UNS N08800, N08810, and N08811 are nickel-chromium-iron (Ni-Cr-Fe) alloys widely used in corrosion-resistant and high-temperature applications. These alloys are part of the Incoloy® alloy family, designed for chemical processing, oil & gas, and marine industries. Selecting the correct grade depends on corrosive environment, temperature, and mechanical stress.
Comparison Table: UNS N08800 vs N08810 vs N08811
| Property / Feature | UNS N08800 | UNS N08810 | UNS N08811 |
|---|---|---|---|
| Alloy Type | Ni-Cr-Fe Alloy | Ni-Cr-Fe Alloy | Ni-Cr-Fe Alloy |
| Form | Seamless Pipes & Tubes | Seamless Pipes & Tubes | Seamless Pipes & Tubes |
| Temperature Range | Up to 600°C (1112°F) | Up to 650°C (1202°F) | Up to 675°C (1247°F) |
| Corrosion Resistance | Excellent in oxidizing/reducing acids | Higher resistance to reducing acids and sulfides | Superior resistance to sulfide stress cracking |
| Typical Applications | Chemical processing, heat exchangers | Oil & gas pipelines, chemical reactors | Offshore, chemical, and high-sulfide environments |
| Standards Compliance | UNS N08800 | UNS N08810 | UNS N08811 |
| Mechanical Strength | Medium-High | High | High |
| Common Industries | Chemical, Power | Chemical, Oil & Gas | Chemical, Marine, Oil & Gas |
Chemical Composition Comparison
| Element | UNS N08800 (%) | UNS N08810 (%) | UNS N08811 (%) |
|---|---|---|---|
| Nickel (Ni) | 59–63 | 60–63 | 61–64 |
| Chromium (Cr) | 21–23 | 21–23 | 21–23 |
| Iron (Fe) | 14–17 | 14–17 | 14–17 |
| Molybdenum (Mo) | 0.5–1 | 1–2 | 1–2 |
| Copper (Cu) | 0.5–1 | 0.5–1 | 0.5–1 |
| Carbon (C) | 0.05 max | 0.03 max | 0.03 max |
| Others | Mn, Si, P | Mn, Si, P | Mn, Si, P |
Key Features & Advantages
Excellent Corrosion Resistance: Oxidizing/reducing acids, sulfide stress cracking, and seawater corrosion.
High Temperature Strength: Maintains mechanical stability up to 675°C (1247°F).
Stress-Corrosion Resistant: Ideal for aggressive chemical environments.
Seamless Tubes & Pipes: Can handle high-pressure and high-temperature applications.
Long-Term Reliability: Reduces maintenance and replacement costs in critical industrial setups.
Industrial Applications
Chemical Industry:
Reactors, heat exchangers, evaporators, and piping in sulfuric, hydrochloric, and phosphoric acid environments.
Oil & Gas:
Pipelines for sour gas, H₂S environments, and high-temperature oil transportation.
Marine & Offshore:
Desalination plants, seawater piping, and offshore platforms.
Power Generation:
Tubes and piping in boilers, superheaters, and condensers.
Other Industries:
Pharmaceutical and food processing equipment requiring corrosion resistance and hygiene compliance.
Inspection & Quality Assurance
Chemical Analysis: Spectrometry to verify UNS composition.
Mechanical Testing: Tensile, yield strength, and elongation checks.
Non-Destructive Testing (NDT): Ultrasonic, hydrostatic, and eddy current tests.
Certification: Mill test certificate (MTC) and ISO 9001 compliance.
Export Packaging: Customized for international shipping and handling.
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FAQ
What are UNS N08800, N08810, and N08811 alloys?
They are nickel-chromium-iron (Ni-Cr-Fe) alloys, known for high corrosion resistance and high-temperature performance, widely used in chemical, oil & gas, marine, and power industries.
What is the main difference between these three grades?
N08800: General-purpose corrosion-resistant alloy.
N08810: Improved resistance to reducing acids and sulfides.
N08811: Optimized for sulfide stress cracking, offshore, and high-temperature chemical environments.
Can these alloys handle seawater or marine applications?
Yes. N08811 is particularly suitable for long-term marine exposure, while N08800 and N08810 are also corrosion-resistant in seawater.
Are UNS N08800, N08810, and N08811 available in custom sizes?
Yes, seamless pipes and tubes can be supplied in customized diameters, wall thicknesses, and lengths to meet specific project requirements.
Which industries commonly use these alloys?
Chemical processing, oil & gas, marine, power generation, pharmaceutical, and food processing sectors.
Do these alloys comply with international standards?
Yes, they meet UNS specifications and can be supplied with mill test certificates (MTC) and ISO 9001 compliance.
Are these alloys suitable for high-temperature applications?
Yes.
N08800: Up to 600°C (1112°F)
N08810: Up to 650°C (1202°F)
N08811: Up to 675°C (1247°F)
Can UNS N08800, N08810, and N08811 be welded?
Yes, but welding must follow nickel alloy-specific procedures to maintain corrosion resistance and mechanical integrity.
How long do these alloys last in industrial environments?
With proper selection and maintenance, their service life can range from 15 to 25 years depending on temperature, pressure, and chemical exposure.
How do I choose the right alloy for my project?
Consider operating temperature, corrosive environment, mechanical stress, and sulfide exposure. N08811 is preferred for sulfide-rich or offshore environments, while N08800 is suitable for general chemical applications.
