AL-6XN® (AL6XN / UNS N08367) Super-Austenitic Stainless Steel

  • 6.3% molybdenum
  • Over 25 years of proven seawater service
  • Practical immunity to chloride stress cracking
  • 50% stronger than stainless
  • ASME coverage up to 800°F
  • Easily welded
  • Available in ALL product forms

AL-6XN® alloy (UNS N08367) is a low carbon, high purity, nitrogen-bearing "super-austenitic" stainless alloy. The AL-6XN alloy was designed to be a seawater resistant material and has since been demonstrated to be resistant to a broad range of very corrosive environments. The high strength and corrosion resistance of the AL6XN alloy make it a better choice than the conventional duplex stainless steels and a cost effective alternative to more expensive nickel-base alloys where excellent formability, weldability, strength and corrosion resistance are essential.

Performance Profile

The levels of chromium, molybdenum and nitrogen in AL-6XN all serve to provide resistance to acidic oxidizing chloride solutions previously achieved only by the nickel base alloys. High nickel (24%) and molybdenum (6.3%) contents make AL-6XN a solution to chloride ion stress corrosion cracking. Because of its nitrogen content, AL-6XN has greater tensile strength than common austenitic stainlesses, while retaining high ductility and impact strength. The ASME allowable stresses for AL-6XN are up to 75% higher than for 316L stainless, and more than twice those for the copper-nickel alloys.


AL-6XN® Concentric Reducers, AL-6XN® Fittings, AL-6XN® Forged Billet, AL-6XN® Pipe, AL-6XN® Plate, AL-6XN® Round Bar, AL-6XN® Sheet, AL-6XN® Stub Ends, AL-6XN® Tees

Common Trade Names

AL6XN, UNS N08367


  • Excellent resistance to pitting and crevice corrosion in chloride solutions
  • Practical immunity to stress corrosion cracking in NaCl environments
  • High strength and toughness


  • AL-6XN FGD Scrubbers FGD Scrubbers
  • AL-6XN Reverse Osmosis Reverse Osmosis
  • AL-6XN Distillation Column Distillation Columns
  • AL-6XN Offshore Oil & Gas Offshore Oil and Gas
  • AL-6XN Heat Exchanger Heat Exchangers