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Pitting

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Pitting presents as random smooth depressions or shallow pits in the casting. This defect indicates that oxygen reacted with the chrome in metal. This reaction is more prevalent with certain metals. 400 stainless series and pH stainless metals may be more prone to this defect. 

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The causes of this defect are evident in the other portion of the process. To cure these causes, R&R recommends taking the following actions.