| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a continuous casting method which can achieve refining and uniformization of the solidified structure and solidified secondary structure of a continuously cast slab, and a slab by the continuous casting method. <P>SOLUTION: In the method for continuously casting a slab containing, by mass, 0.03 to 0.20% C, 0.005 to 2.0% Si, 0.2 to 3.5% Mn, ≤0.1% P and ≤0.01% S, and containing one or more kinds of first constituent elements selected from Bi, Sn and Te by 0.0001 to 0.03% in total, and the balance Fe with impurities, rolling reduction is performed right after the central part in the thickness direction of the slab is solidified in such a manner that, in the case the crystal grain size in the center in the thickness direction of the slab is defined as d while the total content of the first constituent elements is less than 0.0001%, and also, the crystal grain size in the center in the thickness direction of the continuously cast slab cast without being subjected to rolling reduction is defined as d<SB POS="POST">0</SB>, the ratio between the d and d<SB POS="POST">0</SB>, d/d<SB POS="POST">0</SB>reaches 0.1 to 0.8. The slab is obtained by using the method. <P>COPYRIGHT: (C)2013,JPO&INPIT |
