AL6XN®UNS N08367

AL6XN® 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 broadrange of very corrosive environments. The high strength and corrosion resistance of the AL-6XN® alloy make it a better choice than the conventional duplex stainless steels and a cost effective alternative to more expensive nickel-base alloys in applications where excellent formability, weldability, strength and corrosion resistance are essential. It is also a cost-effective alternative to less expensive alloys, such as Type 316, that do not have the strength or corrosion resistance required to minimize life cycle costs in certain applications.The high nickel and molybdenum contents provide improved resistance to chloride stress-corrosion cracking. Copper (Cu) has been intentionally kept to a residual level for improved performance in seawater 40.The high alloy composition of the AL6XN® alloy resists crevice corrosion and pitting in oxidizing chloride solutions to a degree previously achieved only by nickel-base alloys and titanium.


seamless-pipe Seamless Tubes

welded-pipe Welded Tubes
plate Plates
bar Bars  stock
flanges Flanges  stock
accessories Fittings


  • 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
  • Food processing equipment

General characteristics

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

Technical information



AL6XN® – UNS N08367
Products Norm ASTM
Seamless Tubes B-690 B-629
Welded Tubes  
Bars A-276 A-479 B-691
Flanges A-182 B-462 B-564
Fittings A-815 A-988

Chemical specifications %


AL6XN® – UNS N08367
Element Simbol Maximum %
Carbon C 0,030
Manganese Mn 2,00
Phosphorus P 0,040
Sulfur S 0,030
Silicon Si 1,00
Nickel Ni 23,5-25,5
Chrome Cr 20,0-22,0
Molybdenum Mo 6,00-7,00
Nitrogen N 0,18-0,25
Copper Cu 0,75
Iron Fe Balance

Mechanical Properties

AL6XN® – UNS N08367
Norm Rm min. Rp 0,2% min. E4d min.% Z min.% T.I.(J) HR B HB
A-479 95 (655) 45 (310) 30 241
B-462 95 (655) 45 (310) 30
B-564 95 (655) 45 (310) 30
B-690 95 (655) 45 (310) 30
B-691 95 (655) 45 (310) 30