Alloy 28，Incoloy 028 Foil，Shim，UNS N08028,E FORU

British Specs:，American Specs:，German Specs:WS 1.4563

### **Product Introduction: Alloy 28 (UNS N08028) Foil & Shim Stock** **Alloy 28 Foil and Shim Stock** represents a thin-gauge, versatile form of the renowned nickel-iron-chromium superalloy. Known by its common trade name **Incoloy 028**, this product is engineered for applications demanding exceptional corrosion resistance in confined spaces, as a gasketing material, or as a protective layer. Supplied in the annealed condition to ensure optimal formability and ductility, this thin material retains the full chemical resistance of the alloy, making it an ideal choice for solving complex corrosion problems in chemical processing, aerospace, and other high-tech industries. --- ### **Chemical Composition (Weight %)** The composition is meticulously controlled to guarantee the alloy's performance, even in thin sections. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | 29.0 - 32.0 | Provides fundamental corrosion resistance and stabilizes the austenitic matrix. | | **Chromium (Cr)** | 26.0 - 28.0 | Confers resistance to oxidizing corrosives. | | **Iron (Fe)** | Balance | Base element. | | **Molybdenum (Mo)** | 3.0 - 4.0 | Crucial for resisting pitting and crevice corrosion from chlorides. | | **Copper (Cu)** | 0.6 - 1.4 | Enhances resistance to sulfuric and phosphoric acids. | | **Manganese (Mn)** | ≤ 2.0 | - | | **Silicon (Si)** | ≤ 1.0 | Improves resistance to oxidizing acids. | | **Carbon (C)** | ≤ 0.030 | Kept low to prevent sensitization. | | **Sulfur (S)** | ≤ 0.030 | - | --- ### **Physical & Mechanical Properties (Typical for Annealed Foil/Shim)** The properties of foil and shim stock are critical for design and fabrication. | Property | Value / Description | | :--- | :--- | | **Density** | 8.0 g/cm³ (0.289 lb/in³) | | **Melting Point** | 1370 - 1400 °C (2500 - 2550 °F) | | **Thermal Expansion** | 14.2 μm/m·°C (20-100°C) | | **Modulus of Elasticity** | 200 GPa (29 x 10⁶ psi) | | **Tensile Strength** | ~ 620 - 690 MPa (90 - 100 ksi) | | **Yield Strength (0.2% Offset)** | ~ 240 MPa (35 ksi) min | | **Elongation** | 35% min (typical) | | **Key Characteristics** | **Excellent Ductility, High Strength-to-Weight Ratio, Good Thermal Conductivity, Non-magnetic.** | --- ### **Standard Thickness and Available Forms** Foil and shim stock are typically defined by their thickness: * **Foil:** Generally considered to be thicknesses less than 0.1 mm (0.004 inches / 4 mils). * **Shim Stock:** Typically ranges from 0.1 mm up to approximately 1.0 mm (0.004 to 0.040 inches). **Available Forms:** * **Coils:** For automated production and gasket cutting. * **Sheets:** For manual cutting and prototyping. * **Slit Strip:** To specific widths. * **Pre-cut Shapes:** Die-cut into specific gasket or spacer profiles. --- ### **International Standards for Strip, Foil, and Shim** While specific "foil" standards are less common, the material is supplied to standards governing thin flat rolled products. | Standard Body | Standard Number | Title (Scope) | | :--- | :--- | :--- | | **ASTM** | B906 | *Standard Specification for General Requirements for Flat-Rolled Nickel and Nickel Alloys Plate, Sheet, and Strip* | | **ASTM / ASME** | SB-709 / SB-906 | *Specification for Nickel-Iron-Chromium Alloy Sheet, Plate, and Strip (ASME Boiler Code version)* | | **DIN** | 17750 | *Wrought Nickel and Nickel Alloys - Nickel-Iron-Chromium Alloy NiCr29Fe - Technical Delivery Conditions* | | **UNS** | **N08028** | The unified numbering system code ensures material traceability. | *Note: The specific thickness range (foil vs. sheet) is defined within the purchase specification with the supplier.* --- ### **Product Applications** The unique combination of thinness and extreme corrosion resistance makes Alloy 28 foil and shim indispensable in several critical applications: 1. **Chemical Processing Gaskets & Seals:** * Used for die-cut spiral-wound gaskets and flat seals for flanges in pumps, valves, and reactors handling hot sulfuric acid, phosphoric acid, and chloride-containing streams. * Serves as a lining or shim to isolate less resistant materials from corrosive fluids. 2. **Electrochemical Cells:** * Used as bipolar plates, current collectors, or structural components in advanced electrolysis and fuel cell systems where a thin, conductive, and highly resistant material is required. 3. **Aerospace & Defense:** * **Shimming:** For precise alignment of components in jet engines and airframes, especially in areas exposed to aggressive atmospheres. * **Thermal Management:** As a thin, resistant heat shield or spacer in high-temperature environments. 4. **High-Temperature Furnace Components:** * Used as thin thermal barriers, radiation shields, and internal liners due to its high-temperature scaling resistance. 5. **Pharmaceutical & Food Processing:** * As a diaphragm or membrane in equipment requiring a thin, non-contaminating, and easily cleanable (corrosion-resistant) surface. 6. **Laboratory & Research Equipment:** * Fabricated into custom containers, shields, and sample holders for experiments involving highly corrosive chemicals. --- ### **Fabrication and Handling** * **Forming:** Excellent ductility in the annealed state allows for easy bending, stamping, and deep drawing. * **Joining:** Can be welded using GTAW (TIG) and GMAW (MIG) processes with matching filler metal (e.g., ERNiCrMo-4). * **Cutting:** Easily sheared, punched, or blanked. Laser and waterjet cutting are highly effective for complex shapes. * **Surface:** Typically supplied with a matte finish. Can be polished to a mirror finish for specific applications. ### **Other / Similar Alloys in Foil/Shim Form** * **Alloy 20 (UNS N08020):** Good sulfuric acid resistance, but lower chloride resistance. * **Hastelloy C-276 (UNS N10276):** Superior resistance to a wider range of corrosive chemicals, including oxidizing chlorides. * **Inconel 625 (UNS N06625):** Higher strength at temperature and excellent fatigue strength. * **316L Stainless Steel (UNS S31603):** A cost-effective option for less severe corrosive environments. **Conclusion:** **Alloy 28 (UNS N08028) Foil and Shim Stock** is a high-performance, thin-gauge material that extends the alloy's renowned resistance to sulfuric acid and chlorides into applications requiring precision, minimal weight, and compact design. Its availability in coils, sheets, and custom-cut shapes makes it a critical engineering solution for creating reliable seals, spacers, and components in the world's most demanding industrial 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 2701 gallon liquid totes Special package is available on request.