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  1. jjimjjones

    4140 heat treating variation in rc

    The rc testing was performed by the heat treater and our selves. Thank you to all. I will keep you posted. Jim
  2. jjimjjones

    4140 heat treating variation in rc

    Is this material salvagable, How would we get the correct rc reading from each bar, 4 ft lengths? Would the decarb need to be removed? Is there anyone who has ran across this problem? How was it resolved? Thanks, Jim
  3. jjimjjones

    4140 heat treating variation in rc

    Could you go into more detail about decarburization & method of hardness testing and a solution. How thick would the decarb be ? How could the decarb be removed? Have you seen this problem before? It has us scratching our heads. We though we just send the bars out for ht get them back certified...
  4. 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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