The corrosion of high-chromium white cast irons in flue gas desulfurization (FGD) environments is a major concern to pump manufacturers. Fitting resistance equivalent numbers (PREN) are used for stainless steels in these environments, with good success. Calculating a PREN for chromium cast irons containing massive chromium carbides changes the way the percent chromium in the PREN equation is determined. The actual percent of chromium used in the equation was determined, based on chromium in the matrix for a number of chromium cast irons.
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