XM19 is an alternative description for a more highly alloyed austenitic stainless steel most commonly known as Nitronic 50. The XM19 designation is used in ASTM A182, ASTM A276 and ASTM A479, alongside the unified numbering system caption of UNS S20910. Nitronic 50 is a trademark of AK Steel Corporation.
Nitronic 50 is a higher-performance austenitic stainless steel that provides approximately twice the yield strength of regular 3xx series stainless steels and improved corrosion performance. Like some super duplex stainless steels, it also uses an increased nitrogen content to improve the strength, so is sometimes referred to as a nitrogen-strengthened alloy. Additions of manganese also push up the strength through solid solution strengthening.It is widely used in a variety of marine and industrial applications. Compared with Alloy 316L, it contains increased chromium and molybdenum additions which support the improved corrosion resistance. Whilst Alloy 316L would have a Pitting Resistance Equivalent Number (PREN) of 25, the PREN of Nitronic 50 is 34. It is listed in NACE MR 0175 for sour service applications given its ability to resist sulphide stress cracking.
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