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For Pitting Resistance Equivalent number (PREn) , why it's only used for stainless steel (Ferritic/Austenitic/ Duplex) but not to nickel based metal ?

Metallurgy Steel Engineering Civil Engineering
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Question added by MajiD Helal , Mechanical Engineer , SABIC
Date Posted: 2017/04/13
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abdesslem BENATALLAH
by abdesslem BENATALLAH , mechanical engineering , Sonatrach

because of the Cr2O3 chromium oxide passivation layer and a protective layer against corrosion

but nickel-based steel does not have the protective layer

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