Alloy R41,Rene 41 Bar(Round bar, Flat bar),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 Bar (Round Bar, Flat Bar) (UNS N07041) - Technical Datasheet** #### **1. Overview** Alloy R-41 (René 41) Bar products encompass both round and flat bar forms of this premium precipitation-hardenable nickel-based superalloy. René 41 represents one of the highest strength commercially available superalloys, maintaining exceptional mechanical properties at temperatures up to 980°C (1800°F). The bar forms are specifically engineered for machining into critical components where maximum strength-to-weight ratio and high-temperature performance are essential. #### **2. Chemical Composition** | 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 | | **Electrical Resistivity** | 1.30 μΩ·m | - | #### **4. Mechanical Properties (Aged Condition)** **Room Temperature Properties:** - **Tensile Strength:** 1310-1520 MPa (190-220 ksi) - **Yield Strength (0.2% Offset):** 1030-1240 MPa (150-180 ksi) - **Elongation:** 8-15% - **Reduction of Area:** 10-20% - **Hardness:** 36-42 HRC **Elevated Temperature Properties (870°C/1600°F):** - **Tensile Strength:** 620-690 MPa (90-100 ksi) - **Yield Strength:** 480-550 MPa (70-80 ksi) - **Stress Rupture (100h life):** 170 MPa (25 ksi) #### **5. René 41 Bar Product Forms** **Round Bar:** - **Diameter Range:** 3 mm to 300 mm (0.125" to 12") - **Standard Tolerance:** ±0.1mm to ±0.5mm depending on diameter - **Surface Finish:** Hot finished, turned, or centerless ground - **Straightness:** Standard commercial to premium aircraft quality **Flat Bar:** - **Thickness Range:** 3 mm to 100 mm (0.125" to 4") - **Width Range:** 10 mm to 300 mm (0.375" to 12") - **Edge Conditions:** As-rolled, milled, or precision ground edges - **Squareness:** Controlled per AMS 2249 requirements **Available Conditions:** - **Solution Annealed:** Optimal for machining and forming operations - **Solution Treated & Aged:** Ready for final use condition - **Hot Worked:** As-forged or hot-rolled condition #### **6. Applications** **Aerospace & Defense:** - **Turbine Engine Components:** Disks, shafts, blades, and seals - **Rocket Motor Cases:** Nozzle components and structural supports - **Aircraft Structures:** High-temperature mounting brackets and fittings - **Fastener Stock:** High-strength bolts, studs, and precision pins **Industrial Applications:** - **Gas Turbine Parts:** Rotor components and turbine wheels - **Nuclear Components:** Control rod mechanisms and core supports - **Hot Work Tooling:** Extrusion dies and forming mandrels - **Test Equipment:** High-temperature fixtures and rig components #### **7. Machining & Fabrication** **Machining Guidelines:** - **Annealed Condition:** Recommended for heavy machining operations - **Cutting Tools:** Carbide inserts with positive rake angles - **Cutting Speeds:** 10-20 m/min for roughing, 20-30 m/min for finishing - **Feed Rates:** Moderate to heavy feeds with adequate coolant - **Coolant Requirements:** Heavy-duty soluble oils or synthetic coolants **Forming Operations:** - **Hot Working:** 1050-1200°C (1920-2190°F) - **Cold Working:** Limited to mild forming in annealed condition - **Annealing Temperature:** 1065-1080°C (1950-1975°F) #### **8. Heat Treatment** **Standard Heat Treatment:** 1. **Solution Treatment:** 1065-1080°C (1950-1975°F) for 1-2 hours, rapid cool 2. **Aging Treatment:** 760°C (1400°F) for 16 hours, air cool **Alternative Aging:** - 900°C (1650°F) for 4 hours, then 760°C (1400°F) for 16 hours #### **9. International Standards** **Aerospace Specifications:** - **AMS 5712:** Bars, Forgings, and Rings (Solution Treated and Aged) - **AMS 5713:** Bars and Forgings (Annealed Condition) - **AMS 2249:** Tolerances for Corrosion and Heat Resistant Alloys **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 - **Japan:** JIS NR 401 **Quality Specifications:** - **AMS 2355:** Quality Assurance for Premium Aircraft Alloys - **MIL-STD-2154:** Inspection, Ultrasonic, for Wrought Metals #### **10. Quality Assurance** **Testing & Certification:** - Chemical analysis with full traceability to melt heat - Mechanical testing including tensile and hardness - Macroetch and microcleanliness per AMS 2301/2304 - Ultrasonic testing available for premium quality - Certification to EN 10204 3.1/3.2 standards **Surface Quality:** - Free from seams, laps, and other surface imperfections - Controlled decarburization and surface condition - Suitable for critical aerospace applications --- **Note:** René 41 Bar products offer exceptional strength but require careful handling during fabrication due to sensitivity to strain age cracking. Proper thermal processing and machining techniques are essential to achieve optimal performance. Consultation with materials engineering is recommended for specific application 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 2315 gallon liquid totes Special package is available on request.