MP35N Ni-Co-Cr-Mo Alloy, MP35N alloy,UNS R30035; AMS 5758; AMS 5844; AMS 5845; ANSI F562; ASTM F562,E FORU

### **Product Introduction: MP35N® Nickel-Cobalt-Chromium-Molybdenum Alloy** **MP35N® (UNS R30035)** is a unique nickel-cobalt-chromium-molybdenum alloy renowned for its exceptional combination of ultra-high strength, excellent corrosion resistance, and superior fatigue performance. This multiphase alloy achieves its remarkable properties through a specialized thermomechanical processing sequence that creates a multiaxial strengthening mechanism, combining both cold work and precipitation hardening effects. The alloy maintains excellent mechanical properties across a wide temperature range while providing outstanding resistance to various corrosive environments. The alloy's unique ability to achieve and maintain ultra-high strength levels while retaining good ductility and toughness makes it particularly valuable for critical applications in aerospace, medical, and marine engineering where reliability and performance are paramount. --- #### **1. Chemical Composition (Weight %)** The chemical composition of MP35N alloy per AMS 5758 is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 33.0 - 37.0 | **Cobalt (Co)** | 33.0 - 37.0 | | **Chromium (Cr)** | 19.0 - 21.0 | **Molybdenum (Mo)** | 9.0 - 10.5 | | **Titanium (Ti)** | 1.0 max | **Iron (Fe)** | 1.0 max | | **Manganese (Mn)** | 0.15 max | **Silicon (Si)** | 0.15 max | | **Carbon (C)** | 0.025 max | **Boron (B)** | 0.015 max | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.43 g/cm³ | 0.304 lb/in³ | | **Melting Range** | 1315 - 1440 °C | 2400 - 2625 °F | | **Thermal Conductivity** | 13.0 W/m·K | 90.1 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 12.5 μm/m·°C | 6.9 μin/in·°F | | **Specific Heat** | 430 J/kg·K | 0.103 Btu/lb·°F | | **Electrical Resistivity** | 1.04 μΩ·m | 625 Ω·cir mil/ft | | **Modulus of Elasticity** | 234 GPa | 33.9 x 10⁶ psi | **Mechanical Properties (Cold Worked + Aged Condition):** | Property | Value | |----------|-----------------| | **Tensile Strength** | 1790-2070 MPa | 260-300 ksi | | **Yield Strength (0.2% Offset)** | 1655-1930 MPa | 240-280 ksi | | **Elongation** | 8-12% | | **Reduction of Area** | 35-45% | | **Hardness (Rockwell C)** | 40-50 HRC | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Ultra-High Strength**: Exceptional strength-to-weight ratio capabilities - **Excellent Corrosion Resistance**: Outstanding performance in saltwater and chemical environments - **Superior Fatigue Strength**: Excellent resistance to cyclic loading conditions - **Multiphase Strengthening**: Unique combination of cold work and precipitation hardening - **Non-Magnetic Properties**: Essentially non-magnetic in all conditions - **Biocompatibility**: Suitable for medical implant applications **Product Applications:** MP35N alloy serves critical functions in demanding applications: - **Medical Devices**: - Orthopedic implants and bone screws - Pacemaker leads and components - Surgical instruments - Dental implants and prosthetics - **Aerospace & Defense**: - Aircraft fasteners and bolts - Helicopter rotor components - Missile systems - Spacecraft components - **Oil & Gas Industry**: - Downhole tool components - Well completion equipment - Subsea connectors - Valve components - **Marine Engineering**: - Marine fastening systems - Submarine components - Offshore platform hardware - Marine riser systems --- #### **4. International Standards & Specifications** MP35N alloy complies with comprehensive international standards: **Aerospace Material Specifications:** - **AMS 5758**: Bars, Forgings, and Rings - **AMS 5844**: Wire, Spring Quality - **AMS 5845**: Wire, Corrosion Resistant **Medical & General Specifications:** - **ASTM F562**: Wrought Cobalt-35Nickel-20Chromium-10Molybdenum Alloy - **ANSI F562**: Surgical Implant Applications - **ISO 5832-6**: Implants for surgery **Additional Standards:** - **UNS R30035**: Unified Numbering System - **ASME Code Case**: Pressure vessel applications - **NACE MR0175**: Sour service compliance --- #### **Summary of Key Advantages** - **Exceptional Strength Properties**: Ultra-high strength with good ductility - **Superior Corrosion Performance**: Excellent resistance to pitting and crevice corrosion - **Proven Reliability**: Extensive service history in critical applications - **Versatile Processing**: Can be processed to various strength levels - **Biocompatible**: Certified for medical implant applications - **Comprehensive Certification**: Meets major international quality standards **Technical Note**: MP35N alloy achieves its optimal properties through a specific processing sequence involving cold working (typically 40-60% reduction) followed by aging at 540-650°C (1000-1200°F). The alloy's unique multiphase structure provides exceptional resistance to crack propagation and fatigue failure. It maintains excellent corrosion resistance in chloride-containing environments, including seawater and chemical process streams. The material exhibits good weldability using matching filler metals, though post-weld heat treatment is recommended for critical applications. MP35N's non-magnetic characteristics remain stable even after severe cold working, making it particularly valuable for applications requiring both high strength and non-magnetic properties.

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 3180 gallon liquid totes Special package is available on request.