Alloy 800H,Incoloy 800H Plate,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 Datasheet: Alloy 800H / Incoloy 800H Plate (UNS N08810)** --- #### **1.0 Product Introduction** **Alloy 800H Plate** (commercially known as **Incoloy 800H Plate**, UNS **N08810**) is the plate product form of a nickel-iron-chromium superalloy specifically optimized for high-temperature service. The "H" designation indicates controlled chemistry with elevated carbon content (0.05-0.10%) and a specific annealing treatment that produces a coarse grain structure, delivering enhanced creep and stress-rupture properties compared to standard Alloy 800. This plate material is engineered to withstand extreme temperatures while maintaining excellent resistance to oxidation, carburization, and sulfidation, making it ideal for pressure vessels, structural components, and high-temperature processing equipment. --- #### **2.0 Chemical Composition** | Element | Content (%) (Per ASTM B409) | Role in the Alloy | |---------|------------------------------|-------------------| | **Nickel (Ni)** | 30.0 - 35.0 | Provides austenitic structure and resistance to oxidation and carburization | | **Chromium (Cr)** | 19.0 - 23.0 | Confers resistance to oxidation and sulfidation | | **Iron (Fe)** | ≥ 39.5 | Balance element forming the alloy matrix | | **Carbon (C)** | 0.05 - 0.10 | **Critical for "H" grade** - enhances creep resistance through solid solution strengthening | | **Aluminum (Al)** | 0.15 - 0.60 | Improves oxidation resistance through protective scale formation | | **Titanium (Ti)** | 0.15 - 0.60 | Provides stabilization and strengthening | | **Manganese (Mn)** | ≤ 1.50 | Enhances hot workability | | **Copper (Cu)** | ≤ 0.75 | - | | **Silicon (Si)** | ≤ 1.00 | Improves oxidation and carburization resistance | | **Sulfur (S)** | ≤ 0.015 | Impurity control | *Note: The ratio of (Al + Ti) must be ≥ 0.85% for N08810 specification.* --- #### **3.0 Physical Properties** | Property | Value | Condition | |----------|-------|-----------| | **Density** | 8.03 g/cm³ (0.29 lb/in³) | At 20°C (68°F) | | **Melting Range** | 1354-1384°C (2470-2520°F) | - | | **Specific Heat** | 460 J/kg·K (0.11 Btu/lb·°F) | At 21°C (70°F) | | **Thermal Expansion** | 16.6 × 10⁻⁶ /K (9.2 × 10⁻⁶ /°F) | 20-650°C (70-1200°F) | | **Thermal Conductivity** | 15.6 W/m·K (9.0 Btu·in/hr·ft²·°F) | At 21°C (70°F) | | **Electrical Resistivity** | 116 μΩ·cm (45.8 μΩ·in) | At 21°C (70°F) | | **Modulus of Elasticity** | 201 GPa (29.1 × 10⁶ psi) | At 21°C (70°F) | | **Magnetic Permeability** | < 1.05 | Essentially non-magnetic | --- #### **4.0 Mechanical Properties** **ASTM B409 - Plate Product (Annealed Condition)** - **Tensile Strength:** 450 MPa (65 ksi) minimum - **Yield Strength (0.2% Offset):** 170 MPa (25 ksi) minimum - **Elongation:** 30% minimum **Elevated Temperature Properties** - **Maximum Service Temperature:** 815°C (1500°F) continuous service - **Creep Strength:** Excellent retention up to 815°C (1500°F) - **Stress Rupture:** Superior performance under prolonged high-temperature exposure --- #### **5.0 International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **UNS** | **N08810** | Unified Numbering System designation | | **ASTM** | **B409/B409M** | Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip | | **ASME** | **SB-409** | ASME Boiler and Pressure Vessel Code Section I & VIII | | **EN/DIN** | **1.4876** | Material Number X8NiCrAlTi32-21 | | **ISO** | **6207** | Nickel alloy plate, sheet, and strip | --- #### **6.0 Product Applications** **Petrochemical Industry** - Steam methane reformer components - Ethylene cracking furnace parts - Reactor vessels and liners - High-temperature piping systems **Power Generation** - Heat exchanger plates - Boiler components - Nuclear power plant fixtures - Combustion chamber liners **Industrial Processing** - Heat treatment furnace components - Retorts and muffles - Radiant tubes - Process vessel fabrication **Special Applications** - Pressure vessel construction - Structural supports in high-temperature environments - Expansion bellows and flexible connectors - High-temperature tooling and fixtures --- #### **7.0 Fabrication Characteristics** **Welding** - Excellent weldability using SMAW, GTAW, GMAW processes - Recommended filler metals: ENiCrFe-2, ENiCrFe-3 - Post-weld heat treatment recommended for optimized properties **Forming** - Good hot and cold forming characteristics - Hot working temperature: 950-1200°C (1750-2200°F) - Annealing temperature: 980-1065°C (1800-1950°F) **Machining** - Can be machined using conventional methods - Requires positive rake angles and rigid setups - Recommended use of coolant for heavy machining --- #### **8.0 Key Characteristics Summary** - **Superior Creep Resistance:** Excellent long-term performance under stress at high temperatures - **Outstanding Oxidation Resistance:** Suitable for continuous service up to 815°C (1500°F) - **Excellent Carburization Resistance:** Maintains integrity in hydrocarbon environments - **Good Sulfidation Resistance:** Performs well in sulfur-containing atmospheres - **High-Temperature Strength:** Maintains mechanical properties under thermal stress - **Non-Magnetic Properties:** Suitable for specialized applications - **Excellent Fabricability:** Good welding and forming characteristics --- #### **9.0 Quality Assurance** Alloy 800H plate is supplied with full traceability and certification including: - Mill Test Certificate to ASTM B409 - Chemical Analysis Report - Mechanical Properties Test Results - Non-Destructive Testing Reports (as specified) - Heat Number Traceability **Typical Supply Conditions:** - Solution Annealed - Pickled and Descaled - Ultrasonic Testing available per requirements --- ### **Conclusion** **Alloy 800H / Incoloy 800H Plate (UNS N08810)** represents a premium plate product designed for critical high-temperature applications where reliability, longevity, and performance under extreme conditions are essential. Its combination of elevated temperature strength, corrosion resistance, and fabricability makes it the material of choice for demanding applications in petrochemical, power generation, and industrial processing sectors.

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 1902 gallon liquid totes Special package is available on request.