Alloy 800HT (Welding),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 Welding Fittings (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Welding Fittings** (commercially known as **Incoloy 800HT Welding Fittings**, UNS **N08811**) are precision-engineered piping components specifically 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%), these welding fittings deliver superior performance in high-temperature service up to 815°C (1500°F). The fittings are optimized for welding integrity in critical service environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B366/ASME SB-366) | Role in Welding Applications | |---------|----------------------------------|-----------------------------| | **Nickel (Ni)** | 30.0–35.0 | Austenitic matrix stability, prevents hot cracking | | **Chromium (Cr)** | 19.0–23.0 | High-temperature oxidation resistance in HAZ | | **Iron (Fe)** | ≥39.5 | Base element, provides structural integrity | | **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, prevents sensitization | | **Manganese (Mn)** | ≤1.50 | Improves hot workability, sulfur control | | **Silicon (Si)** | ≤1.00 | Enhances oxidation resistance, weld fluidity | | **Sulfur (S)** | ≤0.015 | Minimized to prevent hot cracking | | **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 Expansion** | 16.6 × 10⁻⁶ /K | 9.2 × 10⁻⁶ /°F | 20–650°C | | **Thermal Conductivity** | 15.6 W/m·K | 9.0 Btu·in/hr·ft²·°F | 21°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 - **Hardness:** 70–90 HRB - **Impact Toughness:** 75 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% --- ### **5.0 International Standards** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS** | N08811 | Unified Numbering System | | **ASTM** | B366 | Factory-Made Wrought Nickel Alloy Fittings | | **ASME** | SB-366 | Boiler and Pressure Vessel Code | | **ASME** | B16.9 | Steel Buttweld Fittings | | **ASME** | B16.11 | Socket-Weld and Threaded Fittings | | **AWS** | A5.14 | ERNiCrFe-8 (Welding Electrode Specification) | --- ### **6.0 Product Specifications** **Butt-Weld Fittings (ASME B16.9)** - **Elbows:** 45°, 90°, 180° (Long & Short Radius) - **Tees:** Straight & Reducing - **Reducers:** Concentric & Eccentric - **Caps:** Hemispherical & Elliptical **Socket-Weld Fittings (ASME B16.11)** - **Socket Elbows:** 45°, 90° - **Socket Tees:** Straight - **Socket Couplings:** Hex & Round - **Socket Caps:** End Closures **Special Welding Fittings** - **Forged Crosses** - **Lap Joint Stub Ends** - **Return Bends** - **Nozzle Connections** --- ### **7.0 Welding Applications & Procedures** **Welding Processes for Fittings** - **GTAW (TIG):** Root passes and critical welds - **SMAW (Stick):** Fill and cap passes - **GMAW (MIG):** Semi-automatic and automatic welding **Welding Preparation** - **Bevel Preparation:** 37.5° with 1.6 mm land - **Fit-up Tolerances:** Per ASME B31.3 - **Cleaning:** Remove contaminants before welding - **Alignment:** Proper internal and external alignment **Welding Parameters** | Fitting Size | Process | Current (A) | Voltage (V) | |-------------|---------|-------------|-------------| | ≤ 2" NPS | GTAW | 80–150 | 10–15 | | 2"–8" NPS | SMAW | 90–160 | 22–28 | | ≥ 8" NPS | GMAW | 150–300 | 24–30 | --- ### **8.0 Applications** **Petrochemical Welding Applications** - Reformer outlet header welding - Cracking furnace transfer line fittings - High-temperature pipe-to-fitting connections - Manifold and header assemblies **Power Generation Welding** - Boiler feedwater fitting welding - Steam pipe fitting connections - Heat exchanger nozzle welding - High-temperature valve connections **Special Welding Applications** - Dissimilar metal welding transitions - High-pressure fitting connections - Cyclic service welding applications - Critical service weld joints --- ### **9.0 Quality Assurance for Welding** **Material Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis for each heat - Mechanical testing certification - NDE reports (UT, PT, RT as specified) **Welding Procedure Qualification** - **PQR Qualification:** Per ASME Section IX - **WPS Availability:** Standard procedures - **Welder Qualification:** Performance testing - **NDT Requirements:** Per project specifications **Dimensional Standards** - **Bevel Dimensions:** Per ASME B16.25 - **Wall Thickness:** Per ASME B16.9 - **Alignment:** Internal and external requirements - **Surface Finish:** Suitable for welding --- ### **10.0 Advantages for Welding Applications** - **Optimized Weldability:** Superior welding characteristics - **Stable HAZ:** Resists sensitization and maintains properties - **Code Compliance:** Meets ASME, ASTM, and AWS standards - **Proven Performance:** Extensive successful welding history - **High-Temperature Integrity:** Maintains properties in welded condition --- ### **11.0 Storage & Handling** - Store in clean, dry conditions - Protect welding bevels from damage - Maintain proper identification - Use appropriate handling equipment --- **Contact Information** For welding procedure specifications, technical support, or fitting 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 1931 gallon liquid totes Special package is available on request.