Alloy 800H,Incoloy 800H Bar(Round bar, Flat bar),N08810,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

### **Product Introduction: Alloy 800H / Incoloy 800H Bar (UNS N08810)** **Alloy 800H Bar** (commercially known as **Incoloy 800H Bar** and designated as **UNS N08810**) is a nickel-iron-chromium superalloy supplied in the form of round bars and flat bars (also known as rectangular bars). It is the high-carbon, coarse-grain version of standard Alloy 800, specifically engineered for superior performance in high-temperature environments. The "H" designation signifies its optimized composition for high-temperature service, featuring controlled carbon content (0.05-0.10%) and a specific annealing heat treatment that develops a coarse grain structure. This structure is essential for providing exceptional creep and stress-rupture strength. Round and flat bars of Alloy 800H are fundamental semi-finished products used for machining critical components, fabricating structural supports, and manufacturing fasteners for the most demanding industrial applications. --- ### **Chemical Composition** The chemical composition of Alloy 800H Bar (N08810) is strictly controlled to ensure consistent high-temperature performance. The typical composition ranges are as follows: | Element | Content (%) (Per ASTM B408) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | 30.0 - 35.0 | Imparts austenitic structure and fundamental resistance to oxidation and carburization. | | **Chromium (Cr)** | 19.0 - 23.0 | Confers resistance to oxidation, sulfidation, and other high-temperature corrosives. | | **Iron (Fe)** | ≥ 39.5 | Balance; forms the base of the alloy matrix. | | **Carbon (C)** | 0.05 - 0.10 | **Critical for "H" grade.** Strengthens the alloy at high temperatures via solid solution and carbide formation, directly enhancing creep resistance. | | **Aluminum (Al)** | 0.15 - 0.60 | Combines with Titanium to form strengthening phases and improves oxidation resistance. | | **Titanium (Ti)** | 0.15 - 0.60 | Combines with Aluminum to provide strengthening via gamma-prime formation. | | **Manganese (Mn)** | ≤ 1.50 | Aids in hot workability and combats sulfur embrittlement. | | **Copper (Cu)** | ≤ 0.75 | - | | **Silicon (Si)** | ≤ 1.00 | Improves resistance to oxidation and carburization. | | **Sulfur (S)** | ≤ 0.015 | Impurity, kept low to prevent hot shortness. | *Note: The ratio of (Al + Ti) is typically controlled to be ≥ 0.85% for N08810.* --- ### **Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 0.29 lb/in³ (8.03 g/cm³) | | **Melting Range** | 2470-2520°F (1354-1384°C) | | **Specific Heat** | 0.11 Btu/lb·°F (460 J/kg·K) at 70°F (21°C) | | **Thermal Expansion** | 9.2 x 10⁻⁶ /°F (16.6 x 10⁻⁶ /K) | 70-1200°F (20-650°C) | | **Thermal Conductivity** | 9.0 Btu/hr·ft·°F (15.6 W/m·K) at 70°F (21°C) | | **Electrical Resistivity** | 45.8 μΩ·in (116 μΩ·cm) at 70°F (21°C) | | **Modulus of Elasticity** | 29.1 x 10⁶ psi (201 GPa) at 70°F (21°C) | | **Magnetic Permeability** | Typically < 1.05 (Essentially non-magnetic) | --- ### **Mechanical Properties (Typical for Bar Product)** Mechanical properties for bar products are specified in standards like ASTM B408 for hot-finished or cold-finished bars. The following are typical minimum requirements for the annealed condition. **ASTM B408 - Hot Finished & Cold Finished Bar (Round & Flat)** * **Tensile Strength:** 65 ksi (450 MPa) min * **Yield Strength (0.2% Offset):** 25 ksi (170 MPa) min * **Elongation:** 30% min *The primary value of Alloy 800H bar is its retention of these mechanical properties at elevated temperatures, offering excellent long-term creep and stress-rupture strength up to 1500°F (815°C).* --- ### **International Standards for Bar Product** Alloy 800H / N08810 round and flat bars are covered by several international standards. | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **UNS** | **N08810** | Unified Numbering System designation. | | **ASTM** | **B408 / B408M** | Standard Specification for Nickel-Iron-Chromium Alloy Rod and Bar. | | **ASME** | **SB-408** | Equivalent to ASTM B408, approved for use in ASME Boiler and Pressure Vessel Code construction. | | **EN / DIN** | **1.4958 / 1.4876** | European material numbers (X5NiCrAlTi31-20 / X8NiCrAlTi32-21). 1.4876 is often the direct equivalent. | | **ISO** | **6207** | Designation for wrought products like bar. | --- ### **Product Applications for Bar Forms** The round and flat bar forms of Alloy 800H are foundational materials for manufacturing and fabrication. Key applications include: **Round Bar Applications:** * **Machined Components:** Valve stems, pump shafts, fittings, and flanges for high-temperature service. * **Fasteners:** Machined into high-strength studs, bolts, nuts, and threaded rods for furnace and reactor assemblies. * **Pigtails and Terminals:** Machined from bar stock for connecting reformer tubes to headers in petrochemical furnaces. * **Furnace Rolls:** Used in continuous heat-treating furnaces. * **Shafts and Spindles** for high-temperature equipment. **Flat Bar Applications:** * **Structural Supports & Brackets:** Fabricated into custom hangers, clips, and support systems within boilers, furnaces, and reactors. * **Wear Strips and Guides:** Used in material handling systems within high-temperature zones. * **Fabricated Flanges and Rings:** Rolled or welded into custom components. * **Heat Treatment Fixtures:** Baskets, trays, and grids for holding parts during heat treatment processes. * **Reinforcement and Stiffening** for welded structures. ### **Key Characteristics Summary** * **Superior Creep & Stress-Rupture Strength:** The primary reason for selecting the "H" grade, especially for load-bearing components machined from bar stock. * **Excellent Machinability:** Both round and flat bars are designed to be readily machined into complex parts using standard techniques. * **Outstanding Fabricability:** Can be welded, formed, and fabricated using standard methods, though post-weld heat treatment may be recommended for optimized properties. * **Resistance to Oxidation and Carburization:** Withstands aggressive high-temperature atmospheres. * **Good Structural Stability:** Resists embrittlement from sigma phase formation during long-term exposure. * **Essentially Non-Magnetic.** In conclusion, **Alloy 800H / Incoloy 800H Bar (Round & Flat, UNS N08810)** is a versatile, high-performance material in a form ideal for manufacturing and construction. It is the preferred choice for engineers designing critical components that must retain structural integrity and resist degradation under high mechanical loads and severe thermal conditions.

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 1899 gallon liquid totes Special package is available on request.