High-temperature industrial equipment places unique demands on engineering materials. Furnace components, heat exchangers, petrochemical equipment, and thermal-processing systems may operate continuously at elevated temperatures while being exposed to oxidation, carburization, thermal cycling, and mechanical stress.

Incoloy 800, also known as Alloy 800 and UNS N08800, is a nickel-iron-chromium alloy developed for high-temperature service and corrosion-resistant applications.

Its combination of nickel, chromium, and iron provides useful resistance to oxidation and carburization while maintaining good structural stability at elevated temperatures.

What Is Incoloy 800?

Incoloy 800 is a nickel-iron-chromium alloy commonly identified as:

• Incoloy 800
• Alloy 800
• UNS N08800
• W.Nr. 1.4876

The alloy is designed for applications where elevated-temperature strength, oxidation resistance, and resistance to carburization are important.

It occupies an important position between conventional heat-resistant stainless steels and more specialized nickel-based superalloys.

Why Is Incoloy 800 Used in High-Temperature Equipment?

Industrial furnaces and thermal-processing systems can expose materials to temperatures far above those used in conventional equipment.

At elevated temperature, engineers must consider:

• Oxidation
• Carburization
• Thermal expansion
• Creep
• Metallurgical stability
• Mechanical strength
• Fabrication requirements

Incoloy 800 is designed to address several of these challenges.

Incoloy 800 in Industrial Furnace Applications

Industrial furnaces can contain heating elements, radiant tubes, supports, baskets, trays, and other components exposed to heat for extended periods.

Depending on the furnace design and operating environment, Incoloy 800 may be considered for:

• Furnace components
• Heating equipment
• Radiant tubes
• Heat-treatment equipment
• Process tubing
• Industrial furnace fixtures
• Petrochemical processing components

The actual suitability depends on temperature, atmosphere, mechanical loading, and component geometry.

Incoloy 800 and Oxidation Resistance

At elevated temperature, oxidation can progressively degrade metallic materials.

Chromium contributes to the formation of a protective oxide layer that helps slow further oxidation.

This characteristic is particularly important in furnace and thermal-processing applications where components remain exposed to hot gases for long periods.

Carburization Resistance

Carburization occurs when carbon diffuses into a metal under certain high-temperature environments.

This can change the microstructure and mechanical behavior of the material.

For industrial processing equipment exposed to carbon-rich atmospheres, resistance to carburization can be an important material-selection factor.

Incoloy 800 is commonly considered in applications where resistance to carburization is required.

Incoloy 800 for Heat Exchangers

Heat exchangers operate by transferring heat between different fluids.

Depending on the application, the tubes may encounter:

• Elevated temperatures
• Steam
• Hydrocarbons
• Combustion gases
• Process chemicals
• Thermal cycling

Incoloy 800 can be considered for heat-transfer components when elevated-temperature corrosion resistance and structural stability are required.

Petrochemical Applications

Petrochemical processing plants contain numerous high-temperature systems.

Typical equipment may include:

• Process heaters
• Furnace tubes
• Reforming equipment
• Heat exchangers
• Piping components
• Process vessels

Material selection depends heavily on process chemistry and operating temperature.

Incoloy 800 may be suitable for selected applications where its high-temperature corrosion resistance and metallurgical characteristics meet the design requirements.

Incoloy 800 Product Forms

Alloysfactory lists Incoloy 800 / Alloy 800 / UNS N08800 among its nickel-based alloy products.

Depending on project requirements, industrial buyers may request:

• Pipe
• Tube
• Sheet
• Plate
• Bar
• Rod
• Strip
• Wire
• Rings
• Custom components

The correct product form depends on the final manufacturing process.

Incoloy 800, 800H and 800HT

The Incoloy 800 family includes several grades developed for different high-temperature requirements.

For material selection, engineers should distinguish between:

• Alloy 800
• Alloy 800H
• Alloy 800HT

The differences relate to composition, processing, grain structure, and high-temperature mechanical performance.

For applications involving significant creep or rupture requirements at elevated temperatures, the H and HT variants may be considered instead of standard Alloy 800.

Therefore, purchasing teams should confirm the exact grade required by the engineering specification.

How to Purchase Incoloy 800

A professional purchasing request should include:

Material: Incoloy 800
UNS: N08800
Product: Tube / Pipe / Sheet / Plate / Bar
Dimensions: Complete dimensions
Quantity: Required quantity
Standard: Applicable specification
Heat treatment: Required condition
Surface: Required surface condition
Testing: Required inspection
Certificate: Required documentation

For high-temperature projects, the operating temperature and atmosphere should also be communicated to the supplier.

What Makes a Good Incoloy 800 Supplier?

When sourcing Incoloy 800 internationally, buyers should evaluate more than the quoted price.

Important factors include:

Material Traceability

Every production batch should have clear traceability.

Chemical Composition

The supplier should provide test results confirming the required chemical composition.

Mechanical Testing

Mechanical properties should be verified according to the applicable specification.

Dimensional Control

Tubing, sheet, plate, and bar products should meet the required tolerances.

Inspection Capability

For critical projects, buyers may require additional NDT or third-party inspection.

Custom Manufacturing

A supplier capable of producing non-standard dimensions can reduce additional machining and fabrication work.

Frequently Asked Questions

What is Incoloy 800?

Incoloy 800 is a nickel-iron-chromium alloy identified as UNS N08800 and W.Nr. 1.4876.

What is Incoloy 800 used for?

It is used in high-temperature equipment, industrial furnaces, heat exchangers, petrochemical processing, heating systems, and selected thermal-processing components.

Can Incoloy 800 be used in furnaces?

Yes. It is commonly considered for furnace and heat-treatment components where elevated-temperature oxidation resistance and structural stability are required.

What is the difference between Incoloy 800 and 800H?

Alloy 800H is a related grade developed with high-temperature mechanical performance considerations that differ from standard Alloy 800. The correct grade should be selected according to the applicable design specification.

What information is required for an Incoloy 800 quotation?

Provide grade, UNS number, product form, dimensions, quantity, applicable standard, heat-treatment condition, surface requirements, testing requirements, and delivery requirements.

Conclusion

Incoloy 800 is a practical nickel-iron-chromium alloy for many elevated-temperature industrial applications.

Its resistance to oxidation and carburization, combined with useful high-temperature mechanical characteristics, makes it relevant to industrial furnaces, heat-treatment equipment, heat exchangers, petrochemical processing, and thermal-processing systems.

The most important purchasing decision is to select the correct grade and product condition for the actual service environment.

Contact Alloysfactory

Danyang Jiaxin New Materials Technology Co., Ltd. supplies Incoloy alloys, Inconel alloys, Hastelloy alloys, Monel alloys, Nimonic alloys, precision alloys, cobalt-based alloys, and related welding materials.

Website: https://www.alloysfactory.com/
Email: sales@alloysfactory.com
Phone / WhatsApp: +86 18052778977
Address: Room 412, Building 10, Fuqian Xingzuo Garden, Development Zone, Danyang City, Jiangsu Province, China

Contact Alloysfactory for Incoloy 800 tubes, pipes, sheets, plates, bars, strips, and customized high-temperature alloy products.