Questions tagged [metal]

For queries involving the use and selection of metal as part of a crafts project. This includes questions about the cleaning, maintenance, and restoration of metals of all kinds.

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What are these blue spots on a AISI 301 steel plate?

Below is a 150x microscope view of a 301 steel plate. It is covered by this type of small blue spots. It appeared after the steel had been treated at 400°C. The subcontractor thinks that the steel was ...