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  1. Sumeet59

    Facing issues (black spots) in core microstructure of case carburized steel

    Hi All, This is my first post so sorry if I have made any mistakes. I am facing issues during case carburizing of universal joint crosses of 20MnCr5 raw material. I am observing black spots in the core microstructure after carburizing. These spots are visible are etching and polishing and also...

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