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.

Specifications

Inventory

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, AL-6XN® Weld Wire

Common Trade Names

Features

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

Applications

• FGD Scrubbers
• Reverse Osmosis
• Distillation Columns