公开(公告)号：EP3170911A4

公开(公告)日：2018-01-17

申请号：EP15822754

申请日：2015-07-15

申请人： HITACHI METALS LTD

发明人： KAMIMURA TAKAHIKO ,  HADANO YUUICHI ,  IMAZEKI KENTA ,  OHISHI KATSUHIKO

IPC分类号： C21C7/00 ,  C21C5/52 ,  C21C7/04 ,  C21C7/06 ,  C22B9/20 ,  C22C33/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14

CPC分类号： C21C7/0006 ,  C21C5/5229 ,  C21C7/00 ,  C21C7/04 ,  C21C7/06 ,  C22B9/20 ,  C22C33/04 ,  C22C38/002 ,  C22C38/06 ,  C22C38/105 ,  C22C38/12 ,  C22C38/14

摘要： The invention provides a maraging steel production method in which an oxide is added during an Mg oxide formation step, said production method including: the Mg oxide formation step in which Mg is added to molten steel and MgO is formed in the molten steel, during primary melting; a consumable electrode production step in which, after the Mg oxide formation step, the molten steel is solidified and a consumable electrode having residual MgO is obtained; and a vacuum arc re-melting step in which the consumable electrode is used and vacuum arc re-melting is performed.