Stress Corrosion Cracking Rates in High Yield Austenitic Alloy Tubing
Cold work in austenitic alloy tubing accelerates stage II stress corrosion crack growth up to 4.5E-7 m/s when stress intensity exceeds critical thresholds.
UNS N08028
Meaning
Highly alloyed austenitic stainless steel provides exceptional resistance to phosphoric and sulfuric acids in industrial processing environments. Engineers specify uns n08028 for use in the production of fertilizers and in the handling of sour gas in the energy sector. The material contains high levels of chromium and nickel, supplemented by molybdenum and copper to enhance its durability against localized attack.
Chemical Composition
Balance of elements in this alloy is designed to maintain a stable face-centered cubic structure even after welding. Because uns n08028 has a high pitting resistance equivalent number, it remains functional in chloride-rich environments that would destroy standard stainless steels.
Corrosion Resistance
Performance of the metal in acidic solutions exceeds that of many other nickel-based alloys due to the protective oxide layer that forms on its surface. Testing in laboratory conditions confirms that uns n08028 resists both intergranular corrosion and stress-assisted cracking.
Industrial Application
Deep-water wells often utilize this material for downhole tubing because it can handle the combined effects of high pressure and hydrogen sulfide. Procurement of uns n08028 involves rigorous quality audits to ensure the chemistry meets the requirements of international standards like iso 15156. Using this alloy reduces the frequency of equipment replacement and lowers the total cost of ownership for a facility.