Alloy 800,Incoloy 800 Fittings,N08800,E FORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA15，American Specs:AMS 5766 Bar and Forgings AMS 5871 Sheet, Strip and Plate ASTM B408 ASTM B564 ASTM A240 ASTM A480，German Specs:WS 1.4876 WS 1.4958 WS 1.4959

### **Product Datasheet: Alloy 800 / Incoloy 800 / UNS N08800 Fittings** #### **1. Overview** Alloy 800 (commercially known as **Incoloy 800** and designated **UNS N08800**) is a nickel-iron-chromium superalloy renowned for its exceptional strength and resistance to oxidation and carburization at high temperatures. This datasheet focuses on **fittings** manufactured from this alloy, which are critical components for constructing corrosive and high-temperature piping systems. Incoloy 800 fittings are designed to connect pipes, change direction, branch off, or change pipe size in demanding environments where standard stainless steels are inadequate. **Key Characteristics for Fittings:** * **Excellent High-Temperature Strength:** Maintains mechanical integrity and pressure-containing capabilities in long-term service up to 1100°F (595°C). * **Outstanding Oxidation & Carburization Resistance:** Ideal for furnace and reactor applications where carbon absorption weakens other materials. * **Good Corrosion Resistance:** Resists a wide range of aqueous corrodents, including acids, alkalis, and seawater. * **Stabilized Structure:** The addition of Titanium stabilizes the alloy against sensitization (chromium carbide precipitation) during welding and high-temperature exposure, preventing intergranular corrosion. * **Fabricability:** Can be readily formed and welded into complex fitting geometries using standard techniques. --- #### **2. Chemical Composition (Weight % - Typical)** The chemical composition is meticulously controlled to ensure consistent performance in finished fittings. | Element | Content (%) | Role and Effect | | :--- | :--- | :--- | | **Nickel (Ni)** | 30.0 - 35.0 | Confers austenitic structure, ductility, and resistance to chloride stress corrosion cracking and reducing atmospheres. | | **Chromium (Cr)** | 19.0 - 23.0 | Provides resistance to oxidation, sulfidation, and corrosion. | | **Iron (Fe)** | Balance (~39.5%) | The base element of the alloy. | | **Carbon (C)** | 0.05 - 0.10 | Enhances high-temperature strength. | | **Manganese (Mn)**| ≤ 1.5 | Aids in deoxidation during melting. | | **Silicon (Si)** | ≤ 1.0 | Improves resistance to oxidation and carburization. | | **Sulfur (S)** | ≤ 0.015 | Impurity, kept low to preserve hot workability and weldability. | | **Aluminum (Al)** | 0.15 - 0.60 | Combined with Ti, it provides strengthening. | | **Titanium (Ti)** | 0.15 - 0.60 | **Crucially stabilizes the alloy** by forming stable carbides, preventing chromium depletion at grain boundaries. | --- #### **3. Physical Properties (Typical for Wrought Material)** | Property | Value | | :--- | :--- | | **Density** | 0.29 lb/in³ (8.03 g/cm³) | | **Melting Point** | 2470-2520°F (1355-1385°C) | | **Specific Heat** (68°F / 20°C) | 0.11 Btu/lb·°F (460 J/kg·K) | | **Thermal Conductivity** (68°F / 20°C) | 6.8 Btu·in/hr·ft²·°F (11.5 W/m·K) | | **Mean Coefficient of Thermal Expansion** (70-1000°F / 20-540°C) | 8.9 x 10⁻⁶/°F (16.0 x 10⁻⁶/°C) | | **Modulus of Elasticity** | 29.1 x 10⁶ psi (201 GPa) | --- #### **4. International Standards for Fittings** Incoloy 800 fittings are manufactured to meet stringent international standards that govern their dimensions, tolerances, material chemistry, and pressure ratings. | Standard Type | Standard Number | Title / Scope | | :--- | :--- | :--- | | **Material Specification** | ASTM B366 / ASME SB-366 | Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fitting. | | **Material Specification** | ASTM B564 / ASME SB-564 | Standard Specification for Nickel Alloy Forgings (for forged fittings like socket-weld). | | **Dimensional Standard** | ASME B16.9 / B16.11 / B16.28 | Standard for Steel Butt-Weld / Socket-Weld Fittings and dimensions. | | **Dimensional Standard** | MSS SP-43 / SP-97 | Standards for Wrought Stainless Steel Butt-Welding Fittings. | | **European Material** | DIN 2.4858 (Werkstoff Nr. 1.4876) | Nickel-Iron-Chromium alloy for high-temperature service. | | **UNS Designation** | UNS N08800 | Unified Numbering System. | --- #### **5. Product Applications** Incoloy 800 fittings are specified for critical piping systems in the following industries: * **Chemical & Petrochemical Processing:** * Ethylene and steam methane reformer furnace pigtails, transfer lines, and outlet headers. * Fittings in systems handling hot nitric acid, nitrates, and other corrosive chemicals. * Catalyst support systems. * **Power Generation:** * Superheater and reheater tubing systems in fossil fuel plants. * High-temperature steam and water lines. * Components in nuclear power systems. * **Heat Treating Industry:** * Piping and fittings for radiant tubes, retorts, and annealing furnaces. * Carburizing and nitriding atmosphere equipment. * **Industrial Heating:** * Fittings for heating element sheathing and heat exchanger piping. **Common Fitting Types Available:** * **Butt-Weld Fittings:** Elbows (90°, 45°, 180°), Tees, Reducers, Caps, Stub Ends. * **Socket-Weld Fittings:** Elbows, Tees, Couplings, Unions. * **Threaded Fittings:** Nipples, Couplings, Elbows, Tees. --- **Conclusion** Alloy 800 / Incoloy 800 (UNS N08800) fittings are high-performance components engineered for reliability in aggressive high-temperature and corrosive environments. Their stabilized chemistry, excellent mechanical properties, and compliance with major international standards make them the preferred choice for constructing durable and safe piping systems in the petrochemical, power, and thermal processing industries.

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 1892 gallon liquid totes Special package is available on request.