Molybdenum improve pitting corrosion of stainless steel
08 May 2020
The most common application of molybdenum is in the production of stainless steels and nickel-based alloys. Molybdenum is widely understood to improve the resistance to pitting corrosion of stainless steels and therefore is a key alloying element in their composition. Duplex, super duplex, and austenitic stainless steels within Langley Alloys stock range all utilize molybdenum.
Austenitic stainless steels such as Alloy 316L contains around 2% molybdenum. By adding molybdenum, there is an appreciable improvement in resistance to pitting corrosion, Nitronic 50 is a highly-alloyed austenitic stainless steel. It has excellent impact strength toughness and ease of fabrication, and Alloy 254 with a 6% content. It will be used in very aggressive applications.
Duplex stainless steels such as 2205 duplex uses 3.0-3.5% molybdenum, and Lean duplex grades such as Alloy 2304 have negligible molybdenum content in order to help reduce their cost.
Super duplex grades including Ferralium 255, SAF2507 and S32760, all contain around 3.0% molybdenum.
A large number of nickel-based alloys all contain around 3.0% molybdenum, to enhance pitting corrosion resistance.
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