In this video we discuss Nitrogen Strengthened Austenitic and Duplex Stainless Steels. For the full transcript, click here: https://www.michlinmetals.com/nitrogen-strengthened-austenitic-and-duplex-stainless-steels/ This is the last of our series on the basics of the various types within the family of alloys classified as “stainless steels“. Today we’ll be discussing Nitrogen Strengthened Austenitic and Duplex Stainless Steels  First up is a category that has the austenitic type structure but  these alloys have higher strengths achieved by using Nitrogen and higher levels of Manganese in the chemistry. All these types are non-magnetic. Various grades were developed and made popular with the proprietary name”Nitronic”.  Three of the most popular are Nitronic 40, Nitronic 50 and Nitronic 60.  All have strengths nearly double those of the 300 series in the annealed condition.     Nitronic 40 (aka 21-6-9)  is made in two  variations depending on the carbon content. UNS S21900 has .point 08 % maximum carbon and UNS S21904 is restricted to .point 04 maximum carbon. In ASTM standards, the grades are designated as XM-10 and XM-11. AMS 5656 requires the low carbon version.