公开(公告)号：WO2003002771A1

公开(公告)日：2003-01-09

申请号：PCT/JP2002/006598

申请日：2002-06-28

Applicant: 新日本製鐵株式会社 ,  笹井 勝浩 ,  大橋 渡 ,  松宮 徹 ,  木村 欣晃 ,  中島 潤二

Inventor： 笹井 勝浩 ,  大橋 渡 ,  松宮 徹 ,  木村 欣晃 ,  中島 潤二

IPC: C21C7/00

CPC classification number: C21C7/06 ,  C21C7/0006 ,  C21C7/068

Abstract: A method for casting a molten steel which comprises decarbonizing a raw molten steel to a carbon content of 0.01 mass % or less, subjecting the resultant molten steel to a pre−deoxidation treatment by the addition of Al, to thereby prepare a molten steel having a dissolved oxygen content of 0.01 to 0.04 mass %, and then adding Ti and at least one of La and Ce; and a low carbon steel sheet and a low carbon steel cast piece produced from a molten steel produced by the method. In the steel sheet and cast piece, inclusions are prevented from coagulating and are dispersed in the form of fine particles, which results in preventing the occurrence of flaws on the surface thereof.

Abstract translation: 一种用于铸造钢水的方法，其包括使原始钢水脱碳至0.01质量％以下的碳含量，通过添加Al对所得钢水进行预脱氧处理，由此制备具有 溶解氧含量为0.01〜0.04质量％，然后添加Ti和La和Ce中的至少一种; 以及由该方法制造的钢水制成的低碳钢板和低碳钢铸件。 在钢板和铸件中，防止了夹杂物的凝结，并以微粒的形式分散，从而防止其表面发生瑕疵。