Alloy 800HT (Welding),Incoloy 800HT ,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 Products (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Welding Products** (commercially known as **Incoloy 800HT Welding Products**, UNS **N08811**) comprise a comprehensive range of welding consumables specifically engineered for joining and repairing Alloy 800HT components in high-temperature service. With optimized chemistry matching the base metal requirements (0.06–0.10% C, Al + Ti ≥ 1.20%), these welding products deliver superior creep rupture strength, oxidation resistance, and microstructural stability at temperatures up to 815°C (1500°F). The product line includes covered electrodes, bare wires, and flux-cored wires for various welding processes. --- ### **2.0 Chemical Composition (wt%)** | Element | ERNiCrFe-8 (AWS A5.14) | ENiCrFe-8 (AWS A5.11) | Role in Weld Metal | |---------|--------------------------|------------------------|---------------------| | **Nickel (Ni)** | ≥62.0 | ≥62.0 | Austenitic matrix, corrosion resistance | | **Chromium (Cr)** | 28.0–32.0 | 28.0–32.0 | Oxidation and sulfidation resistance | | **Iron (Fe)** | 7.0–11.0 | 7.0–11.0 | Balance element | | **Carbon (C)** | 0.08–0.12 | 0.08–0.12 | Creep strength enhancement | | **Manganese (Mn)** | 2.5–3.5 | 2.5–3.5 | Deoxidation, sulfur control | | **Silicon (Si)** | 0.10–0.50 | 0.10–0.50 | Deoxidation, fluidity | | **Aluminum (Al)** | 0.10–0.30 | 0.10–0.30 | Deoxidation, oxidation resistance | | **Titanium (Ti)** | 0.10–0.30 | 0.10–0.30 | Stabilization, strength | | **Niobium (Nb)** | 0.50–1.0 | 0.50–1.0 | Hot cracking resistance | | **Phosphorus (P)** | ≤0.015 | ≤0.015 | Impurity control | | **Sulfur (S)** | ≤0.015 | ≤0.015 | Impurity control | --- ### **3.0 Physical Properties** | Property | Weld Metal Value | Condition | |----------|------------------|-----------| | **Density** | 8.0 g/cm³ | RT | | **Melting Range** | 1370–1400°C | — | | **Thermal Expansion** | 16.8 × 10⁻⁶ /K | 20–650°C | | **Thermal Conductivity** | 14.5 W/m·K | 21°C | | **Electrical Resistivity** | 120 μΩ·cm | 21°C | | **Modulus of Elasticity** | 195 GPa | RT | | **Magnetic Permeability** | <1.05 | Essentially non-magnetic | --- ### **4.0 Mechanical Properties** **As-Welded Condition (Typical)** - **Tensile Strength:** 550–650 MPa (80–94 ksi) - **Yield Strength (0.2% Offset):** 300–400 MPa (44–58 ksi) - **Elongation:** 30–40% (in 4D) - **Impact Toughness:** 80–120 J (Charpy V-notch, 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% - **Reduction of Area:** 40–50% **High-Temperature Weld Properties** - **Creep Strength:** Matches base metal performance - **Stress Rupture:** Excellent at 650–815°C - **Oxidation Resistance:** Comparable to Alloy 800HT base metal --- ### **5.0 International Standards** | Standard Type | Standard Number | Product Form | |--------------|----------------|--------------| | **AWS** | A5.14 | ERNiCrFe-8 (Bare Wire) | | **AWS** | A5.11 | ENiCrFe-8 (Covered 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 Forms & Specifications** **Bare Welding Wires (ERNiCrFe-8)** - **Diameter Range:** 0.8–4.0 mm (0.030–0.156") - **Spool Sizes:** 5 lb, 10 lb, 25 lb, 50 lb - **Surface Finish:** Bright, copper-coated, or special - **Packaging:** Vacuum-sealed with desiccant **Covered Electrodes (ENiCrFe-8)** - **Diameter Range:** 2.0–6.0 mm (0.080–0.250") - **Length:** 350 mm, 450 mm standard - **Coating Type:** Lime-based (basic) - **Packaging:** Hermetic containers **Flux-Cored Wires** - **Diameter Range:** 1.2–2.4 mm (0.045–0.094") - **Shielding Gas:** 75% Ar / 25% CO₂ or 100% CO₂ - **Position Capability:** All-position available --- ### **7.0 Welding Applications** **Base Metal Combinations** - Alloy 800HT to Alloy 800HT joints - Alloy 800HT to carbon steel dissimilar joints - Alloy 800HT to stainless steel transitions - Repair of existing Alloy 800HT components **Industry Applications** - **Petrochemical:** Reformer furnaces, cracking coils - **Power Generation:** Boiler components, heat exchangers - **Chemical Processing:** Reactors, process vessels - **Nuclear:** Core components, heat exchangers **Specific Joint Types** - Butt joints in pressure vessels - Nozzle-to-shell connections - Pipe and tube welds - Repair and overlay applications --- ### **8.0 Welding Characteristics** **Arc Characteristics** - **Arc Stability:** Excellent with all processes - **Slag Detachability:** Easy removal (covered electrodes) - **Spatter Level:** Low with proper parameters - **Bead Appearance:** Smooth and uniform **Operating Parameters** | Process | Current Type | Polarity | Gas/Flux | |---------|--------------|----------|----------| | **GTAW** | DC | Electrode Negative | Argon/Helium | | **GMAW** | DC | Electrode Positive | 75% Ar/25% CO₂ | | **SMAW** | DC | Electrode Positive | Basic flux | | **SAW** | DC | Electrode Positive | Neutral flux | **Typical Welding Parameters** - **GTAW:** 80–180 A, 10–15 V, Argon shielding - **GMAW:** 150–300 A, 24–30 V, 75% Ar/25% CO₂ - **SMAW:** 90–160 A, 22–28 V, DC+ --- ### **9.0 Welding Procedure Requirements** **Pre-Weld Preparation** - **Joint Design:** Standard V, U, or J grooves - **Cleaning:** Remove all contaminants - **Preheat:** Not required for thickness < 25 mm - **Interpass Temperature:** 150°C maximum **Post-Weld Treatment** - **Stress Relieving:** 870–900°C (optional) - **Solution Annealing:** 1120–1170°C (recommended) - **Cooling Rate:** Air cool or faster **Quality Control** - **Visual Inspection:** Per AWS D1.1 - **Radiographic Testing:** Per ASME Section V - **Liquid Penetrant:** For surface defects - **Hardness Testing:** Verify heat treatment --- ### **10.0 Weld Metal Properties** **Corrosion Resistance** - **Oxidation Resistance:** Excellent to 1150°C - **Carburization Resistance:** Good in hydrocarbon service - **Sulfidation Resistance:** Moderate in sulfur environments - **Chloride Stress Corrosion:** Excellent resistance **Metallurgical Properties** - **Microstructure:** Fully austenitic - **Grain Size:** ASTM 3–6 typical - **Sigma Phase:** Resistant with proper heat treatment - **Ductility Dip Cracking:** Low susceptibility --- ### **11.0 Quality Assurance** **Certification & Testing** - **Mill Certificates:** AWS A5.14/A5.11 compliant - **Chemical Analysis:** Per heat/lot - **Mechanical Testing:** Tensile, bend, impact - **Radiographic Standards:** Acceptable to ASME Section VIII **Storage & Handling** - **Storage Conditions:** Dry, temperature-controlled - **Electrode Baking:** 300–350°C for 1–2 hours - **Atmosphere Control:** Low humidity environment - **Shelf Life:** 12 months in original packaging --- ### **12.0 Advantages** - **Matched Properties:** Optimized for Alloy 800HT base metal - **Excellent Weldability:** Smooth operation with all processes - **High-Temperature Performance:** Maintains properties to 815°C - **Code Compliance:** Meets ASME, AWS, and ISO standards - **Proven Reliability:** Extensive service history in critical applications --- **Contact Information** For welding procedure specifications, technical support, 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 1923 gallon liquid totes Special package is available on request.