Alloy 25 / L605,Haynes 25,UNS R30605,E FORU

### **Alloy 25 / L605 / Haynes® 25 / UNS R30605** **Cobalt-Chromium-Tungsten-Nickel Superalloy for High-Temperature and Wear-Resistant Applications** 

 --- #### **1. Overview

** **Alloy 25**, commonly known by the trade names **Haynes® 25** or **L605**, is a cobalt-chromium-tungsten-nickel superalloy designed for high-temperature service and exceptional wear resistance. It combines excellent strength at temperatures up to 980°C (1800°F) with outstanding resistance to oxidation, hot corrosion, and wear. As a solid-solution strengthened alloy, it maintains good ductility and fabricability, making it suitable for a wide range of demanding aerospace, industrial, and medical applications. 

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

** The typical chemical composition of Haynes 25 / L605 is outlined below. The balance is Cobalt (Co). 

| Element | Content (%) | Key Function | 

| :--- | :--- | :--- | 

| **Cobalt (Co)** | Balance | Provides the matrix and solid-solution base with excellent high-temperature strength. | 

| **Chromium (Cr)** | 19.0 - 21.0 | Confers outstanding oxidation and hot corrosion resistance. | 

| **Tungsten (W)** | 14.0 - 16.0 | Primary solid-solution strengthener; enhances high-temperature strength and wear resistance. | 

| **Nickel (Ni)** | 9.0 - 11.0 | Stabilizes the austenitic (FCC) structure and improves fabricability. | 

| **Iron (Fe)** | 3.0 max | Controlled impurity. | 

| **Manganese (Mn)** | 1.0 - 2.0 | Aids in deoxidation and improves hot workability. | 

| **Silicon (Si)** | 0.30 - 0.60 | Enhances oxidation resistance and acts as a deoxidizer. | 

| **Carbon (C)** | 0.05 - 0.15 | Forms carbides for secondary strengthening and improved wear resistance. | 

| **Phosphorus (P)** | 0.03 max | Impurity, controlled to prevent embrittlement. | 

| **Sulfur (S)** | 0.03 max | Impurity, kept low to prevent hot shortness. | 

 --- #### **3. Physical Properties** 

| Property | Value / Condition | 

| :--- | :--- | 

| **Density** | 9.13 g/cm³ (0.330 lb/in³) | 

| **Melting Range** | ~ 1330 - 1410 °C (2425 - 2570 °F) | 

| **Mean Coefficient of Thermal Expansion** | 20 - 540°C (68 - 1000°F): **14.0 x 10⁻⁶/°C** (7.8 x 10⁻⁶/°F) | 

| **Thermal Conductivity** | 9.7 W/m·K (67 Btu·in/hr·ft²·°F) at 21°C (70°F) | 

| **Specific Heat** | 423 J/kg·K (0.101 Btu/lb·°F) at 21°C (70°F) | 

| **Electrical Resistivity** | 0.92 μΩ·m at 21°C (70°F) | | **Modulus of Elasticity (Young's Modulus)** | 242 GPa (35.1 x 10⁶ psi) at 21°C (70°F) | 

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

 --- #### **4. Mechanical Properties

 (Typical for Annealed Condition)** 

| Property | At Room Temperature | At 815°C (1500°F) | 

| :--- | :--- | :--- | 

| **Tensile Strength** | 950 - 1200 MPa (138 - 174 ksi) | ~240 MPa (35 ksi) | 

| **Yield Strength (0.2% Offset)** | 460 - 700 MPa (67 - 102 ksi) | ~170 MPa (25 ksi) | 

| **Elongation (in 50 mm / 2 in)** | 40% - 60% | 50% - 70% | 

| **Hardness (Rockwell B)** | 90 - 100 HRB | - | 

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

** Haynes 25 / L605 is covered by numerous international standards: 

 *   **ASTM:**    

*   **F90:** Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Surgical Implant Applications    

*   **B811:** Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Aerospace Application 

*   **AMS:**    

*   **AMS 5537:** Sheet, Strip, and Plate    

*   **AMS 5759:** Bar and Forging Stock 

*   **ISO:**    *   **ISO 5832-6:

** Implants for surgery — Metallic materials — Part 6: Wrought cobalt-nickel-chromium-molybdenum alloy 

*   **UNS:** R30605 

*   **EN (European Standard):** 2.4964 (Material Number for bar/wire) 

 --- #### **6. Product Applications

** Alloy 25 is widely used across multiple industries due to its unique combination of properties: 

 *   **Aerospace & Defense:

**    *   Gas turbine engine components (combustion chambers, afterburners, turbine blades)    

*   Exhaust nozzles and thrust reversers    

*   Hot section structural components 

*   **Medical Devices:

**    *   Orthopedic implants (especially where high wear resistance is needed)    

*   Surgical instruments    

*   Prosthetic components 

*   **Industrial Applications:

**    *   Heat treatment fixtures and baskets    

*   Nozzles for hot gases or corrosive media    

*   Wear plates and components 

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

** *   **Excellent High-Temperature Strength:

** Maintains strength and resists creep at temperatures up to 980°C (1800°F). 

*   **Outstanding Oxidation & Sulfidation Resistance:

** Performs well in oxidizing and sulfidizing atmospheres. 

*   **Superior Wear and Galling Resistance:

** Excellent for applications involving friction and wear. 

*   **Good Fabricability:

** Can be formed and welded using standard techniques, though it work-hardens rapidly. 

*   **Biocompatibility:** Approved for use in surgical implants (ASTM F90, ISO 5832-6). 

*   **Essentially Non-Magnetic:** Suitable for applications requiring magnetic transparency. 

 --- **Disclaimer:

** *Haynes® 25 is a registered trademark of Haynes International, Inc. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes.*

Packing of Alloy 25 / L605,Haynes 25,UNS R30605

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 1666 gallon liquid totes Special package is available on request.