Alloy 800HT (Welding),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 Welding Pipe (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Welding Pipe** (commercially known as **Incoloy 800HT Welding Pipe**, UNS **N08811**) is a specialized piping product designed for high-temperature welding applications requiring exceptional creep resistance and oxidation stability. Manufactured with enhanced chemistry featuring controlled carbon content (0.06–0.10%) and elevated aluminum+titanium (Al + Ti ≥ 1.20%), this welding pipe delivers superior performance in high-temperature service up to 815°C (1500°F). The product is specifically engineered for welding applications in critical service environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B407/ASME SB-407) | Role | |---------|----------------------------------|------| | **Nickel (Ni)** | 30.0–35.0 | Austenitic matrix stability, oxidation 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 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** **Base Metal 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 2 inches) - **Hardness:** 70–90 HRB **Weld Metal Properties (with ERNiCrFe-8)** - **Tensile Strength:** 550–650 MPa (80–94 ksi) - **Yield Strength:** 300–400 MPa (44–58 ksi) - **Elongation:** 30–40% - **Impact Toughness:** 80–120 J (Charpy V-notch) --- ### **5.0 International Standards** | Standard Type | Standard 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 | | **AWS** | A5.14 | ERNiCrFe-8 (Welding Electrode Specification) | --- ### **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 **Welding End Preparation** - **Standard Bevel:** 37.5° with 1.6 mm land - **Special Bevels:** J-prep, U-prep, compound bevels - **Surface Finish:** 3.2 μm Ra internal, 6.3 μm Ra external - **End Protection:** Plastic caps for bevel protection --- ### **7.0 Welding Applications & Procedures** **Primary Welding Processes** - **GTAW (TIG):** Root passes and all-position welding - **SMAW (Stick):** Fill and cap passes - **GMAW (MIG):** Automatic and semi-automatic welding **Recommended Welding Materials** - **Filler Metal:** ERNiCrFe-8 (AWS A5.14) - **Covered Electrodes:** ENiCrFe-8 (AWS A5.11) - **Shielding Gas:** Argon or Argon-Helium mixtures - **Backing Gas:** Argon for root protection **Welding Parameters** | Process | Current (A) | Voltage (V) | Travel Speed (mm/min) | |---------|-------------|-------------|----------------------| | **GTAW** | 80–180 | 10–15 | 80–150 | | **SMAW** | 90–160 | 22–28 | 100–200 | | **GMAW** | 150–300 | 24–30 | 200–400 | --- ### **8.0 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 - Boiler tube and pipe systems **Welding-Specific Applications** - Pipe-to-pipe butt welds - Pipe-to-fitting connections - Nozzle-to-pipe welds - Repair and modification welding --- ### **9.0 Quality Assurance for Welding** **Material Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis for each melt heat - Mechanical testing per heat treatment lot - NDE reports (UT, RT, PT as specified) **Welding Procedure Qualification** - **PQR Qualification:** Per ASME Section IX - **WPS Availability:** Standard procedures available - **NDT Requirements:** RT, UT, PT per project specs - **Hardness Testing:** Post-weld verification **Dimensional Standards** - **OD & Wall Thickness:** per ASME B36.19 - **Bevel Dimensions:** per ASME B16.25 - **Straightness:** 1.5 mm per meter maximum - **Alignment:** Internal and external alignment tools --- ### **10.0 Advantages for Welding Applications** - **Optimized Weldability:** Superior welding characteristics compared to standard grades - **Enhanced Creep Resistance:** Superior stress rupture properties at 650–815°C - **Excellent Weld Metal Properties:** Matched filler metals available - **Code Compliance:** Meets ASME, ASTM, and nuclear standards - **Proven Performance:** Extensive successful use in critical welded applications --- ### **11.0 Storage & Handling for Welding** - Store in clean, dry conditions to prevent contamination - Protect welding bevels with plastic caps - Maintain proper identification and heat number traceability - Store separately from other materials to prevent cross-contamination --- **Contact Information** For welding procedure specifications, technical support, or pipe product requirements, please contact our technical sales and engineering 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 1926 gallon liquid totes Special package is available on request.