公开(公告)号：US06506270B2

公开(公告)日：2003-01-14

申请号：US09883336

申请日：2001-06-19

申请人： Kenzo Takashina ,  Yuji Komori ,  Kazuaki Tanaka ,  Masahiro Machida

发明人： Kenzo Takashina ,  Yuji Komori ,  Kazuaki Tanaka ,  Masahiro Machida

IPC分类号： C21D604

CPC分类号： C21D6/04 ,  C21D1/18 ,  C21D2211/008

摘要： 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° C./min. to a cooling temperature and holding the cooling temperature for a predetermined period of time.