Shortlist nickel alloys for high-temperature, corrosive, chemical, marine and industrial applications based on temperature, corrosion, strength and fabrication requirements.
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| Alloy | Family | Main Characteristics | Typical Applications |
|---|---|---|---|
| Alloy 200 | Commercially pure nickel | Excellent caustic resistance and good corrosion resistance | Chemical processing, caustic service |
| Alloy 400 | Ni-Cu | Excellent seawater and hydrofluoric-acid resistance | Marine, chemical, valves and pumps |
| Alloy 600 | Ni-Cr | Good high-temperature oxidation and corrosion resistance | Furnaces, chemical processing, heat treatment |
| Alloy 625 | Ni-Cr-Mo | High strength and excellent resistance to many corrosive environments | Chemical, marine, aerospace, oil & gas |
| Alloy 718 | Ni-Fe-Cr precipitation hardening | Very high strength at elevated temperatures | Aerospace, turbines, power generation |
| Alloy 800H | Ni-Fe-Cr | High-temperature strength and carburization resistance | Furnaces, petrochemical and process equipment |
| Alloy 825 | Ni-Fe-Cr-Mo-Cu | Strong resistance to acids and stress-corrosion cracking | Chemical processing, pollution control, oil & gas |
| Alloy C-276 | Ni-Cr-Mo | Excellent resistance to severe localized and chemical corrosion | Chemical processing, pollution control |
| Alloy C-22 | Ni-Cr-Mo-W | Very broad resistance to aggressive chemical environments | Chemical processing and pollution control |
| Alloy 230 | Ni-Cr-W-Mo | Excellent high-temperature strength and oxidation resistance | Furnaces, industrial heating and power systems |
What is the best nickel alloy for high-temperature service? The appropriate alloy depends on temperature, atmosphere, required strength and exposure conditions. Alloys such as 600, 625, 718, 800H and 230 serve different high-temperature requirements.
What is Inconel 625 used for? Alloy 625 is commonly selected for high strength combined with excellent resistance to many corrosive environments, including marine, chemical and oil-and-gas service.
What is Inconel 718 used for? Alloy 718 is a precipitation-hardening nickel alloy used where very high mechanical strength is required at elevated temperatures, especially in aerospace and power-generation components.
What is Hastelloy C-276 used for? C-276 is designed for severe chemical environments and is widely considered where resistance to pitting, crevice corrosion and aggressive chemical media is important.
Which nickel alloy is good for seawater? Alloy 400 and Alloy 625 are commonly used in marine environments, with the exact selection depending on temperature, velocity, pollutants and mechanical requirements.
Which nickel alloy is good for chemical processing? Alloys such as 625, 825, C-276 and C-22 can be considered depending on the specific chemical environment. No single nickel alloy is best for every chemical.
Which nickel alloy is easiest to fabricate? Several nickel alloys have good fabrication characteristics, but the exact choice depends on welding, forming, machining and heat-treatment requirements. Corrosion-resistant alloys may require specialized fabrication practices.
What is the difference between Alloy 600 and 625? Alloy 600 is a nickel-chromium alloy commonly used for corrosion and elevated-temperature service, while Alloy 625 contains substantial molybdenum and niobium and provides higher strength and stronger resistance to many localized corrosion mechanisms.
What is Alloy 825 used for? Alloy 825 is commonly used in chemical processing, pollution-control equipment and oil-and-gas applications where resistance to acids and stress-corrosion cracking is important.
Can nickel alloys be welded? Many nickel alloys can be welded, but welding procedure, filler selection, heat input and joint preparation are important because some alloys are sensitive to fabrication-related cracking or property changes.
Can this selector guarantee the correct nickel alloy? No. It provides a preliminary shortlist. Final selection should be verified against actual service chemistry, temperature, pressure, stress, corrosion data and the applicable material specification.