Alloy 800HT (Welding),Incoloy 800HT Sheet,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 Sheet (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Welding Sheet** (commercially known as **Incoloy 800HT Welding Sheet**, UNS **N08811**) is a high-performance nickel-iron-chromium superalloy sheet product specifically engineered for high-temperature welding applications requiring exceptional formability and superior high-temperature properties. With enhanced chemistry featuring controlled carbon content (0.06–0.10%) and elevated aluminum+titanium (Al + Ti ≥ 1.20%), this welding sheet delivers exceptional creep rupture strength and oxidation resistance at temperatures up to 815°C (1500°F). The sheet form is ideal for fabricating complex welded components in aggressive thermal environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B409/ASME SB-409) | Role in Welding Applications | |---------|----------------------------------|-----------------------------| | **Nickel (Ni)** | 30.0–35.0 | Austenitic matrix stability, prevents hot cracking during welding | | **Chromium (Cr)** | 19.0–23.0 | High-temperature oxidation resistance in weld HAZ | | **Iron (Fe)** | ≥39.5 | Base element, provides structural integrity | | **Carbon (C)** | 0.06–0.10 | Enhanced carbide strengthening for creep resistance in welded joints | | **Aluminum (Al)** | 0.25–0.60 | Forms stable protective oxide scale, reduces weld oxidation | | **Titanium (Ti)** | 0.25–0.60 | Stabilization, prevents sensitization in weld HAZ | | **Manganese (Mn)** | ≤1.50 | Improves hot workability, aids in sulfur control during welding | | **Silicon (Si)** | ≤1.00 | Enhances oxidation resistance, improves weld pool fluidity | | **Sulfur (S)** | ≤0.015 | Minimized to prevent hot cracking during welding | | **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:** 450–620 MPa (65–90 ksi) - **Yield Strength (0.2% Offset):** 170–380 MPa (25–55 ksi) - **Elongation:** 30–45% (in 2 inches) - **Hardness:** 70–90 HRB - **Impact Toughness:** 90 J min (Charpy V-notch at 21°C) **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** | B409 | Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip | | **ASME** | SB-409 | Boiler and Pressure Vessel Code | | **AWS** | A5.14 | ERNiCrFe-8 (Bare Welding Electrodes) | | **AWS** | D1.1 | Structural Welding Code - Steel | | **EN/DIN** | 1.4959 | X8NiCrAlTi32-21 | | **ISO** | 15614 | Specification and qualification of welding procedures | --- ### **6.0 Product Specifications** **Available Sizes & Dimensions** - **Thickness Range:** 0.5 mm to 6.0 mm (0.020" to 0.250") - **Standard Widths:** 600 mm, 1000 mm, 1219 mm, 1500 mm (24", 39", 48", 59") - **Standard Lengths:** 2000 mm, 2438 mm, 3000 mm (79", 96", 118") - **Custom Sizes:** Available for specific welding applications **Welding-Specific Tolerances** - **Thickness:** ±5% standard, ±3% for precision welding applications - **Flatness:** 2 mm per meter maximum for optimal fit-up - **Surface Condition:** 2B finish standard, pickled for welding readiness - **Edge Condition:** Mill edge, sheared, or machined for welding --- ### **7.0 Welding Applications** **Thermal Processing Equipment** - Heat treatment furnace linings and welded assemblies - Radiant heat shield fabrication - Muffle furnace component welding - Annealing cover and fixture construction **Aerospace & Defense Welding** - Combustion chamber liner fabrication - Afterburner component assembly - Thermal protection system welding - Exhaust system component fabrication **Power Generation Welding** - Heat exchanger surface panel assembly - Turbine shroud segment welding - Combustion liner part fabrication - High-temperature gasket and seal welding --- ### **8.0 Welding Characteristics & Procedures** **Recommended Welding Processes** - **GTAW (Gas Tungsten Arc Welding):** Primary process for thin sheets - **GMAW (Gas Metal Arc Welding):** For higher deposition rates - **Laser Welding:** For precision thin-section welding - **Plasma Arc Welding:** For automated applications **Welding Parameters for Thin Sheet** | Sheet Thickness (mm) | Welding Current (A) | Electrode Diameter (mm) | Filler Size (mm) | |---------------------|---------------------|------------------------|------------------| | 0.5–1.0 | 40–80 | 1.6 | 1.0–1.6 | | 1.0–2.0 | 60–120 | 2.4 | 1.6–2.4 | | 2.0–4.0 | 100–180 | 2.4–3.2 | 2.4–3.2 | **Joint Designs for Sheet Welding** - **Butt Joints:** Square groove, single V, double V - **Lap Joints:** Fillet welds, plug welds - **Edge Joints:** Flange welds, edge welds - **Corner Joints:** Open corner, closed corner --- ### **9.0 Quality Assurance for Welding** **Material Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis certification - Mechanical properties verification - Surface quality inspection report **Welding Procedure Qualification** - **PQR Requirements:** Per ASME Section IX or ISO 15614 - **WPS Development:** Custom procedures available - **NDT Methods:** PT, RT, UT as required by application - **Visual Standards:** Per AWS D1.1 acceptance criteria **Post-Weld Heat Treatment** - **Stress Relieving:** 870–900°C (1600–1650°F) optional - **Solution Annealing:** 1120–1170°C (2050–2140°F) recommended - **Atmosphere Control:** Bright annealing available - **Documentation:** Complete thermal cycle records --- ### **10.0 Advantages for Welding Applications** - **Excellent Weldability:** Superior welding characteristics in thin sections - **Minimal Distortion:** Low thermal expansion reduces welding distortion - **Stable HAZ:** Resists sensitization and maintains corrosion resistance - **Formable:** Can be pre-formed and then welded with excellent results - **Code Compliance:** Meets ASME, AWS, and international welding standards --- ### **11.0 Storage & Handling** - Store in clean, dry conditions to prevent contamination - Protect surface finish during handling and storage - Maintain proper identification and heat number traceability - Stack properly with protective interleaving to prevent damage --- **Contact Information** For welding procedure specifications, technical support, or sheet 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 1929 gallon liquid totes Special package is available on request.