Alloy 800HT,Incoloy 800HT Fittings,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 Fittings (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Fittings** (commercially known as **Incoloy 800HT Fittings**, UNS **N08811**) are precision-engineered piping components manufactured from an enhanced nickel-iron-chromium superalloy specifically designed for extreme temperature and pressure applications. With optimized chemistry featuring controlled carbon content (0.06–0.10%) and elevated aluminum+titanium (Al + Ti ≥ 1.20%), these fittings deliver superior creep rupture strength, oxidation resistance, and microstructural stability at temperatures up to 815°C (1500°F). They are manufactured to maintain system integrity in the most demanding industrial environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B366/ASME SB-366) | 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 - **Hardness:** 70–90 HRB - **Impact Strength:** 100 J min (Charpy V-notch) **Elevated Temperature Performance** - **Maximum Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior to Alloy 800H under sustained loads - **Pressure Ratings:** ASME B16.9, B16.11, B16.28 compliant --- ### **5.0 International Standards** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS** | N08811 | Unified Numbering System | | **ASTM** | B366 | Factory-Made Wrought Nickel Alloy Fittings | | **ASTM** | B564 | Nickel Alloy Forgings | | **ASME** | SB-366 | Boiler and Pressure Vessel Code | | **ASME** | B16.9 | Steel Buttweld Fittings | | **ASME** | B16.11 | Socket-Weld and Threaded Fittings | | **EN/DIN** | 1.4959 | X8NiCrAlTi32-21 | --- ### **6.0 Product Range & Specifications** **Butt-Weld Fittings (ASME B16.9)** - **Elbows:** 45°, 90°, 180° (Long & Short Radius) - **Tees:** Straight & Reducing (Equal & Unequal) - **Reducers:** Concentric & Eccentric - **Caps:** Hemispherical & Elliptical - **Stub Ends:** MSS SP-43 **Socket-Weld Fittings (ASME B16.11)** - **Socket Elbows:** 45°, 90° - **Socket Tees:** Straight - **Socket Couplings:** Hex & Round - **Socket Caps:** End Closures **Threaded Fittings (ASME B16.11)** - **Threaded Elbows:** 45°, 90° - **Threaded Tees:** Straight - **Threaded Couplings:** Hex & Reducing - **Threaded Unions:** High-Temperature Service **Special Fittings** - **Forged Crosses** - **Lap Joint Stub Ends** - **Return Bends** - **Custom Fabrications** --- ### **7.0 Manufacturing Processes** **Forming Methods** - **Hot Forming:** 1150–1200°C (2100–2190°F) - **Cold Forming:** With intermediate annealing - **Forging:** Hammer, press, and ring rolling - **Machining:** From bar or forged stock **Heat Treatment** - **Solution Annealing:** 1120–1170°C (2050–2140°F) - **Quenching:** Water or rapid air cooling - **Stress Relieving:** For complex geometries **Quality Processes** - **NDT Testing:** PT, MT, RT, UT as required - **Dimensional Verification:** ASME/ANSI standards - **Pressure Testing:** Hydrostatic/pneumatic - **Surface Inspection:** Visual and enhanced examination --- ### **8.0 Applications** **Petrochemical Industry** - Steam methane reformer systems - Ethylene cracking furnace piping - Hydrocarbon processing units - Reformer outlet manifolds and headers **Power Generation** - High-temperature steam piping - Heat recovery steam generators - Boiler feedwater systems - Nuclear power plant components **Chemical Processing** - Corrosive chemical handling - High-temperature reaction systems - Heat exchanger connections - Process interconnecting piping **Industrial Heating** - Thermal fluid systems - Heat treatment furnace piping - Radiant tube connections - Combustion system components --- ### **9.0 Design & Selection Considerations** **Pressure-Temperature Ratings** - ASME B31.3 Process Piping compliant - Temperature-dependent derating factors - Creep consideration above 540°C (1000°F) **Corrosion Allowance** - Minimum wall thickness requirements - Erosion/corrosion considerations - Service life calculations **Installation Requirements** - Welding procedures and qualifications - Preheating and PWHT requirements - Alignment and fit-up tolerances - Support and expansion considerations --- ### **10.0 Quality Assurance** **Certification & Documentation** - Mill Test Certificate 3.1 per EN 10204 - Material Test Reports with heat number traceability - Chemical and mechanical properties certification - NDT reports and compliance certificates **Testing & Inspection** - Chemical analysis verification - Mechanical testing: tensile, hardness, impact - Non-destructive examination per project requirements - Dimensional inspection to applicable standards **Marking & Traceability** - Permanent marking per ASTM A961 - Heat number and material grade identification - Size, schedule, and pressure rating marking - Manufacturer's identification --- ### **11.0 Advantages** - **Enhanced High-Temperature Strength:** Superior creep and stress rupture properties - **Excellent Oxidation Resistance:** Optimal performance in aggressive environments - **Microstructural Stability:** Resists sigma phase formation and embrittlement - **Code Compliance:** Meets ASME, ASTM, and nuclear standards - **Proven Reliability:** Long-term performance in critical applications --- **Contact Information** For technical specifications, pricing, or custom fitting 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 1918 gallon liquid totes Special package is available on request.