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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 Form Size Range From Size Range To
AL-6XN® sheet & plate 0.6 mm 76.2 mm
AL-6XN® pipe 0.375 in 20 in
AL-6XN® round bar 9.5 mm 203.2 mm
AL-6XN® coil 0.6 mm 6.35 mm
AL-6XN® pipe fittings 0.5 in 10 in
AL-6XN® flanges 0.5 in 12 in

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    Pipe Fittings

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    Sheet & Plate

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Chemical Analysis

% Cr Ni Mo C N Mn Si P S Cu Fe
MIN 20.00 23.50 6 - 0.18 - - - - - -
MAX 22.00 25.50 7 0.03 0.25 2 1 0.04 0.03 0.75 Balance


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Ideal for applications in the Oil & Gas industry

AL-6XN® can be used in a variety of applications including:

  • 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.

AL-6XN® is the registered trademark of Allegheny Ludlum Corporation.


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

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