= Pitting resistance equivalent number
{wiki=Pitting_resistance_equivalent_number}
The Pitting Resistance Equivalent Number (PREN) is a numerical value used to assess the resistance of stainless steel and other alloys to pitting corrosion, particularly in environments that are chloride-rich, such as marine settings. Pitting corrosion is localized corrosion that leads to the formation of small holes or pits in the metal. PREN is calculated using the formula: \\\[ \\text\{PREN\} = %Cr + 3.
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