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  1. fc60

    Austempering With Molten Lead

    Greetings, New to the forum and I have lots of questions. I am working at Austempering 4140 Steel to a final hardness of 40-42 HRC. Material is 0.75" diameter with a 0.313" hole through 6" in length. I heat the part to 1600F and hold for 30 minutes. Next, the part gets quenched in a bath...

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