Alloy 800HT,Incoloy 800HT Pipe,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 Pipe (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Pipe** (commercially known as **Incoloy 800HT Pipe**, UNS **N08811**) is a high-performance nickel-iron-chromium superalloy piping product 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%), this alloy provides exceptional creep rupture strength, oxidation resistance, and structural stability at temperatures up to 815°C (1500°F). These pipes are manufactured to meet the most demanding service conditions in petrochemical, power generation, and industrial processing applications. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B407/ASME SB-407) | 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 2 inches) - **Hardness:** 70–90 HRB **Elevated Temperature Performance** - **Max Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior stress rupture properties at 650–815°C - **Pressure Rating:** ASME B36.19 compliance for high-temperature service --- ### **5.0 International Standards** | Standard Type | Number | Description | |--------------|--------|-------------| | UNS | N08811 | Unified Numbering System | | ASTM | B407 | Nickel-Iron-Chromium Alloy Seamless Pipe and Tube | | ASTM | B829 | Nickel Alloy Seamless Pipe and Tube | | ASME | SB-407 | Boiler and Pressure Vessel Code | | ASME | B36.19 | Stainless Steel Pipe dimensions | | EN/DIN | 1.4959 | X8NiCrAlTi32-21 (Enhanced) | | NACE | MR0175 | Suitable for sour service environments | --- ### **6.0 Product Specifications** **Pipe Types Available** - **Seamless Pipe:** OD 6–500 mm (0.25–20 inches) - **Welded Pipe:** OD 50–1200 mm (2–48 inches) - **Schedule:** SCH 10S to SCH XXS - **Length:** Random 5–7 meters, Cut to length available **Size Ranges** - **Standard Sizes:** 1/8" to 24" NPS - **Wall Thickness:** SCH 5S to SCH 160 - **End Finishes:** Plain end, Beveled end, Threaded and coupled --- ### **7.0 Applications** **Petrochemical Industry** - Steam methane reformer outlet headers - Ethylene cracking furnace transfer lines - Hydrocarbon processing unit piping - Reformer and cracker outlet manifolds **Power Generation** - High-temperature steam piping systems - Heat recovery steam generator tubing - Nuclear power plant primary piping - Gas turbine exhaust systems **Industrial Processing** - Thermal fluid transfer systems - Heat treatment furnace piping - Process gas conveyance systems - High-temperature exhaust ducts **Chemical Processing** - Corrosive chemical transfer lines - High-temperature reaction systems - Heat exchanger piping connections - Process interconnecting piping --- ### **8.0 Fabrication Characteristics** **Welding & Joining** - **Recommended Processes:** GTAW, GMAW, SMAW - **Filler Metal:** ERNiCrFe-8 for matching properties - **Preheat:** Not normally required - **Post-Weld Heat Treatment:** Solution anneal at 1120–1170°C - **Joint Preparation:** Standard bevel designs per ASME Section IX **Forming & Bending** - **Cold Bending:** Minimum bend radius 3× OD - **Hot Bending:** 1150–1200°C for complex configurations - **Flaring/Flanging:** Good formability in annealed condition **Installation Considerations** - **Support Spacing:** Per ASME B31.3 for high-temperature service - **Expansion Compensation:** Account for thermal growth at elevated temperatures - **Gasket Selection:** High-temperature spiral wound or ring-type joints --- ### **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 - Hydrostatic testing per ASTM standards - Nondestructive examination as specified **Dimensional Standards** - **OD & Wall Thickness:** per ASME B36.19 - **Straightness:** 1.5 mm per meter maximum - **Bevel Dimensions:** per ASME B16.25 - **Surface Finish:** 3.2 μm Ra internal, 6.3 μm Ra external --- ### **10.0 Pressure-Temperature Ratings** **ASME B31.3 Compliance** - **Max Allowable Stress:** Temperature-dependent values per ASME Section II - **Pressure Design:** Wall thickness calculations per ASME B31.3 - **Corrosion Allowance:** Customizable based on service environment --- ### **11.0 Advantages** - **Superior Creep Resistance:** Enhanced stress rupture properties at 650–815°C - **Excellent Oxidation Resistance:** Aluminum content provides protective scale formation - **Microstructural Stability:** Resists sigma phase formation and embrittlement - **Code Compliance:** Meets ASME, ASTM, and nuclear standards - **Long Service Life:** Proven performance in critical high-temperature applications --- ### **12.0 Storage & Handling** - Store in clean, dry environment to prevent contamination - Protect ends from damage during handling and storage - Maintain proper identification and heat number traceability - Use appropriate lifting equipment to prevent mechanical damage --- **Contact Information** For technical specifications, pricing, or custom pipe 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 1913 gallon liquid totes Special package is available on request.