Paragraph 37 Section 2A: EquipmentF1

stainless steels with 23% chromium or more by weight;

stainless steels and nickel bases alloys with a pitting resistance equivalent number higher than 33.

the “pitting resistance equivalent” (“PRE”) number characterises the corrosion resistance of stainless steels and nickel alloys to pitting or crevice corrosion;

the pitting resistance of stainless steels and nickel alloys is primarily determined by their compositions, primarily: chromium, molybdenum, and nitrogen;