MP159,MP159,UNS R30159,E FORU

### **MP159 / UNS R30159

** **Multiphase Cobalt-Nickel-Chromium Superalloy for Ultra-High Strength Applications

** --- #### **1. Overview** **MP159** is a multiphase cobalt-nickel-chromium superalloy renowned for its exceptional combination of ultra-high strength, good ductility, and excellent corrosion resistance. This alloy achieves its remarkable properties through a complex multistep aging process that produces a unique microstructure with multiple strengthening phases. MP159 maintains

 outstanding strength and toughness at both cryogenic and elevated temperatures up to 650°C (1200°F), making it particularly valuable for aerospace fasteners and other critical high-stress components.

 --- #### **2. Chemical Composition (Weight %)

** The typical chemical composition of MP159 is outlined below. 

| Element | Content (%) | Key Function | 

| :--- | :--- | :--- | 

| **Cobalt (Co)** | 35.0 - 40.0 | Forms the primary matrix and contributes to solid-solution strengthening. | 

| **Nickel (Ni)** | 25.0 - 30.0 | Stabilizes the austenitic structure and enhances corrosion resistance. | 

| **Chromium (Cr)** | 18.0 - 20.0 | Provides excellent corrosion and oxidation resistance. | 

| **Iron (Fe)** | 8.0 - 10.0 | Contributes to solid-solution strengthening and cost optimization. | 

| **Molybdenum (Mo)** | 6.0 - 8.0 | Enhances strength and stability through solid-solution hardening. | 

| **Titanium (Ti)** | 2.5 - 3.25 | Forms coherent precipitates for primary strengthening. | 

| **Niobium (Nb)** | 0.25 - 0.75 | Contributes to precipitation hardening and grain refinement. | 

| **Aluminum (Al)** | 0.10 - 0.30 | Aids in precipitation hardening and oxidation resistance. | 

| **Manganese (Mn)** | 0.15 max | - | 

| **Silicon (Si)** | 0.15 max | - | 

| **Carbon (C)** | 0.04 max | - | 

| **Boron (B)** | 0.003 - 0.010 | Enhances grain boundary strength and creep resistance. | 

 --- #### **3. Physical Properties** 

| Property | Value / Condition | 

| :--- | :--- | 

| **Density** | 8.31 g/cm³ (0.300 lb/in³) | 

| **Melting Range** | ~ 1315 - 1425 °C (2400 - 2600 °F) | 

| **Mean Coefficient of Thermal Expansion** | 20 - 540°C (68 - 1000°F): **14.4 x 10⁻⁶/°C** (8.0 x 10⁻⁶/°F) | 

| **Thermal Conductivity** | 10.5 W/m·K (73 Btu·in/hr·ft²·°F) at 21°C (70°F) | 

| **Specific Heat** | 430 J/kg·K (0.103 Btu/lb·°F) at 21°C (70°F) | 

| **Electrical Resistivity** | 1.10 μΩ·m at 21°C (70°F) | 

| **Modulus of Elasticity (Young's Modulus)** | 234 GPa (34.0 x 10⁶ psi) at 21°C (70°F) | 

| **Magnetic Permeability** | Essentially non-magnetic in aged condition. | 

 --- #### **4. Mechanical Properties

 (Typical for Aged Condition)** 

 | Property | At Room Temperature | At 425°C (800°F) | At 650°C (1200°F) | 

| :--- | :--- | :--- | :--- | 

| **Tensile Strength** | 1620 MPa (235 ksi) | 1380 MPa (200 ksi) | 1035 MPa (150 ksi) | 

| **Yield Strength (0.2% Offset)** | 1515 MPa (220 ksi) | 1240 MPa (180 ksi) | 895 MPa (130 ksi) | 

| **Elongation (in 50 mm / 2 in)** | 12% | 14% | 18% | 

| **Reduction of Area** | 45% | 48% | 52% | 

| **Hardness (Rockwell C)** | 46 HRC | - | - | 

 --- #### **5. International Standards

** MP159 is covered by the following international specifications: 

 *   **AMS:**    

*   **AMS 5842:** Bar, Forgings, and Rings 

*   **ASTM:**    *   **F** (Aerospace Materials Specification) 

*   **UNS:** R30159 *   **Aerospace Standards:**    

*   **NAS:** National Aerospace Standard Fasteners    

*   **MS:** Military Standard Fasteners

 --- #### **6. Product Applications** 

 MP159 is primarily used in the most demanding applications requiring ultra-high strength: 

 *   **Aerospace Fastening Systems:

**    *   High-strength bolts and nuts    

*   Engine mounting bolts    

*   Critical structural fasteners    

*   Landing gear components 

*   **Defense Applications:

**    *   Military aircraft components    

*   Missile systems    

*   Armament systems 

*   **Specialty Components:

**    *   High-performance springs    

*   Valve components    

*   Special fasteners for corrosive environments 

*   **Oil & Gas:

**    *   Downhole tools and components    

*   High-strength fasteners for offshore platforms 

 --- #### **7. Key Characteristics & Advantages

** *   **Ultra-High Strength:** Exceptional tensile and yield strength properties 

*   **Excellent Strength Retention:

** Maintains mechanical properties from cryogenic temperatures to 650°C (1200°F) 

*   **Good Stress Corrosion Cracking Resistance:

** Performs well in corrosive environments under high stress 

*   **Excellent Fatigue Strength:

** Superior resistance to cyclic loading conditions 

*   **Good Ductility:** Maintains reasonable elongation despite ultra-high strength 

*   **Non-Magnetic Properties:** Essential for applications requiring magnetic transparency 

*   **Superior Fastener Performance:** Ideal for critical aerospace and defense fastening applications 

 --- **Disclaimer:

** *The values provided are typical and for informational purposes only. For critical applications, especially in aerospace and defense, always consult the official material data sheets from the supplier and relevant design codes. MP159 requires specialized heat treatment processing to achieve its optimal properties.*

Packing of MP159,MP159,UNS R30159

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 1671 gallon liquid totes Special package is available on request.