Molybdenum Grade Stainless Steels

 “Stainless Steel” is a generic term covering a large group of iron based, chromium containing alloys.The term “stainless” implies a resistance to staining or rusting in air, which requires a minimum of 10.5% chromium to form a thin, protective chromium enriched oxide layer on the surface of the steel. Without the addition of chromium, iron based alloys or steels will corrode in moist air, forming the familiar red rust.
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There are several different types of stainless steels, which are distinguished by their microstructure.The most important types are austenitic (almost 75% of all stainless steels used in the world), ferritic (about 25%), duplex (about 1%) and martensitic (about 1%) stainless steels.The microstructure of stainless steels is determined primarily by their composition.

Molybdenum is used in all types of stainless steel to improve the corrosion resistance, particularly the pitting and crevice corrosion resistance in chloride containing solutions.