公开(公告)号：EP1066897A4

公开(公告)日：2004-11-03

申请号：EP99959889

申请日：1999-12-17

申请人： NIPPON STEEL CORP

发明人： TANAKA SHIGENORI ,  HIGASHI TOYOICHIRO ,  DOKI MASAHIRO ,  FUKUDA JUN ,  OHBA HIROSHI ,  UCHIMURA MITSUO

IPC分类号： B22D11/115 ,  B22D11/12 ,  B22D11/00 ,  B22D11/10 ,  B22D11/128

CPC分类号： B22D11/1206 ,  B22D11/115

摘要： A continuous casting billet with a reduced center segregation, especially a high-carbon-steel continuous casting billet and a production method therefor. A continuous casting billet, wherein a branching isometric system diameter at the billet center is set to up to 6 mm. To attain that size, an in-mold electromagnetic agitation is performed to set a primary dendrite tilt angle within 10 mm of a billet surface layer to at least 10 DEG , and a light rolling is conducted during continuous casting to set a center porosity at the billet center to up to 4 mm in diameter; whereby it is possible, when producing a continuous casting billet having a carbon concentration of at least 0.6 mass% and a billet size of up to 160 mm, to provide a billet having a reduced center segregation and being less frequently subjected to wire breakage at wire drawing after wire rolling.