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A super-austenitic Nickel-Chromium-Molybdenum-Nitrogen stainless steel, AL-6XN® has outstanding corrosion resistance in a wide range of applications.

With many years of proven seawater service and 50% higher strength than stainless steel, AL-6XN® is the alloy of choice in high chloride, seawater and brine applications.


Product FormSize Range FromSize Range To
AL-6XN® sheet & plate0.6 mm82.6 mm GET A QUOTE
AL-6XN® pipe0.5 in16 in GET A QUOTE
AL-6XN® round bar9.5 mm203.2 mm GET A QUOTE
AL-6XN® coil-1 mm GET A QUOTE
AL-6XN® pipe fittings-1 mm GET A QUOTE

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Pipe Fittings

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Sheet & Plate

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Round Bar

Chemical Analysis



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Ideal for applications in the Oil & Gas industry

AL-6XN® can be used in a variety of applications, here are just a few examples:

  • FGD scrubbers
  • Reverse osmosis desalination
  • Distillation columns
  • Heat exchangers
  • Biopharm tanks and fermenters
  • Pressure vessels
  • Manways
  • Agitators and mixers
  • Seawater coolers in nuclear plants

About AL-6XN®

AL-6XN® (UNS N08367) is a 6% Molybdenum, low Carbon, Nitrogen-bearing super-austenitic stainless alloy. The alloy was originally designed for seawater applications. AL-6XN® has also been successfully used in a broad range of very corrosive environments including the rapidly developing biopharm markets.

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 where excellent formability, weldability, strength and corrosion resistance are essential.


8.055 g/cm³
Melting Point:
Electrical Resistivity:
8.89 x 10^ -7 Ω⋅m


UNS Number:
ASTM A182, A240,A249, A276, A312, A479, B462, B472, B564, B675, B676, B688, B690, B691, B366, B804
Download the AL-6XN® Data Sheet Download

FAQs & Resources

Super austenitic stainless grades have a nickel content over 20% compared with the 300 series austenitic stainless grades with a nickel content between 10%-14%. In addition, super austenitic stainless grades have higher levels of Chromium with the addition of Molybdenum.

Excellent resistance to pitting and crevice corrosion attack in chloride solutions combined with high strength and toughness. This is a result of the combination of high Molybdenum content (6.3%) and Nitrogen additions (0.18% - 0.25%).

Pitting corrosion is a localised form of corrosion by which cavities or "holes" are produced in the material. Pitting corrosion is considered more dangerous than uniform corrosion. This is because it is more difficult to detect. Corrosion products often cover the pits. The pit will eventually form a hole through the material leading to catastrophic plant failure.

Crevice corrosion refers to the localised attack on a metal surface at, or immediately adjacent to, the gap or crevice between two joining surfaces. The gap or crevice can be formed between two metals or a metal and non-metallic material.

AL-6XN® with a Nickel content of 24% demonstrates good resistance to Chloride ion induced stress corrosion cracking and is practically immune to stress corrosion cracking in Sodium Chloride (Seawater and Saline) environments.

Request a Quote

Fill in our online form to get a fast quote. Got a technical question? Contact us on techsales@neonickel.com or for more general enquiries please email us at enquiries@neonickel.com