Inconel 800 pipe
Inconel 800 Pipe is a commonly searched commercial term for piping made from Alloy 800, a nickel-iron-chromium alloy formally designated as INCOLOY® alloy 800. Although both names are used in procurement, buyers should specify UNS N08800 and the applicable standard (ASTM B407 / ASME SB407) to ensure the correct material is supplied.
Alloy 800 (UNS N08800) offers excellent resistance to oxidation, carburization and nitridation at elevated temperatures, along with useful mechanical strength and fabrication characteristics. It is selected for petrochemical, chemical-processing, heat-treatment, furnace, power-generation and high-temperature industrial applications.
Whether you refer to it as Inconel 800 pipe or Incoloy 800 pipe, the technical specification remains the same: nickel-iron-chromium alloy, UNS N08800, complying with ASTM B407 or ASME SB407.
What Is Inconel 800 Pipe?
Inconel 800 Pipe is a widely used commercial search term for Alloy 800 pipe — a nickel-iron-chromium alloy with controlled additions of carbon, aluminium and titanium. The formal trade name for this alloy is INCOLOY® alloy 800 rather than an Inconel grade, but both names are used interchangeably in industry.
The alloy is known for:
- Good oxidation resistance at elevated temperatures
- Resistance to carburization in suitable environments
- Resistance to nitridation in appropriate conditions
- Good elevated-temperature mechanical performance
- Useful creep and rupture characteristics
- Good resistance to many industrial environments
- Good fabrication and welding characteristics when suitable procedures are followed
The actual suitability of Alloy 800 depends on operating temperature, atmosphere, stress level, chemical environment and required material condition. Always specify UNS N08800 in your technical enquiry to avoid confusion.
Key Properties of Alloy 800 Pipe
1. High-Temperature Oxidation Resistance
The chromium content contributes to oxidation resistance, making Alloy 800 suitable for selected elevated-temperature environments up to approximately 1100°C.
2. Resistance to Carburization
Alloy 800 can be considered for environments where carburization is a concern, subject to the actual temperature and atmosphere present.
3. Resistance to Nitridation
The alloy can provide resistance to nitridation in appropriate high-temperature environments, making it suitable for nitrogen-bearing atmospheres.
4. Elevated-Temperature Strength
Alloy 800 provides useful mechanical performance at elevated temperatures and can be considered for selected thermal-processing applications requiring creep resistance.
5. Fabrication
The alloy can be formed, machined and welded using suitable procedures, making it versatile for custom piping fabrication.
6. Corrosion Resistance
Alloy 800 provides resistance to various corrosive environments, although its suitability depends on the particular chemical medium and operating conditions.
Seamless Alloy 800 Pipe
Seamless Alloy 800 Pipe is manufactured without a longitudinal welded seam, making it ideal where seamless construction is required by the applicable specification or engineering design.
Potential considerations include:
- No longitudinal weld seam
- Suitable for specified pressure applications
- Availability in engineered dimensions
- Use in selected high-temperature process systems
The actual suitability depends on the applicable product standard and service conditions. Seamless Inconel 800 pipe is commonly specified to ASTM B407.
Welded Alloy 800 Pipe
Welded Alloy 800 pipe is produced by forming alloy material and joining it using an appropriate welding process. It may be considered where permitted by the applicable specification and project design.
Important considerations include:
- Welding procedure qualification
- Weld quality and inspection
- Post-weld heat treatment
- NDT requirements
- Dimensional tolerances
- Applicable material specification
Inconel 800 Pipe Applications
Alloy 800 pipe (commonly called Inconel 800 pipe) is used in applications involving elevated temperatures and demanding industrial environments.
Petrochemical Processing
Used in selected petrochemical process equipment and piping where resistance to high-temperature environments is required.
Chemical Processing
Alloy 800 may be considered for chemical-processing applications where its corrosion and temperature characteristics are appropriate.
Heat Treatment Equipment
The alloy can be used in selected thermal-processing and heat-treatment equipment where sustained elevated-temperature exposure occurs.
Furnace Equipment
Its oxidation and high-temperature characteristics make it suitable for certain furnace-related components and radiant tubes.
Power Generation
Alloy 800 is used in selected power-generation applications involving elevated temperatures, including steam reformer piping.
Heat Exchangers
The alloy can be considered for selected heat-transfer applications where its material properties meet the design requirements.
Industrial Heating Systems
It may be used in specialized industrial heating and thermal-processing systems where resistance to oxidizing and carburizing atmospheres is required.
High-Temperature Process Equipment
Alloy 800 can be considered for components exposed to elevated temperatures and controlled industrial atmospheres such as ammonia reformers.
How to Select Inconel 800 Pipe
Before ordering Inconel 800 / Alloy 800 pipe, consider the following:
- Operating Temperature
Identify normal, minimum and maximum operating temperatures to confirm Alloy 800 is suitable for your application.
- Process Atmosphere
Determine whether the pipe will encounter oxidizing, carburizing, nitriding or other controlled atmospheres.
- Process Medium
Identify the chemicals, gases or liquids in contact with the pipe.
- Pressure
Specify operating and design pressure requirements.
- Pipe Dimensions
Provide NPS, OD, wall thickness or schedule and required length.
- Manufacturing Method
Determine whether seamless or welded construction is required by the project specification.
- Grade Clarification
Clearly specify Alloy 800 / UNS N08800 to avoid confusion with Alloy 800H (N08810) or Alloy 800HT (N08811).
- Applicable Standard
Specify the required ASTM B407, ASME SB407 or project-specific standard.
- Testing and Inspection
Identify required mechanical testing, NDT, PMI, dimensional inspection and other requirements.
- Documentation
For critical applications, specify MTC, traceability and inspection documentation requirements.
Quality Checks for Inconel 800 Pipe
A suitable quality-control process may include:
- Chemical composition verification
- Mechanical property testing
- Dimensional inspection
- Surface examination
- Heat-treatment verification where applicable
- Non-destructive testing where specified
- PMI verification
- Heat/lot traceability
- MTC review (EN 10204 3.1 or 3.2 as required)
- Third-party inspection where required
The exact testing requirements should follow the applicable product specification and purchase order.
Inconel 800 Pipe Price
The price of Inconel 800 / Alloy 800 pipe depends on the complete product specification. As a nickel-based alloy, it is generally priced higher than standard austenitic stainless steel grades.
Factors affecting price may include:
- Pipe size (NPS / OD)
- Wall thickness
- Schedule
- Length
- Seamless or welded construction
- Quantity ordered
- Material condition (annealed, cold-drawn etc.)
- Applicable specification
- Testing requirements
- Inspection requirements
- Documentation (MTC grade)
- Packaging requirements
- Delivery location
- Nickel and alloying-metal market conditions
For an accurate quotation, provide the complete material and dimensional requirements. Contact us with your enquiry and we will respond within 24 hours.
Frequently Asked Questions About Inconel 800 Pipe
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