专利检索 ap:("I2C CO., LTD." OR "Tohoku University") AND inv:"Koichi Anzai" 第 1 页

1.

发明授权
Method for producing die-cast product of spheroidal graphite cast iron having ultrafine spheroidal graphite, and die-cast product of spheroidal graphite cast iron 有权

公开(公告)号：US11254993B2

公开(公告)日：2022-02-22

申请号：US15744454

申请日：2016-07-15

申请人： I2C CO., LTD. , Tohoku University

发明人： Haruki Itofuji , Masayuki Itamura , Koichi Anzai , Kazuyoshi Yamaguchi

IPC分类号： C21C1/10 , B22D27/20 , C22C38/04 , C22C38/02 , C22C38/00

摘要： For the purpose of providing a method of die cast product of spheroidal graphite cast iron and a die cast product of spheroidal graphite cast iron having the number of spherical graphites of 3000/mm2 or more in an as cast state, there is disclosed a method of die cast product of ultrafine spheroidal graphite cast iron, including the steps of: a melting step of heating and melting raw materials made of cast iron to obtain source melting metal; a spheroidizing treatment step in which a spheroidizing treatment is performed; an inoculation step of inoculating; and a casting step of casting in a die mold. The amount of nitrogen is adjusted so that the amount of nitrogen generated in the time of melting becomes 0.9 ppm (mass) or less.