Alloy 800HT,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 Bar (Round & Flat Bar) (UNS N08811)** --- ### **1.0 Product Overview** **Alloy 800HT Bar** (commercially known as **Incoloy 800HT Bar**, UNS **N08811**) is a high-performance nickel-iron-chromium superalloy available in round and flat bar forms, specifically engineered for extreme temperature applications. With controlled chemistry featuring elevated carbon (0.06–0.10%) and aluminum+titanium (Al + Ti ≥ 1.20%), this alloy delivers exceptional creep rupture strength, oxidation resistance, and structural stability at temperatures up to 815°C (1500°F). These bar products are ideal for machining, forging, and fabricating critical components in aggressive thermal environments. --- ### **2.0 Chemical Composition (wt%)** | Element | Content (ASTM B408/ASME SB-408) | Role | |---------|----------------------------------|------| | Ni | 30.0–35.0 | Austenitic matrix stability, oxidation/carburization resistance | | Cr | 19.0–23.0 | High-temperature oxidation and sulfidation resistance | | Fe | ≥39.5 | Base element | | C | 0.06–0.10 | Enhanced carbide strengthening for creep resistance | | Al | 0.25–0.60 | Forms stable protective oxide scale | | Ti | 0.25–0.60 | Stabilization and precipitation strengthening | | Mn | ≤1.50 | Improves hot workability | | Si | ≤1.00 | Enhances oxidation/carburization resistance | | S | ≤0.015 | Minimized to avoid hot shortness | | Cu | ≤0.75 | — | *Critical Requirement: Aluminum + Titanium ≥ 1.20% for UNS N08811* --- ### **3.0 Physical Properties** | Property | 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 (70°F) | | Thermal Conductivity | 15.6 W/m·K (9.0 Btu·in/hr·ft²·°F) | 21°C (70°F) | | Thermal Expansion | 16.6 × 10⁻⁶ /K | 20–650°C | | Electrical Resistivity | 116 μΩ·cm (45.8 μΩ·in) | 21°C (70°F) | | Modulus of Elasticity | 201 GPa (29.1 × 10⁶ psi) | RT | | Magnetic Permeability | <1.05 | Essentially non-magnetic | --- ### **4.0 Mechanical Properties** **Room-Temperature Properties (Solution-Annealed Condition)** - **Tensile Strength:** 450 MPa min (65 ksi min) - **Yield Strength (0.2% Offset):** 170 MPa min (25 ksi min) - **Elongation:** 30% min (in 4D) - **Reduction of Area:** 30% min - **Hardness:** 70–90 HRB **Elevated Temperature Performance** - **Max Service Temperature:** 815°C (1500°F) continuous - **Creep Strength:** Superior stress rupture properties at 650–815°C - **Oxidation Resistance:** Excellent performance in cyclic thermal conditions --- ### **5.0 International Standards** | Standard Type | Number | Description | |--------------|--------|-------------| | UNS | N08811 | Unified Numbering System | | ASTM | B408 | Nickel-Iron-Chromium Alloy Rod and Bar | | ASME | SB-408 | Boiler and Pressure Vessel Code | | EN/DIN | 1.4959 | X8NiCrAlTi32-21 (Enhanced) | | ISO | 6207 | Nickel alloy wrought products | | NACE | MR0175 | Suitable for sour service environments | --- ### **6.0 Product Specifications** **Round Bar** - **Diameter Range:** 5–300 mm (0.2–12 inches) - **Length:** 3–6 meters standard (custom lengths available) - **Tolerances:** Hot finished ±1.5%, Cold finished ±0.1 mm - **Surface:** Annealed and descaled, turned, or centerless ground **Flat Bar** - **Thickness:** 5–100 mm (0.2–4 inches) - **Width:** 20–300 mm (0.8–12 inches) - **Length:** 3–6 meters standard - **Tolerances:** Thickness ±0.5 mm, Width ±1.0 mm - **Edges:** Square, rounded, or beveled as required --- ### **7.0 Applications** **Round Bar Applications** - High-temperature valve stems and shafts - Pump shafts and rotors for thermal fluid systems - Nuclear reactor control rod drives - Turbine and compressor shafts - Heat treatment fixture components - Fastener stock for critical bolting applications **Flat Bar Applications** - Structural supports in high-temperature furnaces - Heat treatment baskets and rails - Furnace damper and valve linkages - Reaction chamber structural members - High-temperature heat exchanger supports - Machinery frames and bases in thermal processes --- ### **8.0 Fabrication Characteristics** **Machining** - **Machinability:** 25% compared to B1112 steel - **Tool Selection:** Carbide tools with positive rake angles - **Cutting Parameters:** Moderate speeds with heavy, continuous feeds - **Coolants:** Sulfur-chlorinated oils recommended for heavy cutting **Welding** - **Recommended Processes:** GTAW, GMAW - **Filler Metal:** ERNiCrFe-8 for matching properties - **Preheat:** Not normally required - **Post-Weld Heat Treatment:** Solution anneal at 1120–1170°C **Hot Working** - **Forging Temperature:** 1150–1200°C (2100–2190°F) - **Finishing Temperature:** ≥950°C (1740°F) - **Heating Rate:** Moderate to avoid thermal shock **Cold Working** - Good ductility in annealed condition - Intermediate annealing required for severe deformation - Stress relieve at 870–900°C after cold working --- ### **9.0 Quality Assurance** **Testing & Certification** - Mill Test Certificate 3.1 per EN 10204 - Chemical analysis for each melt heat - Mechanical testing per heat treatment lot - Ultrasonic testing available for critical applications **Dimensional Standards** - **Round Bar Tolerances:** per ASTM B408 - **Flat Bar Tolerances:** per ASTM B408 - **Straightness:** 1.5 mm per meter maximum - **Surface Finish:** 3.2 μm Ra standard, finer finishes available --- ### **10.0 Advantages** - **Superior High-Temperature Strength:** Enhanced creep and stress rupture properties - **Excellent Oxidation Resistance:** Aluminum content provides protective scale formation - **Microstructural Stability:** Resists sigma phase formation and embrittlement - **Versatile Manufacturing:** Suitable for machining, welding, and forming operations - **Code Compliance:** Meets ASME, ASTM, and nuclear standards --- ### **11.0 Storage & Handling** - Store in clean, dry environment to prevent contamination - Protect from mechanical damage and corrosion - Maintain proper identification and heat number traceability - Use appropriate lifting equipment for heavy sections --- **Contact Information** For technical specifications, pricing, or custom bar requirements, please contact our technical sales 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 1912 gallon liquid totes Special package is available on request.