AL-6XN (UNS N08367/1.4501) is a super austenitic stainless steel pipe designed for extreme chloride-rich environments. Its composition includes high chromium (20.0-22.0%), nickel (23.5-25.5%), molybdenum (6.0-7.0%), and nitrogen (0.18-0.25%), which synergistically enhance resistance to pitting, crevice corrosion, and stress corrosion cracking12. The nitrogen content also increases tensile strength while maintaining ductility and impact resistance, offering 40% higher allowable stress than 316L under ASME standards.
Key Features:
Corrosion Resistance: Excels in high-chloride media (seawater, bleach, halogens) and withstands aggressive environments like FGD systems and offshore platforms.
Mechanical Properties: Combines high strength (≥690 MPa tensile) with good weldability using ERNiCrMo-3 filler metals.
Cost Efficiency: Provides near-equivalent performance to nickel alloys (e.g., C-276) at a lower cos.
Applications:
Chemical processing vessels, heat exchangers, and desalination pumps.
Marine oil/gas infrastructure and seawater-cooled condensers.
Nuclear plant service water systems and paper bleaching equipment.
This alloy’s balanced design makes it ideal for industries requiring durability in corrosive, high-stress conditions without resorting to pricier alternatives.