Alloy 800HT,Incoloy 800HT Plate,N08811,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

**Technical Datasheet: Alloy 800HT / Incoloy 800HT Plate (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Plate** (commercially known as **Incoloy 800HT Plate**, UNS **N08811**) is a premium nickel-iron-chromium superalloy plate product engineered for extreme temperature applications requiring exceptional creep rupture strength and oxidation resistance. With enhanced chemistry featuring controlled carbon content (0.06–0.10%) and elevated aluminum+titanium (Al + Ti ≥ 1.20%), this alloy delivers superior performance at temperatures up to 815°C (1500°F). The plate form is specifically designed for fabrication into pressure vessels, heat treatment fixtures, and structural components in aggressive thermal environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B409/ASME SB-409) | Role | |---------|----------------------------------|------| | **Nickel (Ni)** | 30.0–35.0 | Austenitic matrix stability, oxidation/carburization resistance | | **Chromium (Cr)** | 19.0–23.0 | High-temperature oxidation and sulfidation resistance | | **Iron (Fe)** | ≥39.5 | Base element | | **Carbon (C)** | 0.06–0.10 | Enhanced carbide strengthening for creep resistance | | **Aluminum (Al)** | 0.25–0.60 | Forms stable protective oxide scale | | **Titanium (Ti)** | 0.25–0.60 | Stabilization and precipitation strengthening | | **Manganese (Mn)** | ≤1.50 | Improves hot workability | | **Silicon (Si)** | ≤1.00 | Enhances oxidation/carburization resistance | | **Sulfur (S)** | ≤0.015 | Minimized to avoid hot shortness | | **Copper (Cu)** | ≤0.75 | — | *Critical Requirement: Aluminum + Titanium ≥ 1.20% for UNS N08811* --- ### **3.0 Physical Properties** | Property | Metric Value | Imperial Value | Condition | |----------|--------------|----------------|-----------| | **Density** | 8.03 g/cm³ | 0.29 lb/in³ | RT | | **Melting Range** | 1354–1384°C | 2470–2520°F | — | | **Specific Heat** | 460 J/kg·K | 0.11 Btu/lb·°F | 21°C | | **Thermal Conductivity** | 15.6 W/m·K | 9.0 Btu·in/hr·ft²·°F | 21°C | | **Thermal Expansion** | 16.6 × 10⁻⁶ /K | 9.2 × 10⁻⁶ /°F | 20–650°C | | **Electrical Resistivity** | 116 μΩ·cm | 45.8 μΩ·in | 21°C | | **Modulus of Elasticity** | 201 GPa | 29.1 × 10⁶ psi | RT | | **Magnetic Permeability** | <1.05 | <1.05 | Essentially non-magnetic | --- ### **4.0 Mechanical Properties** **Room-Temperature Properties (Solution-Annealed Condition)** - **Tensile Strength:** 450 MPa minimum (65 ksi minimum) - **Yield Strength (0.2% Offset):** 170 MPa minimum (25 ksi minimum) - **Elongation:** 30% minimum (in 2 inches) - **Hardness:** 70–90 HRB **Elevated Temperature Performance** - **Maximum Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior stress rupture properties at 650–815°C - **Oxidation Resistance:** Excellent performance in cyclic thermal conditions --- ### **5.0 International Standards** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS** | N08811 | Unified Numbering System | | **ASTM** | B409 | Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip | | **ASME** | SB-409 | Boiler and Pressure Vessel Code | | **EN/DIN** | 1.4959 | X8NiCrAlTi32-21 (Enhanced) | | **ISO** | 6207 | Nickel alloy wrought products | | **PED** | 2014/68/EU | Pressure Equipment Directive | --- ### **6.0 Product Specifications** **Available Sizes & Dimensions** - **Thickness Range:** 5 mm to 150 mm (0.1875" to 6") - **Standard Widths:** 1000 mm, 1250 mm, 1500 mm, 2000 mm (39", 49", 59", 79") - **Standard Lengths:** 2000 mm, 2500 mm, 3000 mm, 6000 mm (79", 98", 118", 236") - **Custom Sizes:** Available upon request **Tolerances** - **Thickness:** ±5% standard, ±3% precision available - **Width/Length:** ±5 mm standard - **Flatness:** 5 mm per meter maximum - **Straightness:** 3 mm per meter maximum --- ### **7.0 Applications** **Petrochemical Industry** - Steam methane reformer components - Ethylene cracking furnace parts - High-temperature reactor vessels - Reform outlet manifolds and headers **Power Generation** - Heat exchanger plates and headers - Boiler components and supports - Nuclear power plant fixtures - Combustion chamber liners **Industrial Processing** - Heat treatment furnace components - Retorts and muffles - Radiant tubes and supports - Process vessel fabrication **Aerospace & Defense** - Combustion chamber components - Afterburner parts - Rocket motor components - High-temperature structural members --- ### **8.0 Fabrication Characteristics** **Machining** - **Machinability Rating:** 25% (compared to 100% for B1112 steel) - **Recommended Tools:** Carbide tools with positive rake angles - **Cutting Parameters:** Moderate speeds with heavy, continuous feeds - **Coolants:** Sulfur-chlorinated oils recommended **Welding** - **Recommended Processes:** GTAW, GMAW, SMAW - **Filler Metal:** ERNiCrFe-8 for matching properties - **Preheat:** Not required for thickness < 25 mm - **Post-Weld Heat Treatment:** Solution anneal at 1120–1170°C **Forming** - **Cold Forming:** Good formability in annealed condition - **Hot Forming:** 1150–1200°C (2100–2190°F) - **Minimum Bend Radius:** 3× thickness for 90° bends --- ### **9.0 Quality Assurance** **Testing & Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis for each melt heat - Mechanical testing per heat treatment lot - Ultrasonic testing per ASTM A435/A577 **Heat Treatment** - **Solution Annealing:** 1120–1170°C (2050–2140°F) - **Quenching:** Rapid air or water cooling - **Certification:** Full heat treatment records provided --- ### **10.0 Advantages** - **Enhanced Creep Resistance:** Superior to standard 800H at high temperatures - **Excellent Oxidation Resistance:** Aluminum content provides protective scale formation - **Microstructural Stability:** Resists sigma phase formation and embrittlement - **Code Compliance:** Meets ASME, ASTM, and PED standards - **Proven Performance:** Long service life in critical applications --- ### **11.0 Storage & Handling** - Store in clean, dry conditions to prevent contamination - Protect from mechanical damage and corrosion - Maintain proper identification and heat number traceability - Use appropriate lifting equipment for heavy plates --- **Contact Information** For technical specifications, pricing, or custom plate requirements, please contact our technical sales team.

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 1915 gallon liquid totes Special package is available on request.