Alloy 800H,Incoloy 800H Pipe,N08810,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 Introduction: Alloy 800H / Incoloy 800H Pipe (UNS N08810)** **Alloy 800H Pipe** (commercially known as **Incoloy 800H Pipe** and designated as **UNS N08810**) is a nickel-iron-chromium superalloy pipe manufactured for high-temperature and corrosive service. It is the controlled-composition version of Alloy 800, optimized with higher carbon content and a specific thermal treatment to develop a coarse grain structure. The "H" designation is critical, indicating enhanced high-temperature properties, specifically superior creep and stress-rupture strength. This makes Alloy 800H pipe an indispensable material for transporting process gases and fluids at elevated temperatures in the most demanding industrial environments, such as steam methane reformers and ethylene cracking furnaces. --- ### **Chemical Composition** The chemical composition of Alloy 800H Pipe (N08810) is strictly controlled per material standards to ensure consistent performance. The typical composition ranges are as follows: | Element | Content (%) (Per ASTM B407 / B163) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | 30.0 - 35.0 | Provides austenitic structure, fundamental resistance to oxidation, and carburization. | | **Chromium (Cr)** | 19.0 - 23.0 | Confers resistance to oxidation, sulfidation, and other high-temperature corrosives. | | **Iron (Fe)** | ≥ 39.5 | Balance; forms the base of the alloy matrix. | | **Carbon (C)** | 0.05 - 0.10 | **Critical for "H" grade.** Strengthens the alloy at high temperatures, directly enhancing creep resistance. | | **Aluminum (Al)** | 0.15 - 0.60 | Improves oxidation resistance and contributes to strengthening. | | **Titanium (Ti)** | 0.15 - 0.60 | Works with Aluminum to provide stabilization and strengthening. | | **Manganese (Mn)** | ≤ 1.50 | Aids in hot workability. | | **Copper (Cu)** | ≤ 0.75 | - | | **Silicon (Si)** | ≤ 1.00 | Improves resistance to oxidation and carburization. | | **Sulfur (S)** | ≤ 0.015 | Impurity, kept low to prevent hot shortness. | *Note: The ratio of (Al + Ti) is typically controlled to be ≥ 0.85% for N08810.* --- ### **Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 0.29 lb/in³ (8.03 g/cm³) | | **Melting Range** | 2470-2520°F (1354-1384°C) | | **Specific Heat** | 0.11 Btu/lb·°F (460 J/kg·K) at 70°F (21°C) | | **Thermal Expansion** | 9.2 x 10⁻⁶ /°F (16.6 x 10⁻⁶ /K) | 70-1200°F (20-650°C) | | **Thermal Conductivity** | 9.0 Btu/hr·ft·°F (15.6 W/m·K) at 70°F (21°C) | | **Electrical Resistivity** | 45.8 μΩ·in (116 μΩ·cm) at 70°F (21°C) | | **Modulus of Elasticity** | 29.1 x 10⁶ psi (201 GPa) at 70°F (21°C) | | **Magnetic Permeability** | Typically < 1.05 (Essentially non-magnetic) | --- ### **Mechanical Properties (Typical for Pipe Product)** Mechanical properties for pipe are specified in standards like ASTM B407 for seamless pipe and ASTM B163 for seamless tube. The following are typical minimum requirements for the annealed condition. **ASTM B407 / B163 - Seamless Pipe & Tube** * **Tensile Strength:** 65 ksi (450 MPa) min * **Yield Strength (0.2% Offset):** 25 ksi (170 MPa) min * **Elongation:** 30% min *The key advantage of Alloy 800H pipe is its exceptional long-term creep and stress-rupture strength under internal pressure at temperatures up to 1500°F (815°C).* --- ### **International Standards for Pipe Product** Alloy 800H / N08810 pipe is covered by several key international standards. | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **UNS** | **N08810** | Unified Numbering System designation. | | **ASTM** | **B407** | Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube. | | **ASTM** | **B163** | Standard Specification for Seamless Nickel and Nickel-Alloy Condenser and Heat-Exchanger Tubes. | | **ASTM** | **B165** | Standard Specification for Nickel-Copper Alloy Seamless Pipe and Tube (sometimes referenced for specific sizes). | | **ASME** | **SB-407, SB-163** | ASME BPVC equivalents to ASTM standards, approved for code construction. | | **EN / DIN** | **1.4958 / 1.4876** | European material numbers (X5NiCrAlTi31-20 / X8NiCrAlTi32-21). 1.4876 is often the direct equivalent. | --- ### **Product Applications for Pipe Form** Alloy 800H pipe is specified for critical applications where high temperature, pressure, and corrosion resistance are simultaneous requirements. 1. **Petrochemical & Chemical Processing:** * **Steam Methane Reformer (SMR) Tubes:** The primary application. Used as catalyst tubes where the alloy withstands high internal pressure, extreme heat (1400-1800°F / 760-980°C), and a carburizing environment. * **Ethylene Cracking Furnace Tubes (Radiant Coils):** Transports hydrocarbons through high-temperature pyrolysis furnaces. * **Transfer Line Exchanger (TLE) Tubes:** For rapid quenching of cracked gas. * **Outlet Manifolds and Headers:** Collects process gases from multiple reactor tubes. 2. **Power Generation:** * **Superheater and Reheater Tubes** in advanced fossil fuel boilers. * **High-Temperature Heat Exchanger Tubes** for process heat and waste heat recovery systems. * **Piping Systems** for high-temperature steam and gas service. 3. **Industrial Furnaces:** * **Radiant Tubes** in heat-treating furnaces. * **Heat Recovery Systems** piping. 4. **Nuclear Power:** * **Intermediate Heat Exchanger Tubes** in some gas-cooled reactor designs. ### **Key Characteristics Summary** * **Exceptional Creep & Stress-Rupture Strength:** Essential for pressurized components under high thermal stress. * **Outstanding Carburization Resistance:** Critical for service in hydrocarbon processing environments. * **Excellent Oxidation Resistance:** Forms a protective, adherent chromium oxide scale. * **Good Metallurgical Stability:** Resists embrittling phase formation during long-term exposure. * **High-Temperature Strength:** Maintains structural integrity under load at temperatures up to 1500°F (815°C). * **Good Weldability and Fabricability:** Can be welded using matching or over-matching filler metals for system fabrication. In conclusion, **Alloy 800H / Incoloy 800H Pipe (UNS N08810)** is a premium, high-performance product form designed for the most critical high-temperature, high-pressure applications. Its ability to withstand simultaneous mechanical and thermal stresses in corrosive atmospheres makes it a cornerstone material in the petrochemical and power generation 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 1900 gallon liquid totes Special package is available on request.