Fermonic 50 – High Strength / Extra High Strength (UNS S20910 XM-19 Nit50 Nit 50)

Fermonic^® 50 – HS/EHS is a nitrogen-strengthened austenitic stainless steel that can be supplied in the cold worked or warm worked condition (it is also known as Nitronic^® 50 – a trademark owned by AK Steel Corporation). Although very small diameter bars of Fermonic^® 50 (<2.25”) can be cold worked to achieve higher strength levels, larger section sizes can only achieve dramatically increased mechanical properties by deforming at raised temperatures. This results in a deformed and partly recrystallised micro structure that is ‘stress free’, achieves high strengths with good ductility and consistent properties through the bar (unlike cold worked material). The superior properties of Fermonic^® 50 HS/EHS are available up to 9” diameter bars.

This product maintains excellent ductility and toughness at both elevated and cryogenic temperatures, combined with improved abrasion and erosion resistance relative to other austenitic stainless steel grades, making it a useful and cost-effective alloy in a wide range of demanding applications. It can generally be formed and welded in the same way as other 3xx alloys, although machining may require slower speeds / more power due to its high work hardening rate. It achieves corrosion resistance equivalent or better than Alloy 317L in a wide range of environments, and is listed in NACE MR 01 75 for sour service given its ability to resist sulphide stress cracking.