Alloy 800HT,Incoloy 800HT Rod,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 Rod (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Rod** (commercially known as **Incoloy 800HT Rod**, UNS **N08811**) is a premium nickel-iron-chromium superalloy rod product specifically engineered for extreme temperature applications. As an enhanced version of Alloy 800H, it features严格控制铝钛含量 (Al + Ti ≥ 1.20%) and optimized carbon content (0.06–0.10%), delivering superior creep rupture strength and microstructural stability at temperatures up to 815°C (1500°F). This rod form is ideal for machining high-stress components in aggressive thermal environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B408/ASME SB-408) | Role | |---------|----------------------------------|------| | Ni | 30.0–35.0 | Austenitic matrix stability, oxidation/carburization resistance | | Cr | 19.0–23.0 | High-temperature oxidation and sulfidation resistance | | Fe | ≥39.5 | Base element | | C | 0.06–0.10 | Enhanced carbide strengthening for creep resistance | | Al | 0.25–0.60 | Forms stable protective oxide scale | | Ti | 0.25–0.60 | Stabilization and precipitation strengthening | | Mn | ≤1.50 | Improves hot workability | | Si | ≤1.00 | Enhances oxidation/carburization resistance | | S | ≤0.015 | Minimized to avoid hot shortness | | Cu | ≤0.75 | — | *Critical Requirement: Aluminum + Titanium ≥ 1.20% for UNS N08811* --- ### **3.0 Physical Properties** | Property | 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 (70°F) | | Thermal Conductivity | 15.6 W/m·K (9.0 Btu·in/hr·ft²·°F) | 21°C (70°F) | | Thermal Expansion | 16.6 × 10⁻⁶ /K | 20–650°C | | Electrical Resistivity | 116 μΩ·cm (45.8 μΩ·in) | 21°C (70°F) | | Modulus of Elasticity | 201 GPa (29.1 × 10⁶ psi) | RT | | Magnetic Permeability | <1.05 | Essentially non-magnetic | --- ### **4.0 Mechanical Properties** **Room-Temperature Properties (Solution-Annealed Condition)** - **Tensile Strength:** 450 MPa min (65 ksi min) - **Yield Strength (0.2% Offset):** 170 MPa min (25 ksi min) - **Elongation:** 30% min (in 4D) - **Reduction of Area:** 30% min - **Hardness:** 70–90 HRB **Elevated Temperature Performance** - **Max Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior to Alloy 800H under sustained loads - **Stress Rupture Life:** 100,000 hours at 815°C under specific stress conditions --- ### **5.0 International Standards** | Standard Type | Number | Description | |--------------|--------|-------------| | UNS | N08811 | Unified Numbering System | | ASTM | B408 | Nickel-Iron-Chromium Alloy Rod and Bar | | ASME | SB-408 | Boiler and Pressure Vessel Code | | EN/DIN | 1.4959 | X8NiCrAlTi32-21 (Enhanced) | | ISO | 6207 | Nickel alloy wrought products | | NACE | MR0175 | Suitable for sour service environments | --- ### **6.0 Product Specifications** **Available Forms** - **Round Rod:** Diameter 5–300 mm (0.2–12 inches) - **Hexagonal Bar:** Across flats 10–100 mm - **Square Bar:** 10–100 mm sides - **Custom Shapes:** Forging stock and machine blanks **Surface Condition** - Hot finished, annealed, and descaled - Cold finished, turned, and polished - Centerless ground for precision applications --- ### **7.0 Applications** **Petrochemical Industry** - Steam methane reformer components - Ethylene cracking furnace parts - High-temperature valve stems and trim - Reactor internals and support rods **Power Generation** - Nuclear fuel assembly components - Gas turbine engine parts - Heat exchanger support rods - High-temperature fasteners and studs **Industrial Processing** - Heat treatment fixture components - Furnace radiant tube supports - Catalytic converter parts - High-temperature bolt and screw stock **Aerospace & Defense** - Jet engine components - Rocket motor parts - High-temperature structural members --- ### **8.0 Fabrication Characteristics** **Machining** - Machinability Rating: 25% (compared to 100% for B1112 steel) - Recommended Tools: Carbide or high-speed steel with positive rake angles - Cutting Fluids: Heavy-duty soluble oils required - Speeds/Feeds: Moderate speeds with continuous feeds **Welding** - **Processes:** GTAW, GMAW, SMAW - **Filler Metal:** ERNiCrFe-8 for matching composition - **Preheat:** Not required - **Post-Weld Heat Treatment:** Solution anneal at 1120–1170°C (2050–2140°F) **Heat Treatment** - **Solution Annealing:** 1120–1170°C (2050–2140°F) + rapid cool - **Stress Relieving:** 870–900°C (1600–1650°F) - **Aging:** Not required or recommended --- ### **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 available for critical applications **Dimensional Tolerances** - **Hot Finished:** ±1.5% of diameter or ±1.6 mm, whichever is greater - **Cold Finished:** ±0.1 mm for diameters up to 25 mm - **Straightness:** 1.5 mm per meter maximum --- ### **10.0 Advantages over Standard Alloy 800H Rod** - **Enhanced Creep Resistance:** Superior stress rupture properties at 650–815°C - **Improved Microstructural Stability:** Higher Al+Ti content prevents embrittlement - **Better Oxidation Resistance:** Extended service life in cyclic thermal environments - **Certified Performance:** Fully compliant with nuclear and pressure vessel codes --- ### **11.0 Storage & Handling** - Store in clean, dry conditions - Protect from contamination and mechanical damage - Use proper lifting equipment for heavy sections - Maintain identification and heat number traceability --- **Contact Information** For technical specifications, pricing, or custom rod 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 1911 gallon liquid totes Special package is available on request.