AL-6XN®

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.