Alloy 800HT (Welding),Incoloy 800HT Bar(Round bar, Flat bar),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 Bar (Round & Flat Bar) (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Welding Bar** (commercially known as **Incoloy 800HT Welding Bar**, UNS **N08811**) is a specialized welding consumable in bar form, specifically engineered for high-temperature applications requiring exceptional creep resistance and oxidation stability. With optimized chemistry matching the base metal requirements (0.06–0.10% C, Al + Ti ≥ 1.20%), this welding bar delivers superior performance in joining and repair applications at temperatures up to 815°C (1500°F). Available in both round and flat bar configurations for various welding and repair scenarios. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (AWS A5.14/AWS A5.11) | Role in Weld Metal | |---------|----------------------------------|---------------------| | **Nickel (Ni)** | ≥62.0 | Austenitic matrix formation, corrosion resistance | | **Chromium (Cr)** | 28.0–32.0 | High-temperature oxidation and sulfidation resistance | | **Iron (Fe)** | 7.0–11.0 | Balance element | | **Carbon (C)** | 0.08–0.12 | Enhanced carbide strengthening for creep resistance | | **Manganese (Mn)** | 2.5–3.5 | Deoxidation, sulfur control | | **Silicon (Si)** | 0.10–0.50 | Wetting characteristics, fluidity | | **Aluminum (Al)** | 0.10–0.30 | Deoxidation, oxidation resistance | | **Titanium (Ti)** | 0.10–0.30 | Stabilization, precipitation strengthening | | **Niobium (Nb)** | 0.50–1.0 | Hot cracking resistance | | **Phosphorus (P)** | ≤0.015 | Impurity control | | **Sulfur (S)** | ≤0.015 | Impurity control | --- ### **3.0 Physical Properties** | Property | Metric Value | Imperial Value | Condition | |----------|--------------|----------------|-----------| | **Density** | 8.0 g/cm³ | 0.289 lb/in³ | RT | | **Melting Point** | 1375°C | 2507°F | — | | **Thermal Expansion** | 16.8 × 10⁻⁶ /K | 9.3 × 10⁻⁶ /°F | 20–650°C | | **Thermal Conductivity** | 14.5 W/m·K | 8.4 Btu·in/hr·ft²·°F | 21°C | | **Electrical Resistivity** | 120 μΩ·cm | 47.2 μΩ·in | 21°C | | **Modulus of Elasticity** | 195 GPa | 28.3 × 10⁶ psi | RT | | **Magnetic Permeability** | <1.05 | <1.05 | Essentially non-magnetic | --- ### **4.0 Mechanical Properties** **As-Deposited Weld Metal Properties** - **Tensile Strength:** 550–650 MPa (80–94 ksi) - **Yield Strength (0.2% Offset):** 300–400 MPa (44–58 ksi) - **Elongation:** 30–40% (in 4D) - **Reduction of Area:** 40–50% - **Hardness:** 75–95 HRB - **Impact Toughness:** 80–120 J (Charpy V-notch at 21°C) **Post-Weld Heat Treated Condition** - **Tensile Strength:** 500–600 MPa (73–87 ksi) - **Yield Strength:** 250–350 MPa (36–51 ksi) - **Elongation:** 35–45% - **Impact Toughness:** 100–140 J **High-Temperature Weld Properties** - **Creep Strength:** Matches Alloy 800HT base metal performance - **Stress Rupture Life:** Excellent at 650–815°C - **Oxidation Resistance:** Comparable to base metal up to 1150°C --- ### **5.0 International Standards** | Standard Type | Standard Number | Description | |--------------|----------------|-------------| | **UNS** | N08811 | Unified Numbering System | | **AWS** | A5.14 | ERNiCrFe-8 (Bare Welding Electrodes) | | **AWS** | A5.11 | ENiCrFe-8 (Covered Welding Electrodes) | | **ASME** | SFA-5.14 | ERNiCrFe-8 (BPVC Section II) | | **ASME** | SFA-5.11 | ENiCrFe-8 (BPVC Section II) | | **ISO** | 18274 | NiCr29Fe8 (Solid Wire) | | **EN** | 1600 | Ni 6082 (Covered Electrodes) | --- ### **6.0 Product Specifications** **Round Welding Bar** - **Diameter Range:** 3.0–12.0 mm (0.125–0.500") - **Length:** 1000 mm standard (custom lengths available) - **Tolerances:** ±0.1 mm for diameters up to 6.0 mm - **Surface Finish:** Bright, cleaned, or special coating **Flat Welding Bar** - **Thickness:** 3.0–10.0 mm (0.125–0.400") - **Width:** 10.0–50.0 mm (0.400–2.000") - **Length:** 500–1000 mm standard - **Edges:** Square, rounded, or custom **Available Forms** - **Straight Lengths:** Individual bars, bundled - **Cut Pieces:** Custom sizes for specific applications - **Special Shapes:** Machined to customer requirements --- ### **7.0 Applications** **Welding & Joining Applications** - GTAW (TIG) welding of Alloy 800HT components - Repair and buildup of high-temperature equipment - Cladding of carbon steel components for service up to 815°C - Dissimilar metal joining between nickel alloys and steels **Industry Specific Applications** - **Petrochemical:** Reformer furnace components, cracking coils - **Power Generation:** Boiler tubes, heat exchanger repairs - **Chemical Processing:** Reactor vessels, distillation columns - **Nuclear:** Core components, heat exchanger tubing - **Aerospace:** Combustion chamber repairs, turbine components **Specific Use Cases** - Manual GTAW root passes in pipe welding - Repair of cracked or eroded components - Buildup of worn surfaces in high-temperature service - Fabrication of transition joints between dissimilar materials --- ### **8.0 Welding Characteristics** **GTAW (TIG) Welding Performance** - **Arc Stability:** Excellent with DCEN polarity - **Fluidity:** Good puddle control and wetting characteristics - **Slag Formation:** Minimal in bare rod form - **Spatter:** Negligible with proper technique **Operating Parameters** | Bar Diameter (mm) | Current Range (A) | Gas Flow (l/min) | |-------------------|------------------|------------------| | 2.4 | 60–100 | 8–12 | | 3.2 | 80–130 | 10–14 | | 4.0 | 100–160 | 12–16 | **Shielding Gas Requirements** - **Primary Gas:** Argon (99.995% purity) - **Alternative Mixtures:** Argon-Helium blends - **Backing Gas:** Argon for critical applications - **Gas Flow Rates:** 10–15 l/min depending on application --- ### **9.0 Quality Assurance** **Testing & Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis for each heat/lot - Mechanical testing per manufacturing lot - Certification to AWS A5.14/A5.11 requirements **Visual & Dimensional Standards** - **Surface Quality:** Free from defects and contamination - **Diameter/Thickness:** Within specified tolerances - **Straightness:** 1 mm per 300 mm maximum - **Identification:** Clear marking with alloy designation **Welding Procedure Qualification** - Qualified to ASME Section IX requirements - PQR and WPS documentation available - NDT compliance (RT, PT, UT) - Welder performance qualification support --- ### **10.0 Storage & Handling** **Storage Conditions** - Dry, temperature-controlled environment - Relative humidity below 50% - Protected from contamination and mechanical damage - Original packaging until use **Preparation & Handling** - Clean with solvent before use if required - Handle with clean gloves to prevent contamination - Store separately from other alloy types - Maintain traceability to original certification --- ### **11.0 Advantages** - **Optimized Chemistry:** Precisely matched to Alloy 800HT base metal requirements - **Superior High-Temperature Performance:** Excellent creep and oxidation resistance - **Versatile Application:** Suitable for multiple welding processes and positions - **Code Compliance:** Meets ASME, AWS, and international standards - **Proven Reliability:** Extensive successful use in critical high-temperature applications --- **Contact Information** For technical specifications, welding procedure development, or product ordering, please contact our welding engineering department.

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 1925 gallon liquid totes Special package is available on request.