AL-6XN (UNS N08367 / W.Nr. 1.4529)

AL-6XN alloy (UNS N08367 / W.Nr. 1.4529) 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.

Equivalent Grades


Chemical Composition, %


Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A479, ASTM B691, ASTM A194, ASTM B472, ASTM B564
Plate, Sheet and StripASTM A240, ASTM B688
Pipe and TubeASTM A358, ASTM A312, ASTM A409, ASTM A813, ASTM A814, ASTM B690
Welding Product
OthersASTM B366


  • 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 alloy is well suited for such applications as:

  • Chemical process tanks and pipelines
  • Process systems for offshore oil and gas platforms
  • Condensers, heat exchangers and piping containingseawater or crude oil
  • Filter washers, vats and press rolls in pulpbleaching plants
  • Power plant flue gas scrubber environments
  • Tall oil distillation columns and packing
  • Desalination equipment and pumps
  • Service water piping systems for nuclearpower plants
  • Transformer cases exposed to marine environments • Pharmaceutical equipment (for product purity)
  • Food processing equipment