Alloy 188,Haynes 188 Sheet,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 Sheet / UNS R30188) Cobalt-Based Superalloy** **Overview** **Alloy 188** (commercially known as **Haynes 188**, and standardized as **UNS R30188**) is an advanced cobalt-chromium-nickel-tungsten wrought superalloy specifically engineered for extreme high-temperature applications. The **Haynes 188 Sheet** product form represents a versatile material solution for fabricating components requiring excellent formability, weldability, and resistance to aggressive environments. This solution-strengthened alloy maintains outstanding mechanical properties and microstructural stability at temperatures up to 1100°C (2000°F), making it ideal for aerospace and industrial applications where reliability under thermal cycling conditions is paramount. The alloy's exceptional oxidation resistance is derived from its high chromium content, while the strategic addition of Lanthanum provides remarkable scale adhesion properties, preventing spallation during rapid thermal cycles. Available in various thicknesses, Haynes 188 Sheet can be readily formed, stamped, and welded into complex configurations while maintaining its superior high-temperature performance characteristics. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Haynes 188 Sheet meets rigorous international standards: | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Forms the primary matrix providing exceptional thermal fatigue resistance and elevated temperature strength | | **Chromium (Cr)** | 20.0 - 24.0 | Imparts outstanding oxidation, sulfidation, and hot corrosion resistance | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic structure and enhances fabricability | | **Tungsten (W)** | 13.0 - 15.0 | Provides solid solution strengthening for superior creep resistance | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Lanthanum (La)** | 0.03 - 0.12 | Enhances oxide scale adhesion under thermal cycling conditions | | **Manganese (Mn)**| ≤ 1.25 | Improves hot workability and sulfur control | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05 - 0.15 | Contributes to strength through 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 Sheet exhibits an optimal balance of strength and ductility for sheet metal fabrication: **Room Temperature Properties (Typical):** * **Tensile Strength:** 965 MPa (140 ksi) minimum * **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) minimum * **Elongation:** 50% minimum **Elevated Temperature Capability:** * Maintains excellent creep strength and rupture life up to **1100°C (2000°F)** * Demonstrates exceptional structural stability in the **980-1100°C (1800-2000°F)** range * Shows minimal strength degradation after prolonged exposure to high temperatures --- #### **4. Product Applications** **Haynes 188 Sheet** is specified for critical applications across multiple high-technology industries: * **Aerospace & Defense:** * **Combustion Chambers and Liners:** Formed sheet components for gas turbine engines * **Afterburner Components:** Sheet metal assemblies for military aircraft propulsion * **Exhaust System Parts:** Ducting, nozzles, and thermal protection systems * **Heat Shields** and **Firewalls** for aircraft engines * **Industrial Gas Turbines:** * **Transition Ducts:** Fabricated sheet assemblies directing hot combustion gases * **Combustor Liners:** Thin-walled components requiring thermal fatigue resistance * **Hot Gas Path Components:** Various sheet metal fabrications * **Heat Processing & Power Generation:** * **Furnace Components:** Radiant tubes, retorts, and inner covers * **Heat Treating Fixtures:** Baskets, trays, and charge carriers * **Heat Exchanger Parts** for high-temperature service * **Thermal Processing Liners** and **Protective Shields** --- #### **5. International Standards** Haynes 188 Sheet complies with the following international standards: | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Universal material designation | | **ASTM International** | **ASTM B435** | Standard Specification for Plate, Sheet, and Strip | | **Aerospace Material Spec.** | **AMS 5772** | Sheet, Strip, and Plate, Solution Heat Treated | | **Aerospace Material Spec.** | **AMS 5803** | Bar, Forgings, and Rings (for reference) | | **ASME Boiler & Pressure Vessel**| **SB-435** | Approved for ASME Code applications | | **European Standard** | **2.4684** | European material designation | --- **Summary** **Haynes 188 Sheet (UNS R30188)** represents a premium material solution for engineers designing components that must withstand extreme temperatures while maintaining structural integrity. Its unique combination of high-temperature strength, exceptional oxidation resistance, and superior fabricability makes it the material of choice for demanding applications in aerospace propulsion, power generation, and high-temperature industrial processing. The sheet form enables manufacturing of complex components through conventional and advanced metal forming techniques, providing design flexibility without compromising performance in the most challenging operational environments.

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 2228 gallon liquid totes Special package is available on request.