| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for revealing a solidified shell thickness in an S print capable of inexpensively and rapidly quantitatively grasping the growth form of a solidified shell in recent operation in which a throughput Tp [to/min] is set at≥2.5. SOLUTION: An S chunk 9 is immersed by a prescribed addition amount of M [kg] in a prescribed immersion position and is melted. The weight m [kg] per piece is specified to≥250. In a perpendicular direction of a mold 1, a bottom end 9a of the S chunk 9 is disposed within a range of 50 [mm] in the perpendicular direction from a virtual extension line P of an lower face 5k of molten steel discharge holes 5, 5 of a dipping nozzle 2 in the perpendicular direction of the mold 1. Relating to the amount of addition M [kg] of the S chunk 9, if the sectional area [m<SP>2</SP>] on the mold corner side as an investigation object when viewed from the dipping nozzle 2 further out of the sectional area [m<SP>2</SP>] at a horizontal section at the top end of the mold 1 of the horizontal section of the internal space of the mold 1 is defined as A, the amount is specified within a range where 2.0≤M/A≤3.1 holds. COPYRIGHT: (C)2009,JPO&INPIT
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