| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide powder for continuous casting and a continuous casting method capable of lessening prediction signal generation of constraint breakout since constraint breakout prediction signals generate frequently when continuously casting Al-Si killed steel in which a Ca content is 15 ppm or more. <P>SOLUTION: The Al-Si killed steel including Ca decreases a heat removal amount from a solidified shell to a mold wall due to generation of bubbles into a powder film during casting and increase of film thickness, or causes large irregularities, and leads to frequent generation of the constraint breakout prediction signals. Thus, OH<SP POS="POST">-</SP>ions in the powder film is reduced into molten steel to increase CaO in the powder, to thereby prevent bubble generation. In other words, the powder for the continuous casting used in the continuous casting of the steel includes 15 ppm or more Ca, 0.1 mass% or more Si, and 0.015 mass% or more and less than 0.035 mass% Al and has basicity B of 1.5 or more. The continuous casting method using the powder is provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
