Alloy 188,Haynes 188 Plate,UNS R30188,E FORU

British Specs:，American Specs: AMS 5608 Sheet, Strip and Plate AMS 5801 Welding Wire，German Specs:

### **Product Introduction: Alloy 188 (Haynes 188 Plate / UNS R30188) Cobalt-Based Superalloy** **Overview** **Alloy 188** (commercially known as **Haynes 188**, and standardized as **UNS R30188**) is a premier cobalt-chromium-nickel-tungsten wrought superalloy. It is specifically engineered to provide exceptional performance in extreme environments characterized by high temperatures, aggressive oxidation, and thermal cycling. The **Haynes 188 Plate** product form is designed for fabricating large, robust structures and components that must maintain structural integrity under severe thermal and mechanical stress. As a solution-strengthened alloy, Haynes 188 Plate offers excellent microstructural stability over long periods of exposure at elevated temperatures, without significant degradation from aging. Its high chromium content forms a protective, adherent oxide scale, while the addition of Lanthanum (La) dramatically improves resistance to scale spallation during thermal cycling—a critical property for sheet and plate applications. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Haynes 188 Plate is controlled to meet strict international aerospace and industrial standards. | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Provides the base matrix with outstanding solid solution strength and thermal fatigue resistance. | | **Chromium (Cr)** | 20.0 - 24.0 | Imparts superior resistance to oxidation, sulfidation, and hot corrosion. | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic (face-centered cubic) structure, enhancing formability and weldability. | | **Tungsten (W)** | 13.0 - 15.0 | Acts as a potent solid solution strengthener, providing high-temperature creep strength. | | **Iron (Fe)** | ≤ 3.0 | Residual element. | | **Lanthanum (La)** | 0.03 - 0.12 | Critically improves oxide scale adhesion, preventing spallation and extending service life under thermal cycling. | | **Manganese (Mn)**| ≤ 1.25 | Aids in hot workability and controls sulfur. | | **Silicon (Si)** | ≤ 0.20 | Residual element. | | **Carbon (C)** | 0.05 - 0.15 | Contributes to strength through minor carbide formation. | | **Boron (B)** | ≤ 0.015 | Strengthens grain boundaries. | | **Phosphorus (P)**| ≤ 0.020 | Impurity control. | | **Sulfur (S)** | ≤ 0.015 | Impurity control. | --- #### **2. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Range** | 1330 - 1380 °C (2425 - 2515 °F) | | **Electrical Resistivity** | 1.02 μΩ·m at 21°C | | **Thermal Conductivity** | 10.1 W/m·K at 100°C | | **Thermal Expansion Coefficient** | 12.3 μm/m·°C (20 - 100°C) | | **Magnetic Permeability**| Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Annealed Condition)** Haynes 188 Plate provides an excellent combination of high strength and ductility, allowing for fabrication into complex components. **Room Temperature Properties (Typical):** * **Tensile Strength:** 965 MPa (140 ksi) min * **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) min * **Elongation:** 50% min **Elevated Temperature Performance:** * The alloy maintains useful tensile and creep-rupture strength up to approximately **1100°C (2000°F)**. * It is ideally suited for long-term structural applications in the **980-1100°C (1800-2000°F)** range. --- #### **4. Product Applications** **Haynes 188 Plate** is widely used in demanding applications across aerospace, industrial, and energy sectors where large, sheet-like components are required. * **Aerospace & Defense:** * **Combustion Chambers and Liners:** Fabricated from plate via forming and welding. * **Afterburner Components:** Structures and housings in military jet engines. * **Exhaust System Components:** Ducting, nozzles, and heat shields. * **Hot Air Seals** and **Flame Holders**. * **Industrial Gas Turbines:** * **Transition Ducts:** Directing hot combustion gases to the turbine section. * **Combustor Domes and Liners:** Critical hot-section components. * **Heat Processing & Power Generation:** * **Furnace Components:** Muffles, radiant tubes, and retorts. * **Heat Treating Fixtures:** Baskets, trays, and grids. * **Heat Exchanger Parts** for high-temperature service. * **Structural Components** in waste incineration and syngas systems. --- #### **5. International Standards** Haynes 188 Plate is covered by several key international standards that govern its production and quality. | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | The universal material identifier. | | **ASTM International** | **ASTM B435** | Standard Specification for **Plate, Sheet, and Strip** of UNS R30188. | | **Aerospace Material Spec. (AMS)** | **AMS 5772** | **Sheet, Strip, and Plate**, Cobalt Alloy, 20Cr-22Ni-14W-3Fe-2La, Solution Heat Treated. | | **Aerospace Material Spec. (AMS)** | **AMS 5803** | Bar, Forgings, and Rings. *(Reference for attached components)* | | **ASME Boiler & Pressure Vessel Code**| **SB-435** | Approved for use in code-regulated pressure vessel applications. | | **EN (European)** | **2.4684** | Material number under the European standard designation system. | --- **Summary** **Haynes 188 Plate (UNS R30188)** is a high-performance, versatile material form designed for the most challenging high-temperature structural applications. Its superior balance of high-temperature strength, exceptional environmental resistance, and excellent weldability and formability makes it an indispensable choice for fabricating critical components in aerospace propulsion, power generation, and high-temperature industrial processing. The plate form enables the construction of large, durable structures that can withstand the combined effects of heat, stress, and corrosion for extended service life.

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 2227 gallon liquid totes Special package is available on request.