The Pitting Resistance Equivalence Number (PREN) is a measure of the corrosion resistance of stainless steels and other alloys. However, it is not commonly used to assess the corrosion resistance of cast iron. The PREN formula is typically applicable to stainless steels that contain specific elements such as chromium, molybdenum, and nitrogen.
Cast iron, including EN-GJL-250, is not usually evaluated using the PREN concept. Instead, different standards and specifications exist to determine the mechanical and metallurgical properties of cast iron. EN-GJL-250 is a European standard for cast iron with a specified tensile strength and chemical composition.
If you require specific information about the corrosion resistance or any other properties of EN-GJL-250, it is recommended to consult the relevant material specifications or reach out to a metallurgical expert or the manufacturer for accurate and detailed information.