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  1. Metals101

    Austempering Core Hardness Problem

    We've been austempering a 1/4" section of 10B21 steel successfully for several years using the following process: Heat to 1650F. Hold 30 minutes. Quench into 480F salt bath. Hold in salt for 2.5 hrs. We normally achieve core hardnesses of 40-46 HRC. Recently we've seen core hardness drop to...

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