35N Nickel Superalloy,UNS R30035; AMS 5758. ASTM F 562; Cobalt Alloys,E FORU

### **Product Introduction: 35N (UNS R30035) Cobalt-Nickel Superalloy** **35N (UNS R30035)**, often categorized within the family of superalloys, is a cold-worked, non-magnetic, cobalt-nickel-chromium-molybdenum alloy renowned for its unique combination of ultra-high strength, excellent fatigue resistance, and good ductility. Unlike many precipitation-hardened superalloys, 35N achieves its exceptional mechanical properties through a specialized combination of solid-solution strengthening and severe cold working. This alloy is particularly valued for applications requiring high strength-to-weight ratio, resistance to corrosion, and non-magnetic properties. It maintains good mechanical properties at moderate temperatures and is a premier choice for critical spring, fastener, and structural applications in aerospace, medical, and downhole tooling industries. It conforms to standards such as **AMS 5758** and **ASTM F562**. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of 35N Alloy per AMS 5758 and ASTM F562 is as follows: | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Cobalt (Co)** | 34.00 - 38.00 | **Molybdenum (Mo)** | 9.00 - 10.50 | | **Nickel (Ni)** | 32.00 - 38.00 | **Manganese (Mn)** | ≤ 0.15 | | **Chromium (Cr)** | 19.00 - 21.00 | **Silicon (Si)** | ≤ 0.15 | | **Iron (Fe)** | ≤ 1.00 | **Carbon (C)** | ≤ 0.025 | | **Titanium (Ti)** | 0.50 - 1.50 | **Boron (B)** | ≤ 0.015 | **Key Metallurgical Feature:** 35N is a solid-solution strengthened, austenitic (FCC) alloy. Its ultra-high strength is achieved through a significant amount of cold work (drawing, rolling, etc.), which introduces a high density of dislocations and defects into the microstructure. A subsequent low-temperature aging heat treatment can provide a modest increase in strength by the precipitation of coherent phases, but its primary strengthening mechanism remains cold work. --- #### **2. Physical Properties** Typical physical properties for 35N alloy are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.43 g/cm³ | 0.304 lb/in³ | | **Melting Range** | ~1320 - 1380 °C | ~2410 - 2520 °F | | **Thermal Conductivity (20°C)** | 13.0 W/m·K | 90.1 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-400°C)** | 12.6 μm/m·°C | 7.0 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 234 GPa | 34.0 x 10⁶ psi | | **Electrical Resistivity** | 1.02 μΩ·m | - | | **Magnetic Permeability** | Essentially Non-Magnetic (≤ 1.005 μ) | | --- #### **3. Mechanical Properties (Typical for Cold Worked & Aged Condition)** Mechanical properties are directly related to the degree of cold work. The following are typical for wire or strip in a heavily cold-worked and aged condition. **Common Condition:** Cold Worked (to various strength levels) + Aged at ~480-540°C (900-1000°F). **Typical Room Temperature Mechanical Properties (High-Strength Condition):** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 1790 - 2070 MPa (260 - 300 ksi) | | **Yield Strength (0.2% Offset)** | 1655 - 1930 MPa (240 - 280 ksi) | | **Elongation (in 2 inches)** | 5 - 10% | | **Modulus of Elasticity** | 234 GPa (34 x 10⁶ psi) | *Note: Softer, more ductile tempers are also available for forming, with subsequent heat treatment to achieve final strength.* --- #### **4. International Standards & Specifications** 35N is covered by several key aerospace and medical standards. **Primary Specifications:** * **UNS:** R30035 * **AMS:** **AMS 5758**: Wire, Corrosion Resistant, High Strength, 35Co - 35Ni - 20Cr - 10Mo, Cold Drawn and Precipitation Heat Treated. * **ASTM:** **ASTM F562**: Standard Specification for Wrought 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy for Surgical Implant Applications (UNS R30035). **Other/Related Standards:** * **Proprietary Specifications:** Often supplied to OEM-specific standards for springs, fasteners, and downhole tools. * **AMS 5844:** Covers a similar alloy (MP35N®) which is a multi-phase version achieving even higher strengths through a different thermomechanical processing route. --- #### **5. Product Applications** The unique properties of 35N make it ideal for highly stressed, critical applications where reliability is paramount. * **Aerospace & Defense:** * High-performance springs (e.g., for actuators, valves, and flight controls) * Critical fasteners and bolts * Non-magnetic, high-strength structural components * Bellows and flexible shafts * **Medical Devices:** * Components for implantable devices (conforming to ASTM F562) * Guidewires, stems, and other high-strength, corrosion-resistant parts * **Oil & Gas (Downhole Tools):** * Non-magnetic drill collars (NMDC) * Springs, seals, and sensing components for Measurement-While-Drilling (MWD) and Logging-While-Drilling (LWD) tools that require high strength and corrosion resistance in sour service environments. --- #### **Summary of Key Advantages** * **Ultra-High Strength:** Achieves some of the highest tensile and yield strengths available among cold-worked, non-magnetic alloys. * **Excellent Fatigue Resistance:** Withstands high cyclic loading, making it exceptionally well-suited for spring applications. * **Essentially Non-Magnetic:** Maintains a very low magnetic permeability even in the heavily cold-worked condition. * **Good Corrosion Resistance:** Offers resistance to a wide variety of corrosive environments, including saltwater and sour gas (H₂S). * **Good Ductility for Strength Level:** Provides useful elongation despite its extremely high strength, which is critical for component reliability. **Disclaimer:** The information provided here is for reference purposes. Specific properties and performance are dependent on the degree of cold work, heat treatment, and final product form. For critical applications, always consult the official material specifications and the alloy producer's data sheets.

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 3137 gallon liquid totes Special package is available on request.