| 摘要 |
PURPOSE:To improve machinability by specifying a specific water flow rate in the secondary cooling zone of a continuous casting machine to accelerate the growth of an MnS inclusion. CONSTITUTION:The specific water flow rate in the secondary cooling zone of the continuous casting machine is specified to <=0.5l/kg at the time of producing the free-cutting sulfur steel and the free-cutting sulfur steel formed by adding an element such as lead, bismuth or tellurium to improve the machinability to the free-cutting sulfur steel by a continuous casting process. The particle size of the Mns inclusions in the free-cutting steel is thereby increased and the free-cutting steel having uniform quality and excellent machinability is thus obtd.
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