Is Nitronic 50 better than SS316?

Nitronic 50 provides both higher strength and improved corrosion resistance when compared with SS316, so would be considered a better product. However, due to its higher alloy content it is more expensive, and availability is lower in product forms other than solid round bar.

Nitronic 50 (Nit50, UNS S20910, DIN 1.3964, ASTM A182 XM19) is widely used in applications such as valve bodies and stems. Nitronic is a trademark of AK Steel Corporation. It provides almost double the yield strength of common austenitic stainless steel grades such as Alloy 304 and Alloy 316L, yet maintains excellent ductility and toughness at both elevated and cryogenic temperatures. The Pitting Resistance Equivalent number (PREN) is above 34 for Nitronic 50, which is comparable with a duplex stainless steel such as S32205, and far better than a regular Alloy 316L grade that achieves 25. Nitronic 50 has been identified as an alloy suitable for hydrogen service and is also listed in NACE MR 01 75 for sour service given its ability to resist sulphide stress cracking.

If supplied in the ‘High Strength’ condition, also referred to as ‘Warm Worked’ or ‘Hot Rolled’, it is almost twice as strong as Nitronic 50 in the solution annealed condition, and therefore 3-4 times stronger than SS316.

Langley Alloys carries stock of Nit50 in both Annealed and High Strength condition as solid round bars up to 10” (254mm diameter). Nit 60 is stocked in a range of sizes to suit the most common applications.

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For more information about our range of alloys, please contact Langley Alloys today.