Hastelloy C-276 (UNS N10276) Nickel Alloy: Properties and Applications
# Hastelloy C-276 (UNS N10276) Nickel Alloy: Properties and Applications
## Introduction to Hastelloy C-276
Hastelloy C-276, also known by its UNS designation N10276, is a nickel-based superalloy renowned for its exceptional corrosion resistance in harsh environments. This alloy belongs to the Hastelloy family of materials developed by Haynes International and has become a standard choice for demanding industrial applications.
## Chemical Composition
The outstanding performance of Hastelloy C-276 stems from its carefully balanced chemical composition:
- Nickel (Ni): 57% (minimum)
- Molybdenum (Mo): 15-17%
- Chromium (Cr): 14.5-16.5%
- Iron (Fe): 4-7%
- Tungsten (W): 3-4.5%
- Cobalt (Co): 2.5% (maximum)
Keyword: HastelloyX C-276 UNS N10276
Key Properties of Hastelloy C-276
Hastelloy C-276 exhibits several remarkable properties that make it suitable for challenging applications:
- Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking
- Outstanding resistance to a wide range of oxidizing and reducing media
- Good thermal stability and mechanical properties at elevated temperatures
- Superior resistance to chloride-induced stress corrosion cracking
- Maintains corrosion resistance in welded conditions
## Applications of Hastelloy C-276
Chemical Processing Industry
Hastelloy C-276 finds extensive use in chemical processing equipment such as reactors, heat exchangers, and piping systems. Its resistance to sulfuric, hydrochloric, and phosphoric acids makes it invaluable in this sector.
Pollution Control Systems
The alloy’s resistance to flue gas desulfurization environments has made it a preferred material for scrubbers, ducting, and stack liners in power plants and industrial facilities.
Pharmaceutical Industry
In pharmaceutical manufacturing, Hastelloy C-276 is used for equipment requiring high purity and resistance to corrosive cleaning agents and process chemicals.
Marine Applications
The alloy’s excellent resistance to seawater and marine atmospheres makes it suitable for offshore platforms, seawater piping systems, and other marine components.
## Comparison with Other Nickel Alloys
While Hastelloy X (UNS N06002) offers superior high-temperature strength, Hastelloy C-276 provides better corrosion resistance in reducing environments. The choice between these alloys depends on the specific application requirements.
## Fabrication Considerations
Hastelloy C-276 can be readily fabricated using standard techniques, though it requires more power than stainless steels due to its higher strength. Proper heat treatment and welding procedures are essential to maintain its corrosion-resistant properties.
## Conclusion
Hastelloy C-276 (UNS N10276) remains one of the most versatile nickel-based alloys for corrosive environments. Its combination of excellent corrosion resistance, good mechanical properties, and fabricability ensures its continued use across multiple industries where material reliability is critical.
