Incoloy 800/UNS N08800/W.Nr. 1.4876/Alloy 800 bar

Incoloy 800 bar, also known as Alloy 800, UNS N08800, and W.Nr. 1.4876, is a nickel-iron-chromium austenitic alloy designed for excellent strength and resistance to oxidation, carburization, and sulfidation at high temperatures. This bar stock form is a widely used material for machining components in industrial heating, heat-treating, petrochemical processing, and power generation applications where service temperatures range from 540°C to 1100°C (1000°F to 2000°F). Its balanced composition provides good metallurgical stability under prolonged thermal exposure.

Introduction to Incoloy 800 (Alloy 800)

Incoloy 800 is a solid-solution strengthened alloy that offers a cost-effective balance of high-temperature performance and corrosion resistance. Its nickel content provides resistance to scaling and carburization, while chromium imparts oxidation resistance. The alloy is stabilized with titanium and aluminum to prevent sensitization and control grain growth. The bar stock is commonly used for furnace components, heat exchanger tubing, and process piping in demanding thermal and chemical environments.

Chemical Composition of Incoloy 800 Bar

The high-temperature properties of Incoloy 800 bar are derived from its stable chemical composition. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock conforms to standard specifications ensuring consistent quality.

Mechanical Properties of Incoloy 800 Bar

Incoloy 800 bar maintains useful mechanical strength at elevated temperatures and offers good ductility. It is typically supplied in the solution-annealed condition.

Typical Value at 650°C (1200°F)

Physical Properties of Incoloy 800 Bar

The physical properties of Alloy 800 bar are important for thermal design in high-temperature systems.

Notes / Condition

Standard Specifications, Bar Forms, and Available Sizes

Shanghai NC Metal Materials Co., Ltd. supplies Incoloy 800 bar in various forms suitable for high-temperature fabrication.

Primary Applications of Incoloy 800 Bar Stock

Machined or forged components from Incoloy 800 bar are used in various high-temperature processes: Heat Treatment Industry: Radiant tubes, retorts, baskets, and fixtures for carburizing, annealing, and sintering furnaces. Petrochemical & Chemical Processing: Heater tubes, reformer tubes, and heat exchanger tubing in ethylene and steam methane reforming units. Power Generation: Superheater and reheater tubing, steam generator tubing in conventional and nuclear power plants. Industrial Heating: Heating element sheathing, thermowells, and furnace rolls.

Corrosion and High-Temperature Resistance

Incoloy 800 provides good resistance to oxidation up to approximately 1100°C (2000°F) in continuous service. Its nickel content offers resistance to carburization and nitrogen pickup (nitriding) in furnace atmospheres. It shows good resistance to sulfidation and chloride-induced stress corrosion cracking at elevated temperatures. While not designed for severe wet corrosion service, it performs well in many high-temperature corrosive gases and aqueous environments at moderate temperatures.

Machining and Fabrication of Incoloy 800 Bar

Incoloy 800 bar is readily machinable using standard techniques for austenitic alloys. Recommendations include: using rigid setups and sharp carbide tools; moderate cutting speeds; positive feed rates; and adequate coolant to control work hardening and heat. Its machinability is similar to that of Type 304/316 stainless steel, making it a practical choice for fabricating complex high-temperature components.

Welding of Incoloy 800 Bar

Alloy 800 is considered weldable by common processes such as Gas Tungsten Arc Welding (GTAW/TIG), Shielded Metal Arc Welding (SMAW/Stick), and Gas Metal Arc Welding (GMAW/MIG). Matching filler metals (e.g., ERNiCr-3) are typically used. Due to its titanium and aluminum stabilization, it is resistant to sensitization. For service in corrosive environments or under high stress, a post-weld solution anneal is recommended to restore optimal corrosion resistance and ductility in the heat-affected zone.

Reference Pricing and Key Purchasing Factors

The price of Incoloy 800 bar from Shanghai NC Metal Materials Co., Ltd. is influenced by its nickel content and its widespread use as a standard high-temperature alloy.