公开(公告)号：US10287668B2

公开(公告)日：2019-05-14

申请号：US14311594

申请日：2014-06-23

申请人： Kyohei Nakayama ,  Yasuaki Sakai ,  Toshiyuki Morita ,  Keisuke Inoue

发明人： Kyohei Nakayama ,  Yasuaki Sakai ,  Toshiyuki Morita ,  Keisuke Inoue

IPC分类号： C23C8/80 ,  C22C38/44 ,  C22C38/60 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/12 ,  C21D1/06 ,  C23C8/22

摘要： Provided is a case hardening steel which allows effective inhibition of abnormal grain growth during carburizing treatment or the like and makes it possible to solve the problem of abnormal grain growth-induced reduction in characteristics. In the case hardening steel, a total amount of TiC, ZrC and AlN which are precipitate particles contained in 100 g of a steel material after subjecting the case hardening steel to hot rolling is 3.5×10−4 mole or less.