Alloy 188,Haynes 188 Foil,Shim,UNS R30188,E FORU

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

### **Product Technical Specification: Alloy 188 (Haynes 188 Foil & Shim / UNS R30188)** --- #### **1. Product Overview** **Alloy 188** (commercially known as **Haynes 188**, UNS R30188) foil and shim products represent the thin-gauge form of this premium cobalt-chromium-nickel-tungsten superalloy. These precision-rolled materials maintain the exceptional high-temperature capabilities of the alloy while offering unique advantages for applications requiring minimal thickness and maximum flexibility. Available in thicknesses from 0.025 mm (0.001") to 0.5 mm (0.020"), these products provide reliable performance in temperatures up to 1150°C (2100°F). The foil and shim forms are particularly valued for their ability to maintain dimensional stability and oxidation resistance in thin sections, making them ideal for thermal management, sealing, and spacing applications in extreme environments. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Metallurgical Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Matrix element providing high-temperature integrity in thin sections | | **Chromium (Cr)** | 20.0 - 24.0 | Forms protective oxide scale for oxidation resistance | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes austenitic structure and enhances rollability | | **Tungsten (W)** | 13.0 - 15.0 | Provides solid solution strengthening | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Lanthanum (La)** | 0.03 - 0.12 | Enhances oxide scale adhesion in thin sections | | **Manganese (Mn)**| ≤ 1.25 | Improves hot workability during rolling | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05 - 0.15 | Contributes to strength retention | | **Boron (B)** | ≤ 0.015 | Grain boundary strengthening | --- #### **3. Physical Properties** | Property | Value | Condition | | :--- | :--- | :--- | | **Density** | 9.13 g/cm³ | 25°C | | **Melting Range** | 1330-1380°C | Liquidus-Solidus | | **Thermal Conductivity** | 10.1 W/m·K | 100°C | | **Electrical Resistivity** | 1.02 μΩ·m | 25°C | | **Thermal Expansion Coefficient** | 12.3 μm/m·°C | 20-100°C | | **Surface Finish** | 0.2-0.8 μm Ra | Standard mill finish | --- #### **4. Mechanical Properties** **Standard Foil/Shim Properties (Annealed Condition):** *Thickness Range: 0.025-0.5 mm (0.001-0.020")* - **Tensile Strength:** 895-1100 MPa (130-160 ksi) - **Yield Strength (0.2% Offset):** 415-550 MPa (60-80 ksi) - **Elongation:** 35-50% - **Hardness:** 70-90 HRB **Elevated Temperature Performance:** - **Continuous Service:** Up to 1100°C (2000°F) - **Intermittent Service:** Up to 1150°C (2100°F) - **Oxidation Resistance:** Excellent in thin sections - **Thermal Fatigue Resistance:** Outstanding in constrained applications --- #### **5. Available Forms & Specifications** **Standard Thickness Tolerances:** - **Foil:** 0.025-0.15 mm (± 0.005 mm) - **Shim:** 0.15-0.5 mm (± 0.01 mm) - **Width Range:** 50-600 mm - **Length:** Coils or cut-to-length sheets **Standard Conditions:** - **Annealed:** Optimal for forming and stamping - **Temper Rolled:** For increased flatness - **Solution Treated:** Maximum high-temperature performance --- #### **6. Product Applications** **Aerospace & Defense:** - **Combustion Chamber Seals:** High-temperature gas path sealing - **Turbine Blade Shims:** Precise clearance control - **Heat Shield Layers:** Multi-layer insulation systems - **Sensor Mounting Pads:** Thermal protection for instrumentation **Industrial Processing:** - **Furnace Gaskets:** High-temperature atmosphere containment - **Heat Treating Fixtures:** Thin thermal barriers and spacers - **Vacuum System Shields:** Radiation shielding in thin sections - **Reactor Vessel Liners:** Corrosion-resistant barriers **Electronics & Special Applications:** - **Power Electronics Heat Spreaders:** Thermal management - **Vacuum Tube Components:** Thin structural elements - **Laboratory Equipment:** High-temperature gaskets and seals - **Crystal Growth Equipment:** Precision high-temperature fixtures --- #### **7. International Standards** | Standard Type | Standard Number | Specification | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Material designation | | **ASTM International** | **ASTM B435** | Sheet, Strip, and Foil | | **Aerospace Material** | **AMS 5772** | Sheet, Strip, and Foil | | **Military Standard** | **MIL-DTL-5037** | Foil and Thin Strip | | **European Standard** | **2.4684** | Material number | | **Thickness Standards** | **ASTM B248** | Tolerances for foil products | --- #### **8. Fabrication Characteristics** **Forming & Fabrication:** - **Blankability:** Excellent in annealed condition - **Punchability:** Suitable for precision stamping - **Bendability:** Minimum bend radius 2T (annealed) - **Weldability:** All conventional methods applicable with proper technique **Handling Considerations:** - **Edge Condition:** Deburred edges standard - **Surface Protection:** Interleaving paper available - **Cleaning Requirements:** Degrease before high-temperature service - **Storage Conditions:** Dry, controlled environment recommended --- #### **9. Quality Assurance** **Standard Testing:** - **Dimensional Verification:** Laser scanning and micrometer inspection - **Surface Quality:** Visual and microscopic examination - **Chemical Analysis:** Spectrographic verification - **Mechanical Testing:** Tensile and hardness testing by lot **Special Testing Available:** - **Flatness Measurement:** Laser flatness testing - **Surface Roughness:** Profilometer measurement - **Metallographic Examination:** Grain structure evaluation --- #### **Technical Summary** **Haynes 188 Foil and Shim (UNS R30188)** extend the exceptional high-temperature capabilities of this cobalt-based superalloy into applications requiring ultra-thin, flexible materials. These products maintain the alloy's characteristic oxidation resistance, thermal stability, and mechanical properties while offering the formability and conformability needed for precision sealing, spacing, and thermal management applications. The availability of these materials in controlled thin gauges enables innovative engineering solutions across aerospace, energy, and industrial sectors where conventional thicker materials cannot meet design requirements.

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 2233 gallon liquid totes Special package is available on request.