Calculation of PREN
Pitting resistance equivalent numbers (PREN) are a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels, based on their chemical compositions.
Durability and life expectancy for stainless steels in external environments
The most important corrosion consideration with stainless steels is pitting.
Micro pitting is manifested as surface rust staining and is generally considered unacceptable for a material basically selected for its aesthetic appearance and corrosion resistance.
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