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  1. jjimjjones

    4140 heat treating variation in rc

    We had 7/8" dia bar 4140h heat treated, 41-50 rc. the vendor could not get a consistent rc reading on the outside ,30-54. Why would this be. Also we machined some parts and got 41-54 rc readings. Why would this be? The vendor has also tried re-heat treating the bars with the same result on the...

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