 7.0 μin/in·°F | | **Thermal Conductivity** | 12.5 W/m·K | 86.6 BTU·in/hr·ft²·°F | | **Specific Heat Capacity** | 440 J/kg·K | 0.105 BTU/lb·°F | | **Modulus of Elasticity** | 221 GPa | 32 × 10⁶ psi | #### **4. Mechanical Properties** **Room Temperature (Aged Condition):** - **Tensile Strength:** 1310-1520 MPa (190-220 ksi) - **Yield Strength (0.2%):** 1030-1240 MPa (150-180 ksi) - **Elongation:** 8-15% - **Reduction of Area:** 10-20% - **Hardness:** 36-42 HRC **Elevated Temperature (870°C/1600°F):** - **Tensile Strength:** 620-690 MPa (90-100 ksi) - **Yield Strength:** 480-550 MPa (70-80 ksi) - **Creep Rupture Strength (870°C/100h):** 170 MPa (25 ksi) #### **5. Key Characteristics** **Major Advantages:** - Exceptional high-temperature strength up to 980°C (1800°F) - Excellent oxidation and corrosion resistance - Outstanding creep rupture properties - Good structural stability at elevated temperatures - Maintains strength after prolonged exposure to high temperatures **Processing Considerations:** - Requires careful control of heat treatment parameters - Sensitive to strain age cracking during welding - Post-weld heat treatment is generally required - Best welded in solution annealed condition #### **6. Applications** **Aerospace & Jet Engines:** - **Turbine Blades & Vanes:** High-pressure turbine components - **Afterburner Components:** Nozzle seals, flaps, and liners - **Turbocharger Components:** Turbine wheels and shafts - **Rocket Motor Components:** Nozzle skirts and support rings **Industrial Gas Turbines:** - **Turbine Buckets & Blades:** First and second stage rotating components - **Combustion Components:** Liners and transition pieces - **Fasteners:** High-temperature bolts and studs **Specialized Applications:** - **Nuclear Reactor Components:** Fastening systems - **Hot Working Tools:** Dies and fixtures - **Chemical Processing:** High-temperature reactor components #### **7. Heat Treatment** **Standard Heat Treatment:** 1. **Solution Treatment:** 1065-1080°C (1950-1975°F) for 1-2 hours, rapid cool 2. **Aging:** 760°C (1400°F) for 16 hours, air cool **Alternative Aging Treatment:** - 900°C (1650°F) for 4 hours, then 760°C (1400°F) for 16 hours #### **8. International Standards** **Aerospace Specifications:** - **AMS 5545:** Sheet, Strip, and Plate - **AMS 5712:** Bars, Forgings, and Rings - **AMS 5790:** Welding Wire and Rod **ASTM/ASME Standards:** - **ASTM B637/ASME SB637:** Bar, Forgings, and Forging Stock **International Equivalents:** - **Europe:** DIN 2.4972, NiCr19Co17Mo4Ti3Al1.5 - **France:** NC15K19DAT - **United Kingdom:** HR 506 **Welding Specifications:** - **AWS A5.14:** ERNiCrCoMo-1 - **AMS 5790:** Bare Welding Wire #### **9. Fabrication Notes** **Welding:** - Use matching composition filler metal (AMS 5790) - Pre-weld solution treatment recommended - Post-weld heat treatment required to prevent strain age cracking - Low heat input and stringer bead techniques preferred **Machining:** - More difficult to machine than austenitic stainless steels - Requires rigid setups and positive rake angles - Carbide tools recommended for production machining - Adequate cooling and lubrication essential --- **Note:** René 41 is known for its susceptibility to strain age cracking, requiring careful attention to heat treatment and welding procedures. The alloy achieves its maximum properties through precise thermal processing. Consultation with materials engineering is recommended for specific application requirements and fabrication procedures.

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 2313 gallon liquid totes Special package is available on request.