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Home / R&R Academy / Defect Analysis / Other Defects / Black Stain
Black stain presents as very superficial black spots on a good and smooth casting. This defect indicates that the metal reacted with oxygen forming Chromium (Cr) and Manganese (Mn) oxides during melting, casting and solidification.
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The causes of this defect are evident in the metal and other portions of the process. To cure these causes, R&R recommends taking the following actions.
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