| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a continuous casting method which can obtain a high-quality cast slab by preventing the bubble defect of a wear-resistant steel containing Ti. <P>SOLUTION: The continuous casting method of wear-resistant steel is characterized as follows. The wear-resistant steel has a composition including 0.05-0.35 mass% of C, 0.05-1.0 mass% of Si, 0.1-2.0 mass% of Mn, 0.0003-0.0030 mass% of B, 0.1-1.0 mass% of Ti, 0.002-0.1 mass% of Al, 0.1-1.0 mass% of Cr, 0.05-1.0 mass% of Mo, 0.05-1.0 mass% of W, and a remainder consisting of Fe and inevitable impurities, the width the cast slab is 1,300-1,900 mm, a casting speed is 0.50-1.00 m/second, in addition, the flow rate M<SB POS="POST">AR</SB>of an Ar gas flow and the flow rate M<SB POS="POST">N2</SB>of an N<SB POS="POST">2</SB>gas flow blown into an immersion nozzle are respectively M<SB POS="POST">AR</SB>: 2.0-14.4 NL/second and M<SB POS="POST">N2</SB>: 0.5-10.8 NL/second, and the continuous casting is performed in the range that the flow rate M<SB POS="POST">AR</SB>of the Ar gas flow and the flow rate M<SB POS="POST">N2</SB>of the N<SB POS="POST">2</SB>gas flow satisfy 2.6≤M<SB POS="POST">AR</SB>+1.2×M<SB POS="POST">N2</SB>≤15.0. <P>COPYRIGHT: (C)2013,JPO&INPIT |
