Heat treatment method of steel
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United States of America Patent
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Jan 14, 2003
Grant Date -
Feb 14, 2002
app pub date -
Jun 19, 2001
filing date -
Jun 21, 2000
priority date (Note) -
Expired
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Abstract
A heat treatment method of steel is capable of enhancing wear resistance, mechanical properties and dimensional stability of the steel due to the reduction of the retained austenite amount to substantially zero. In the method, an article of the steel is subjected to a quenching and then subzero treatment including cooling it at a cooling rate of 1 to 10.degree. C./min. to a cooling temperature and holding the cooling temperature for a predetermined period of time.
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