Alloy 800HT,Incoloy 800HT Forgings,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 Forgings (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Forgings** (commercially known as **Incoloy 800HT Forgings**, UNS **N08811**) represent the highest quality product form of this enhanced nickel-iron-chromium superalloy, specifically engineered for critical high-temperature applications. Through controlled forging processes and optimized chemistry featuring elevated carbon (0.06–0.10%) and aluminum+titanium (Al + Ti ≥ 1.20%), these forgings deliver exceptional creep rupture strength, microstructural stability, and mechanical integrity at temperatures up to 815°C (1500°F). The forging process ensures superior grain structure and directional strength properties for the most demanding industrial applications. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B564/ASME SB-564) | 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)** - **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 - **Impact Strength:** 75 J min (Charpy V-notch at 21°C) **Elevated Temperature Performance** - **Maximum Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior stress rupture properties at 650–815°C - **Thermal Fatigue Resistance:** Excellent performance under cyclic conditions --- ### **5.0 International Standards** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS** | N08811 | Unified Numbering System | | **ASTM** | B564 | Nickel Alloy Forgings | | **ASME** | SB-564 | Boiler and Pressure Vessel Code | | **ASTM** | A788 | Standard Specification for Steel Forgings | | **EN** | 10204 | Metallic Products Inspection Documents | | **EN/DIN** | 1.4959 | X8NiCrAlTi32-21 | --- ### **6.0 Forging Processes & Capabilities** **Manufacturing Methods** - **Open Die Forgings:** Components up to 5000 kg - **Closed Die Forgings:** Complex shapes with minimal machining - **Ring Rolled Forgings:** Seamless rings up to 4000 mm diameter - **Press Forgings:** Controlled deformation for optimal grain flow **Forging Temperature Ranges** - **Heating Temperature:** 1150–1200°C (2100–2190°F) - **Forging Start Temperature:** 1100–1150°C (2010–2100°F) - **Forging Finish Temperature:** ≥950°C (1740°F) **Heat Treatment** - **Solution Annealing:** 1120–1170°C (2050–2140°F) - **Quenching Medium:** Water or rapid air cooling - **Stress Relieving:** For complex geometries and machined components --- ### **7.0 Applications** **Petrochemical Industry** - Steam methane reformer components - Ethylene cracking furnace parts - High-temperature reactors and vessels - Reform outlet manifolds and headers - Catalyst support grids and beams **Power Generation** - Turbine discs and shafts - Valve bodies and steam chests - Pump casings and impellers - Nuclear reactor components - Heat exchanger headers and tubesheets **Aerospace & Defense** - Jet engine components - Rocket motor parts - High-temperature fasteners - Afterburner components **Industrial Equipment** - High-temperature furnace fixtures - Heat treatment retorts and muffles - Industrial heating elements - Thermal processing hardware --- ### **8.0 Design Advantages of Forgings** **Superior Mechanical Properties** - Directional grain flow for optimized strength - Elimination of internal defects and porosity - Improved impact and fatigue resistance - Consistent properties throughout cross-section **Enhanced Reliability** - Homogeneous microstructure - Reduced inspection requirements - Predictable failure modes - Extended service life **Manufacturing Benefits** - Near-net shape capabilities - Reduced machining time and cost - Excellent surface integrity - Consistent batch-to-batch quality --- ### **9.0 Quality Assurance & Testing** **Non-Destructive Examination** - **Ultrasonic Testing (UT):** Per ASTM A388 - **Liquid Penetrant Testing (PT):** Per ASTM E165 - **Magnetic Particle Testing (MT):** Limited application - **Radiographic Testing (RT):** Per ASTM E94 for critical sections **Destructive Testing** - **Tensile Testing:** At room and elevated temperatures - **Impact Testing:** Charpy V-notch as required - **Hardness Testing:** Multiple locations - **Microstructural Examination:** Grain size, inclusion rating **Certification & Documentation** - **Material Test Reports:** Full traceability to melt heat - **Chemical Analysis:** Ladle and product verification - **Mechanical Test Reports:** Location-specific testing - **Heat Treatment Charts:** Time-temperature records --- ### **10.0 Technical Specifications** **Size Range Capabilities** - **Weight Range:** 1 kg to 5000 kg - **Maximum Dimensions:** 3000 mm length, 1500 mm diameter - **Ring Forgings:** Up to 4000 mm OD × 500 mm wall height **Surface Finish** - **As-Forged:** Scale present, rough surface - **Machined:** Various surface finishes available - **Special:** Pickled, ground, or polished as required **Dimensional Tolerances** - **Commercial Forgings:** ASTM A788 Standard - **Precision Forgings:** Customer-specific requirements - **Machining Allowances:** Optimized for cost-effectiveness --- ### **11.0 Advantages over Standard Alloy 800H Forgings** - **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 - **Superior Grain Structure:** Optimized forging process ensures directional strength - **Certified Performance:** Fully compliant with nuclear and pressure vessel codes --- ### **12.0 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 sections --- **Contact Information** For technical specifications, pricing, or custom forging 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 1919 gallon liquid totes Special package is available on request.