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Molybdenum in Stainless Steels

Molybdenum primarily increases the corrosion resistance of stainless steels .Molybdenum containing grades of stainless steels are generally more corrosion resistant than molybdenum-free grades. hey are used in applications that are more corrosive, such as chemical processing plants or in marine applications.There are many grades of stainless steels with different molybdenum (and chromium, nickel, nitrogen, etc.) contents.The best grade for a given application is selected based on the corrosivity of the service environment.

As a large atom, molybdenum increases the elevated temperature strength of stainless steels through solid solution hardening.  This effect is used in heat exchangers and other elevated temperature equipment such as in automotive exhaust systems.

To discuss the influence of molybdenum on the metallurgy of stainless steels, it is useful to look at the metallurgy of stainless steels in general.  Based on their microstructure, stainless steels are divided into the following families:

austenitic、ferritic、martensitic、duplex and precipitation hardenable.

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