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

British Specs:，American Specs:AMS 5537 Sheet AMS 5759 Bar & Rod AMS 5796 Welding wire AMS 5797 Covered welding rod，German Specs:

### **Technical Data Sheet: Alloy 25 (L605 / Haynes 25 / UNS R30605)** **A Cobalt-Chromium-Tungsten-Nickel Superalloy for High-Temperature and Severe Environments** #### **1. Overview** **Alloy 25**, also known commercially as **Haynes 25** or by its common designation **L605**, is a solid-solution strengthened cobalt-chromium-tungsten-nickel superalloy. It is renowned for its exceptional combination of: * **High-Temperature Strength:** Excellent tensile and creep strength up to 980°C (1800°F). * **Outstanding Oxidation Resistance:** Superior resistance to oxidizing atmospheres up to 1150°C (2100°F). * **Good Sulfidation Resistance:** Performs well in sulfidizing environments. * **Excellent Hot Corrosion Resistance:** Resists degradation from salt and other corrosive deposits. * **High Abrasion/Wear Resistance:** Inherently good wear characteristics. Unlike precipitation-hardened nickel alloys, L605 derives its strength directly from the solid-solution strengthening effect of its alloying elements, primarily tungsten, making it stable and not prone to age-embrittlement after long-term exposure. It is also readily fabricable and weldable. #### **2. Chemical Composition (Typical Weight %)** The composition is balanced for optimal high-temperature performance and environmental resistance. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Provides the base matrix and solid-solution strength; imparts inherent wear resistance. | | **Chromium (Cr)** | 19.0 - 21.0 | Confers outstanding oxidation and hot corrosion resistance. | | **Tungsten (W)** | 14.0 - 16.0 | Primary solid-solution strengthener; significantly enhances high-temperature strength. | | **Nickel (Ni)** | 9.0 - 11.0 | Stabilizes the FCC (face-centered cubic) structure, improving ductility and fabricability. | | **Iron (Fe)** | 3.0 max | Impurity control. | | **Manganese (Mn)** | 1.0 - 2.0 | Aids in sulfur control and improves hot workability. | | **Silicon (Si)** | 0.30 - 0.60 | Deoxidizer during melting; improves oxidation resistance. | | **Carbon (C)** | 0.05 - 0.15 | Forms carbides for improved wear resistance and modest grain boundary strengthening. | | **Phosphorus (P)** | 0.03 max | Impurity control. | | **Sulfur (S)** | 0.03 max | Impurity control. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Point** | ~1330 - 1410 °C (~2425 - 2570 °F) | | **Specific Heat Capacity** | ~ 420 J/kg·K (at 20°C) | | **Thermal Conductivity** | 9.6 W/m·K (at 20°C); Increases with temperature. | | **Coefficient of Thermal Expansion** | 12.5 μm/m·K (20 - 100°C); 17.8 μm/m·K (20 - 1000°C) | | **Electrical Resistivity** | ~ 0.92 μΩ·m | | **Magnetic Permeability** | Essentially non-magnetic | #### **4. Mechanical Properties (Typical for Annealed Condition)** * **Room Temperature Tensile Properties:** * **Tensile Strength:** 950 - 1200 MPa (138 - 174 ksi) * **0.2% Yield Strength:** 450 - 600 MPa (65 - 87 ksi) * **Elongation:** 50 - 60% * **Hardness:** Rockwell B 95 - 105 * **High-Temperature Strength:** * Retains significant strength at elevated temperatures. For example, at 870°C (1600°F), it typically maintains a tensile strength of over 200 MPa (29 ksi). * Excellent **creep rupture strength** and stress-to-rupture capability. #### **5. International Standards & Specifications** Alloy 25 / L605 is covered by a wide range of international standards for various product forms. | Standard Organization | Standard Designation | Form | | :--- | :--- | :--- | | **Aerospace (SAE/AMS)** | **AMS 5537** | Sheet, Strip, and Plate | | **Aerospace (SAE/AMS)** | **AMS 5759** | Bar, Forgings, and Rings | | **ASTM International** | **ASTM F90** | Bar, Wire, Sheet, Strip, and Plate | | **Unified Numbering System (UNS)** | **UNS R30605** | All Forms | | **European (EN)** | **2.4964** (Material Number) | - | | **AECMA (PrEN)** | **PrEN 3980** | - | #### **6. Product Applications** L605 is a versatile alloy used across several high-performance industries: * **Aerospace & Gas Turbine Engines:** * **Combustor Liners and Flame Holders** * **Turbine Nozzle Guides and Vanes** * **Afterburner Components** * **Exhaust Seals and Ducting** * **Spray Bars** * **Medical Devices:** * **Orthopedic Implants:** Particularly in load-bearing applications like hip and knee stems due to its high strength, corrosion resistance, and biocompatibility. * **Surgical Instruments** (for longevity and corrosion resistance). * **Industrial & Chemical Processing:** * Heat treatment fixtures (baskets, trays). * Components in furnaces and radiant tubes. * Fasteners and components for severe environments. * **Other Applications:** * **Aerospace Fasteners** * **Hot Extrusion Tooling** #### **7. Similar & Competing Alloys** * **Haynes 188:** Another cobalt-based alloy with superior oxidation resistance and slightly different strength profile due to Lanthanum addition. * **Hastelloy X (UNS N06002):** A nickel-based alloy with excellent strength and oxidation resistance, often used in similar gas turbine applications. * **Inconel 617 (UNS N06617):** A nickel-chromium-cobalt-molybdenum alloy with very high temperature strength and oxidation resistance. * **Stellite 6:** A cobalt-chromium-tungsten alloy primarily known for extreme wear resistance, with lower high-temperature strength than L605. **Key Differentiator of L605:** It offers one of the best all-around combinations of high-temperature strength, oxidation resistance, fabricability, and wear resistance among the cobalt-based superalloys. --- **Disclaimer:** This data sheet is for informational purposes only. The information is representative and not guaranteed. For specific design and procurement, always consult the official specifications and the material producer's latest data.

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 2196 gallon liquid totes Special package is available on request.