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  1. J.Godby

    420A SS heat treat and passivation question

    BACK STORY: The blade has been traditionally produced using 420B (.3% carbon). Passivated to ASTM A9767-13, and HEAT TREAT AND DOUBLE TEMPER TO 50-56 Rc. AND CRYOGENIC TREAT TO -90 F OR LOWER FOR 2 HOURS (MIN.) 420A is readily available (.2% carbon). 420B is next to impossible to find...

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