Heat treatment method
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United States of America Patent
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Sep 30, 2014
Grant Date -
Aug 5, 2010
app pub date -
Feb 2, 2009
filing date -
Feb 2, 2009
priority date (Note) -
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Abstract
There is provided a heat treatment method in which high-quality tempering treatment can be performed in a short period of time. In this method, when an object to be treated is tempered after being quenched, the object to be treated is rapidly cooled to a 90% martensite transformation finishing temperature without being cooled to the ordinary temperature after quench heating, and then is subjected to 100% martensite transformation by using a 100° C. liquid, and thereafter, tempering treatment is performed after the whole of the object to be treated is soaked by using the 100° C. liquid.
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