Nitronic 50 offers both higher strength and better corrosion resistance than SS316, so on performance it is the better material. It is more expensive because of its higher alloy content, and availability is lower in product forms other than solid round bar.
How does Nitronic 50 compare to SS316?
Nitronic 50 (Nit50, UNS S20910, DIN 1.3964, ASTM A182 XM19) is widely used for valve bodies and stems. It provides almost double the yield strength of common austenitic grades such as Alloy 304 and Alloy 316L, while keeping excellent ductility and toughness at both elevated and cryogenic temperatures.
Its PREN is above 34, comparable with a duplex stainless steel such as S32205 and far better than the 25 achieved by a regular Alloy 316L. Nitronic 50 is identified as suitable for hydrogen service and is listed in NACE MR0175 for sour service, given its resistance to sulphide stress cracking.
The High Strength condition
Supplied in the High Strength condition, also called Warm Worked or Hot Rolled, Nitronic 50 is almost twice as strong as it is in the solution-annealed condition, and therefore 3-4 times stronger than SS316.
What we stock
We carry Nit50 in both Annealed and High Strength condition as solid round bar up to 10" (254mm) diameter. Nit 60 is stocked in a range of sizes to suit the most common applications.