Alloy 800,Incoloy 800 Other/Similar Specs,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 Series & Similar Specs (UNS N08800, N08810, N08811)** #### **1. Overview** The **Alloy 800** series, most famously commercialized under the **Incoloy 800** brand, is a family of nickel-iron-chromium superalloys designed for exceptional strength and resistance to oxidation and carburization at high temperatures. The base alloy, **Alloy 800 (UNS N08800)**, is versatile and widely used. However, to optimize performance for specific conditions, two enhanced grades were developed: **Incoloy 800H (UNS N08810)** and **Incoloy 800HT (UNS N08811)**. This datasheet provides a comparative overview of these three primary grades, highlighting their key differences in chemistry and application focus. **Summary of Key Variants:** | Grade | UNS Number | Key Characteristic | Primary Advantage | | :--- | :--- | :--- | :--- | | **Incoloy 800** | N08800 | Standard Grade | Good all-around performance for corrosion resistance and medium-temperature strength. | | **Incoloy 800H** | N08810 | High Carbon, Annealed | **Enhanced Creep-Rupture Strength** at high temperatures due to higher carbon and an annealing treatment. | | **Incoloy 800HT** | N08811 | High Carbon, High Ti+Al, Annealed | **Optimized High-Temperature Strength** with a controlled Al+Ti ratio for additional stability and strength. | --- #### **2. Comparative Chemical Composition (Weight %)** The critical differences between these grades lie in the controlled ranges of Carbon, Aluminum, and Titanium. | Element | Incoloy 800 (N08800) | Incoloy 800H (N08810) | Incoloy 800HT (N08811) | Role and Effect | | :--- | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | 30.0 - 35.0 | 30.0 - 35.0 | 30.0 - 35.0 | Austenite former; provides ductility and resistance to reducing atmospheres. | | **Chromium (Cr)** | 19.0 - 23.0 | 19.0 - 23.0 | 19.0 - 23.0 | Confers oxidation, sulfidation, and corrosion resistance. | | **Iron (Fe)** | Balance | Balance | Balance | Base element. | | **Carbon (C)** | 0.05 - 0.10 | **0.05 - 0.10** | **0.05 - 0.10** | **Key differentiator.** Higher controlled range for elevated temperature strength. | | **Manganese (Mn)**| ≤ 1.5 | ≤ 1.5 | ≤ 1.5 | Deoxidizer. | | **Silicon (Si)** | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 | Enhances oxidation/carburization resistance. | | **Sulfur (S)** | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 | Impurity. | | **Aluminum (Al)** | 0.15 - 0.60 | 0.15 - 0.60 | **0.25 - 0.60** | **Key differentiator.** Strengthener. | | **Titanium (Ti)** | 0.15 - 0.60 | 0.15 - 0.60 | **0.25 - 0.60** | **Key differentiator.** Stabilizer and strengthener. | | **Ti + Al** | - | - | **≥ 0.85** | **Crucial for 800HT.** Ensures superior high-temperature strength. | **Note:** Both 800H and 800HT are **solution annealed** at a minimum of 2050°F (1120°C) to achieve a coarse grain size (ASTM 5 or coarser), which is essential for optimal creep rupture life. --- #### **3. Physical Properties (Typical for Wrought Material)** The physical properties are very similar across the three grades. | 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** These grades are covered by specific international standards that call out their unique requirements. | Product Form | Standard Number | Grades Covered & Notes | | :--- | :--- | :--- | | **Plate, Sheet, Strip** | ASTM B409 / ASME SB-409 | Covers N08800, N08810, and N08811. Specifies chemical and mechanical limits for each. | | **Forgings** | ASTM B564 / ASME SB-564 | Covers N08800, N08810, and N08811. | | **Seamless Pipe & Tube** | ASTM B163 / B517 / ASME SB-163 / SB-517 | Covers N08800, N08810, and N08811. | | **Welding Fittings** | ASTM B366 / ASME SB-366 | Covers N08800, N08810, and N08811. | | **Bar & Wire** | ASTM B408 / B166 | Covers these grades. | | **European Standard** | DIN 2.4858 / 2.4956 | 1.4876 typically refers to the 800H/HT composition. | | **UNS Designation** | N08800, N08810, N08811 | Unified Numbering System. | --- #### **5. Product Applications by Grade** The choice between grades depends on the specific service conditions. **Incoloy 800 (UNS N08800):** * **General Corrosion Service:** Heat exchanger tubes, process piping, and vessels in chemical plants. * **Moderate Temperature Applications:** Heating element sheaths, thermowells, and furnace components where extreme creep strength is not the primary driver. **Incoloy 800H (UNS N08810):** * **High-Temperature Structural Components:** Designed for long-term service in the 1100°F to 1500°F (595°C to 815°C) range. * **Petrochemical:** Reformer furnace components (pigtails, outlet headers, transfer line exchangers), catalyst support grids. * **Power Generation:** Superheater and reheater tubing, heat exchangers. * **Industrial Furnaces:** Radiant tubes, muffles, and retorts. **Incoloy 800HT (UNS N08811):** * **Most Demanding High-Temperature Applications:** All applications suitable for 800H, but where the **maximum creep-rupture strength** is required. * **Critical Petrochemical Components:** In ethylene cracking furnaces (e.g., tube supports, liner plates). * **Aerospace and Heat Treating:** Components requiring proven, certified high-temperature performance. The guaranteed Ti+Al ratio provides an extra margin of strength and stability. --- **Conclusion** The Alloy 800 series offers a versatile solution for a wide spectrum of high-temperature and corrosive environments. While the base **Alloy 800 (N08800)** provides excellent all-around performance, **Incoloy 800H (N08810)** and **800HT (N08811)** are specifically engineered for superior mechanical strength in the most demanding high-temperature structural applications. Selecting the correct grade is critical for ensuring long-term reliability, safety, and cost-effectiveness.

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 1894 gallon liquid totes Special package is available on request.